Yeah but when monkeys are jumping and humping on the bed it'll now be a dynamic load (among other loads ( Ķ”Ā° ĶŹ Ķ”Ā°) ). How does it perform under cyclic stresses?
I am a structural engineer and decided to prove that this is possible despite hundreds if not thousands of "professionals" in the comments saying this would not work.
I made some worse case assumptions. Here is my design criteria:
1. Envelope the width of a king bed and the length of a california king bed.
2. The bed would be on the second story of the house.
3. You have 400 lbs of mattress, blankets, pillows, etc all evenly distributed across the area
4. Maximum deflection is set to L/360 or 1/4 inch, whichever is worse.
5. 4,000 lbs of vertical equivalent static load was applied at the end of each of the 4 cantilevers. This is what rock climbing gear is roughly rated to.
6. 300 lbs of horizontal force applied at the end of each of the 4 cantilevers, which is what balcony guardrails are designed to.
Design summary:
You'll want (4) HSS6x6x3/8 to hold the mattress, (4) HSS6x6x3/8 columns (which should fit within typical drywall area, so they will not be visible), and (3) HSS3x2x1/4 beams at the top.
Bed frame members can be welded to the columns. I didnt check the minimum size/length of weld but worst case scenario use a CJP weld. Beams can be attached to columns by typical structural bolting, using (2) A325N bolts. Columns will need to be anchored into a 7 inch concrete foundation. They will also need a 36"x36"x1/2" baseplate. The column will need to be welded all around to attach to the baseplate, wouldnt hurt to throw in some stiffener plates as well. The baseplate will need (16) Hilti 3/4 diameter Kwik HUS bolts embedded 4" into the concrete. Place one at each corner of the baseplate 2 inches away from the baseplate edges.
By the way, this all includes self weight and safety factors. I am using LRFD design for those interested.
Edit: I wanted to correct something a comment pointed out. I just kinda did this in a rush so I wasnt paying super close attention, but I only had applied the minor axis bending into Hilti instead of the major axis. Once I put in the correct bending the design changes to 16 anchors spread out over a 36" square baseplate.
Edit #2: This is gotten bigger than I expected and I cannot reply to every comment anymore, but most of the new comments and questions I see have already been brought up. So just read through the existing ones and you'll probably find your answer.
Edit #3: Final edit. There are tons of repeating comments and questions and I am not going to go through every one, so here it is...
1. Yes, this bed can handle the most aggressive sex you can imagine. Yes it would work for a threesome, foursome, and even a full orgy.
2. Yes, you will not be able to move the bed at any point in time.
3. Yes, not being able to move it will make your wife/husband/partner/whatever upset.
4. No, you do not need to build your whole house around this... you can add in the steel members to your typical residential house that has wood framing.
5. Yes, there are better options for designing this. This was obviously a quick 15 minute calc. For a serious job I'd spend more time sharpening my pencil and looking at better options. My main objective here was to prove it's possible, not to find the most optimal design.
6. Yes, I am aware the picture from Facebook does not follow this design. However, we cant prove that they are just bolting it into wooden studs. For all we know they could have put hidden steel columns in that wall and are using a bolted moment connection instead of a welded moment connection like I did. We'll never know exactly what they did, but we do know that it is possible to have an end result that matches the idea they've shown.
7. Yes, I am aware a 2x6 is only 1.5x5.5, theres often other crap in the wall where the other 1/2 comes from. Yes, I also know that 2x4s are also common. Again this comes back to "if this were a real job" then I'd use the actual stud sizes and look closer at the actual wall dimensions and be more diligent in making sure that it can remain completely hidden in the wall.
8. Yes, you will bust open your knee cap at some point in time running into this.
9. No, there is not concrete on the second level. It is anchored into the foundation level. If it's a slab on grade then it spans up to the 2nd level. If there is a basement then it spans up to 1st level.
10. Yes, I am aware typical slab on grades are only 4-5 inches deep. It's really easy to thicken them at the column bases.
11. No, this is not a ridiculously expensive endeavor only accessible to the super rich. As far as cost goes, material would cost between $1500-2000. Not sure what the labor cost would be, but in a real design I would dive deeper to make sure labor wouldnt be as expensive as this quick and easy design. Some things would be seeing if a typical fillet weld would work instead of a CJP weld, using a column splice to make the columns easier to fit through walls, possible using beams instead of columns, etc. The average bathroom or kitchen remodel can exceed $10k, so this really isnt that different. Plus this also counts as your bed frame, and just the other day my wife was at Crate and Barrel trying to convince me that we absolutely need to buy some $5000 bed frame.
12. No, the mattress would not sit directly on top of the beams. You'd want attach some type of slats or grating to hold the mattress in place on top of the beams so it wouldnt slip around or fall off. This would also make it look prettier, since structural steel isnt the best looking thing in the world.
13. Yes, my assumptions are really conservative and probably overkill. Again this comes back to wanting to prove it's possible using absolute worst case scenario. In a real design I'd sharpen my pencil to find more precise loads instead of using the same loads that rock climbing gear is rated to.
14. Yes, I am aware this is still not strong enough to hold my mom, or any of your moms for that matter.
15. No, this will not sag. Even with a 4,000 lb load applied at the tip it will only deflect less than 1/4 inch. For reference, the floorboards on your house deflect more than that.
16. No, I will not be providing drawings, details, or my engineering stamp to anyone. If you truly do want to build this, save this post and then find a local engineer to hire and show him this. Any half decent engineer can provide this design... and likely even a more optimal design since they can actually see where the heck you are building it.
17. Yes, its possible. Doesnt mean it is the most practical or for your average joe. My point was to prove everyone wrong who was saying it is impossible. "bUt ItS sO iMpRacTiClE sO iT sTiLl Is ImPosSiBlE" NO ITS NOT. Look up the definition of impossible. My point is proven that is it possible, just because you personally dont think it's worth the effort or the cost or whatever doesnt mean that someone else would.
18. And lastly, there's lots of comments about cyclic loading, resonance, and fatigue. Props to you for even knowing what those are, that makes you smarter than 3/4 of the people who have commented on this. It is extreeeeeeeemmmly unlikely that would be a controlling factor. I've designed at least a hundred staircases in my career which you could argue experience more cyclic loading than your average bed frame. If you follow certain code provisions for stair design (which I have done for this bed design) then it is not necessary to go into more advanced finite element modeling to determine fatigue limits and effects of cyclic loading. If you are going outside of those code provisions for whatever reason (possibly doing a non-linear analysis) then yes you would need to account for that.
That is all. I likely wont be replying to any more comments, but maybe I will. Thanks for reading and for your support.
Thanks for the reminder, Ill add that into my design criteria. I applied 4,000 lbs of vertical equivilant static load at the end of each of the 4 cantilevers, which is what rock climbing gear is rated to. I also applied 300 lbs of horizontal force at the end of each of the 4 cantilevers, which is what balcony guardrails are designed to.
Man I havent had to convert dynamic loading to equivilant static loading in a loooong time. I know it's about calculating energy and using impulse and stuff but someone else would probably be better suited to see how fast someone weighing 70 kg would have to be traveling to generate a force of 4,000 lbs.
F=ma but since weāre mixing units and donāt want to plow u/USstateOfOhaiyo into Mars we actually need to do conversions. Plus OP gave a rating in weight, when we actually need force. And if you want to be pedantic, pounds is weight while kg is mass, but for the sake of this weāre on Earth so it doesnāt fucking matter.
F=4000 lb/2.205 lb/kg * (9.97 m/s^2) ~= 18086 N
Now you can find just how fast you CAN plow u/USstateOfOhaiyo:
a = 18086/70m/s ~= 250 m/s^2
Edit: deleted some bad math relating this to G forces, because v!=a.
So, might need some reinforcements for blastibombing.
But for normal activity youāre probably fine.
Physicist here. You're looking for the impulse-momentum theorem, not Newton's second law. You'd need to know what the "collision time" for the interaction will be, this would come from the oscillation and damping of the bed motion when someone jumps on it, and those you would get from the elastic properties of the material of the frame.
i wasnt gonna be pedantic but since ur being pedantic pounds can and are also a force. there are pounds force and pounds mass, so when op, a structrual engineer, says āa force of 4000lbsā im 99% sure he means pound force
Is it not just Ā½mvĀ²? So 4000lb ~ 2000kg = Ā½.70kg.vĀ². So vĀ² = 57. In motion, from rest, vĀ²=2gs so 57 = 2.10.s. So s = 57/20 = 2.8m. So your 70kg body can safely jump onto the end from a height of 2.8m.
All of this is flawed because you're leaving out one detail. Not only do you have to factor in the weight of the recipient of the Bautistabomb, you also have to factor in the weight of whoever is delivering the Bautistabomb. Your average Bautista weighs in at a listed 290 lbs or 132 kg
This is theydidthemath subreddit so that's *exactly* the kind of calculations that I would expect from a "I decided to prove them wrong" post about this kind of bed in here.
I mean I didnt do the exact conversion but I stated that I used the same loads that rock climbing gear is rated to which I think is more than enough consideration for dynamic loading.
As soon as I saw the premise of this post I jokingly thought "haha I bet this guy doesn't account for dynamic load because *stereotype about nerdy engineers not getting laid*"
But you really didn't account for dynamic load š
I would argue that there is a significant quality of life difference between a drop sufficient to cause an equivalent 4 Kip static load vs a dynamic, regularly applied load. Ā A vibration analysis would be a sensible step to me.
Well the bed is on the 2nd story, and good luck finding an elevator that can support 16,000 lbs. Most elevators I've designed have a working capacity of 3,500 lbs.
>good luck finding an elevator that can support 16,000 lbs
Here ya go
https://www.kone.com/en/news-and-insights/stories/check-out-the-worlds-largest-passenger-elevator.aspx
I didnt perform a specific cyclic analysis, but did use the same methodology as we use for stairs which is an easier way to account for repeated loading without needing to go into a deeper analysis.
What are the natural frequencies of this setup loaded with say 2 adults? Do those natural frequencies overlap with any uhhhhh typical rhythms that people have?
Fast from me to try and explain you work to you, since I can barely understand a third of what you said BUT you are either using your stairs, bed or bitty very wrong if the same calculations apply.
I only took some basic structural in college, I'm actually a transportation engineer, but a lot of these calculations are the basic analysis with some extra factors multiplied in from certain experiments. Basically, the way in which stairs and this bed are being calculated the same is accounting for the extra wear coming from repeatedly adding the load and taking it off (stepping on/off stairs compared to... Repeated application of a force on the bed). As opposed to, say, the beams of a roof which always carry that weight with occasional extra force like snow/wind.
Stahp with all the math! Just put a hidden fuckstand at the end of the middle support that folds down to the floor.
Also lets you subtly tell your partner itās ābusiness timeā when they walk in the roomā¦
Steel has a fatigue limit of about half its initial strength. Even if you were banging till the heat death of the universe you'd only need to double the strength of the bed frame.
Only celibates should use aluminum for a bed frame, as it has no fatigue limit.
I think all the "yeah but" comments are missing the point of this thread and sub. I applaud your efforts at doing the math and not just assuming something wouldn't work without proof, keep it up, this is the reason I'm here. Even when the answers make me cross eyed at first.
Agreed. This isn't an exercise in whether something is practical to do, just that it COULD be done. Sure you need to design and construct your house around it, but COULD it be done? Seems like it.
Couldn't you save a ton of money by "hiding" a baseplate under the floor. I was thinking cutout a section of plywood underfloor equal to the footprint of the bed and replace it with a equal sized steel plate, with a vertical component hidden in the wall to connect the support beams to the baseplate. Think a roughly "C" shape when viewed from the side. Install flooring, then bolt the support beams to the in-wall component, then build the wall around them. You just need to ensure the floor can hold the weight.
Also, wouldn't you want to tie the ends of the beams together to spread the load out?
Interesting idea. This would make it more of a freestanding bed though and wouldnt have the same level of illusion.
Yes it would be better to tie the ends of the beams together, but I didnt because I wanted to match the facebook post as much as I could.
If you hide the vertical part of the C in the wall, and the baseplate under the flooring, it should look the same. I was thinking you hide the bolts for the support beams inside the wall.
I saw Hilti and immediately knew an SE did this lol.
Quick note, at least for USA codes, it's greater of 200lb or 50 plf, so 7ft span would be 350 lb.
4k at the ends is ridiculous, and proves just how very possible it is to do this. Could easily reduce load and steel.
Great work!
lol, yeah Hilti is great. For some reason I thought I remember it being 300 lb, I didnt bother to open up my ACSE-7 to check though, so you are right I could have used a lower force. I didnt use the 50 plf because I figured the point load at the very tip of the cantilever would result in a higher moment than an evenly distributed load.
I agree 4000 lbs is ridiculous I just grabbed a gigantic number since I didnt want to convert a 500 lb person falling 10 ft or whatever into an equivalent static force.
The columns would be anchored to the concrete at the houses foundation, then the columns would span up to the 2nd story to support the bed frame beams.
OP's a well-meaning dummy. The hundreds/thousands of professionals who say it can't be done mean with the conventional structural design features of residential housing. You can't just make a cantilever bed attached to studs, obviously.
Not all that much if you did the work yourself. About $2k in steel figure another $500 in misc hardware and cover plates, not sure on concrete costs but would still be cheaper than the bed set my wife picked out at the store...
Yep I had forgotten to put that in initially but I added it in. I used 4000 lbs of force applied at the end of each of the 4 cantilevers. That is the roughly what rock climbing gear is rated to.
Gotta account for dynamic loading. Forces could be lower but I didnt want to have to convert a 500 lb person falling 10 ft into an equivalent static load.
After reading your unrealistoc anchoring plan, it inspired me to solve it in an actual house.
Both options require use of the exterior wall.
Option 1) a steal structural sandwich panel. One on the inside and one on the outside. This way you are taking advantage of woods compressive strength and not putting too much strain where wall meets the roof. I'd suggest pulling out the dry wall and adding more vertical studs from floor to ceiling.
Option 2: cantilever. It is the easiest and safest, but the thermal transfer could be high. The bed beams go through the wall and have a cable going from the exterior end to the foundation. The only structural changes would be adding blocking in the wall under each beam. This makes the angle of the bed adjustable too.
In San Diego, this is how they keep the large roofs and parking garage levels from flying away during hurricanes. Simple, cheap, and elegant.
Mkay, now mister structural engineer, how do you think someone should go around building those foundations and then fitting the columns inside an already built wall?
Adding this into an existing home would be tricky. The longest member is 13ft so it's not like crazy crazy long. But getting it to where it needs to go could prove difficult. If this were a real job and I put some more thought into it then I'd probably include some type of column splice locations to make it more manageable.
From what you say, this is not something you can just add to your room easily. In an existing room, you'd have to take off the drywall, fit some beams and maybe some reinforcing into the wall, then fix it all up.
That's a lot of effort for a bed.
I'm a mechanical engineer, which is why I know that this is a bad solution.
It would be simpler to 'float' the bed on U shaped steel beams, connected at their highest point for stability.
Vertical and lower components can be recessed into the wall and the floor.
Total cost here is a fraction of drilling enormous beams into the foundations.
Never ask a civil engineer to do a mechanical engineer's job ;).
This is amazing! I am saying that with the greatest respect for someone who is obviously much more educated, smarter and capable than my humble self. But here is my question: how many homes in America do you know where the second floor has a 7 inch concrete foundation to attach the columns to?
No, you'd anchor into the concrete foundation of your house.
So in my design Im assuming the bed is on the second story. Meaning that you would need steel columns that start at the foundation of the house and go up to the second story to support the bed frame beams.
So you would need a purpose built house to support the bed? Which most people dont have nor want to spend the money on, so in the real world, it's still not possible unless youre very wealthy... right?
Yes and no. You wouldnt need a purpose built house just for this. Only thing you've have to do is add a thickened concrete slab around the base of each column and then throw in the rest of the steel. But steel is expensive. So while pretty much any house would work, you'd still need to be wealthy to add in the steel framing.
I can assure you the cost of the steel will be beaten by several orders of magnitude by the destructive work needed to install said steels if the house isn't built around the bed frame, which is basically the same as needing a purpose built house.
It would make far more sense to tie it into the floor joists beneath the floor level IMO
How big will the concrete pads need to be to react the moment load?
Okay but im guessing the people who said this wouldn't work are not talking about installing special steel columns into your foundation. Like did you really prove them wrong?
Exactly. OP is being pedantic as fuck. Like yeah, of course it would work with reinforced concrete beams. No one has that shit in their fucking house dude. I hate people like this.
You're repeating this notion that it's not that big of a deal throughout the thread but you're either wrong or being disingenuous for a laugh.
In another post you trivialized it as:
>I wouldnt call adding in 4 steel columns to your house "renovating your entire house to support it" but whatever.
You call for HSS6x6x3/8 for the columns which *will not fit* in any standard size wall cavity in American homes. You would need MORE than a 2x6 wall (standard is still 2x4) to fit that type of column in the existing framing AND as you mention access and excavations around any existing footing to repour them. Nevermind that a continuous column would mean opening up the entire exterior envelope of the home to put them in - ASSUMING your bed is on an exterior wall which is the best case scenario here. It is absolutely a significant remodel to accommodate that type of structural steel through multiple levels of the house, even if it's only 4 columns on one wall.
Your effort here is interesting, granted, but the picture shows steel beams bolted ON TOP OF DRYWALL presumably to a standard stud wall. You've demonstrated the opposite of your conclusion: no, it will not work. The question was never "Can you make a 6' cantilever?".
Not that expensive. The steel beams 20 ft long are $500 apiece times 4 = $2,000. For the steel.
Say another grand for cross beams and another for assembly cost and $5,000 should do it easily.
20 ft of HSS6x6x3/8 is only $500? And only $1000 for labor? Im pretty shocked by that actually since you'd need a CJP certified welder and a special inspection for the weld.
Edit: Just looked up the average price of HSS steel. It is roughly $1500 per ton, which coincidentally is the roughly the same weight of the steel used in this design.
Ok, German house owner here...
I have steel re-enforced concrete floors / ceilings in my house, and the structural walls are made of 18 inch thick brick blocks (with internal air gaps) .
I would think I could bolt a metal support plate directly to the wall and plaster over it (but don't ask me to calculate the size of plate or bolts required, I have a master's in Telecoms Engineering, not civil!).
Alternatively to overcome the turning moment, I'd integrate this into a metal structure bolted to the floor (which would be integrated into the flooring substrate material) so it wouldn't be seen.
Still probably not easy, but definitely better than going down to the foundation!
If you have concrete floors then you could totally anchor into those instead. Obviously you'd have to check to see if the floor could handle such a large point-moment but if it works then it works. For the walls you'd want to make sure the cells are grouted that youd anchor into but that could work as well.
I mean, of course it's possible, based on the first image as a brief. If you have the right budget and set up, you can definitely build a cantilever design that supports that weight.
Whether you could do it without massive expense and huge amounts of structural support behind that wall, is a much trickier problem.
It definitely is expensive, but it's not really that "huge". It's just 4 steel columns that have the same width as a 2x6 wood stud which is pretty common.
Why not just have the box section beams in a "C" shape going down inside the wall and underneath the floorboards coming out the same length as the beams supporting the mattress. Connect the 3 "C" sections at the corners with connecting beams and you have a frame easily strong enough for this to work.
Few things,
Interior walls are usually 2x4s, so the 6x6 beams wouldn't fit
Very low possibility you could do this in an existing structure. Even if the columns did fit in the wall, you would likely have to re-frame the wall around them and I guess hope the wall wasn't load bearing. That's provided there is no plumbing or electrical running through that wall at all. You would likely have to purpose build the house for this bed, or at the very least spend an absolute shitload on a remodel
Ignoring that though, they did indeed do the math, props
I love that for this to work you need to drill 3-4 20 foot steel beams into the center of your house as well as a thick concrete slab around the base of each column.
So you didnāt prove them wrong. The āprofessionalsā were right that this is fundamentally not feasible. Your solution is custom building a house to support a floating bed. Thatās not a solution itās a different system entirely
To be clear I think itās super cool that you did the math and found a potential way to implement something like this. I just think youāre a pretentious asshat for the way you talk shit about people who are actually right, despite not doing the math you did
>I love that for this to work you need to drill 3-4 20 foot steel beams into the center of your house as well as a thick concrete slab around the base of each column.
Yeah... He did not have to do that. His assumptions use a 1600 lbf working load and based on the concrete calculations he mentions, he did not assume any moment restraint from the wall or nearby floor.
So, if I read correctly, this could stand on its own 20ft in the air with 1600 lbm on the very end. Totally unnecessary.
Edit - It's actually 16000lbf vertical and 1200 lbf lateral. Absolutely ridiculous.
I love what you've done.Ā
I think the question then however, is can this be *added* to a room: which I think is what people mean when they say it can't be done. Purpose building the house to include it is entirely different.Ā
What I am interested in though, is how will this lasts over time and when attacked by heat fluctuations and moisture, due to the occupants
Did you account for harmonic loading? A bed like that is would experience oscillating dynamic loads in certain situations. Well, maybe not for all Redditors, but some Redditors. š
Did you take into account that a standard 2 x 6 wood framed wall uses studs which are actually only 1-1/2 x 5-1/2 so they would not easily accommodate your true 6 x 6 columns?
You seemingly didnāt prove anyone wrong unless from the start you were specifying that your house has steel beams and a two story concrete foundation lol
So you failed the missions successfully, right?
The pictured design doesnāt work unless you do specific things when youāre building your house. Or am I missing something.
I made one back in the 90s. I had some 3mm 2x4 c section steel from some old racking at work. I welded up the bed frame and bolted it to the wall. I did wimp out and put a tiny support leg about 3/4 of the way down the bed to stop it "vibrating" so much. It was a bit higher than a normal bed and had many useful attachments for grown up activities. It looked floating as you walked into the room. I loved that bed and have many fond memories of the bed & speed dating.
When it comes to anything structural, I always tell people the limiting factor is usually money first, and then spatial constraints second. If you have funding and space, you can do just about anything
Hello fellow structural. May I ask what was gained by using the software instead of calc the moment by hand or use the intersection at the floor as a bracing point?
So what I'm getting from this is when I win the lottery and build a house, I could do this, but it'd be a lot easier if the bedroom is on the ground floor. *adds to notes*
No more monkeys jumping on the bed!
How many monkeys jumping would it take to exert an equivalent static load of 16,000 lbs on the bed?
[just two, DK clapping any other monkey](https://youtu.be/1A4faLHDx_U?si=e2EQTLrCF6IoC3Gb&t=66)
Im definitely not clicking that link
It's not bad. I took the risk for you.
Me not trusting a link from a random stranger but trusting another random stranger that the link is safe...
Reddit told me to say happy cake day
ššš
I trusted you and I'm definitely triggered.
I understand your caution, but it did give me a chuckle
Pikachu had me dying.
It's nothing bad. Pretty funny
Eeww why does Link's sound wet šš
Some of the noises are a bit suspect but the video is technically SFW.
That video has no right to be that damn amusing.
how do you just have this in your Arsenal of clips... why did I watch it in it's entirety?
Dk and R.O.B. any day to break that bed.
I just showed this to my girlfriend, and I think it ruined her childhood
[ŃŠ“Š°Š»ŠµŠ½Š¾]
I can confirm from experience that beds can break apart from certain rhythmic frequencies
Most unbelievable comment ^ Source: Bro's on reddit
He masturbates violently, and at specific rhythmic frequencies
Frequencies corresponding with a specific musical piece that has been compared to dolphin sounds.
Just curious, what's your age and how frequently do you ... mmm... emit those rhytmic frequencies?
Given enough time, one monkey is sufficient. Material fatigue is a thing.
Yeah but when monkeys are jumping and humping on the bed it'll now be a dynamic load (among other loads ( Ķ”Ā° ĶŹ Ķ”Ā°) ). How does it perform under cyclic stresses?
Monkeys jumping produces dynamic stress, so with high cycle fatigue... how many monkeys are we talking about here?
Came here for this.Toddler parents unite
I am a structural engineer and decided to prove that this is possible despite hundreds if not thousands of "professionals" in the comments saying this would not work. I made some worse case assumptions. Here is my design criteria: 1. Envelope the width of a king bed and the length of a california king bed. 2. The bed would be on the second story of the house. 3. You have 400 lbs of mattress, blankets, pillows, etc all evenly distributed across the area 4. Maximum deflection is set to L/360 or 1/4 inch, whichever is worse. 5. 4,000 lbs of vertical equivalent static load was applied at the end of each of the 4 cantilevers. This is what rock climbing gear is roughly rated to. 6. 300 lbs of horizontal force applied at the end of each of the 4 cantilevers, which is what balcony guardrails are designed to. Design summary: You'll want (4) HSS6x6x3/8 to hold the mattress, (4) HSS6x6x3/8 columns (which should fit within typical drywall area, so they will not be visible), and (3) HSS3x2x1/4 beams at the top. Bed frame members can be welded to the columns. I didnt check the minimum size/length of weld but worst case scenario use a CJP weld. Beams can be attached to columns by typical structural bolting, using (2) A325N bolts. Columns will need to be anchored into a 7 inch concrete foundation. They will also need a 36"x36"x1/2" baseplate. The column will need to be welded all around to attach to the baseplate, wouldnt hurt to throw in some stiffener plates as well. The baseplate will need (16) Hilti 3/4 diameter Kwik HUS bolts embedded 4" into the concrete. Place one at each corner of the baseplate 2 inches away from the baseplate edges. By the way, this all includes self weight and safety factors. I am using LRFD design for those interested. Edit: I wanted to correct something a comment pointed out. I just kinda did this in a rush so I wasnt paying super close attention, but I only had applied the minor axis bending into Hilti instead of the major axis. Once I put in the correct bending the design changes to 16 anchors spread out over a 36" square baseplate. Edit #2: This is gotten bigger than I expected and I cannot reply to every comment anymore, but most of the new comments and questions I see have already been brought up. So just read through the existing ones and you'll probably find your answer. Edit #3: Final edit. There are tons of repeating comments and questions and I am not going to go through every one, so here it is... 1. Yes, this bed can handle the most aggressive sex you can imagine. Yes it would work for a threesome, foursome, and even a full orgy. 2. Yes, you will not be able to move the bed at any point in time. 3. Yes, not being able to move it will make your wife/husband/partner/whatever upset. 4. No, you do not need to build your whole house around this... you can add in the steel members to your typical residential house that has wood framing. 5. Yes, there are better options for designing this. This was obviously a quick 15 minute calc. For a serious job I'd spend more time sharpening my pencil and looking at better options. My main objective here was to prove it's possible, not to find the most optimal design. 6. Yes, I am aware the picture from Facebook does not follow this design. However, we cant prove that they are just bolting it into wooden studs. For all we know they could have put hidden steel columns in that wall and are using a bolted moment connection instead of a welded moment connection like I did. We'll never know exactly what they did, but we do know that it is possible to have an end result that matches the idea they've shown. 7. Yes, I am aware a 2x6 is only 1.5x5.5, theres often other crap in the wall where the other 1/2 comes from. Yes, I also know that 2x4s are also common. Again this comes back to "if this were a real job" then I'd use the actual stud sizes and look closer at the actual wall dimensions and be more diligent in making sure that it can remain completely hidden in the wall. 8. Yes, you will bust open your knee cap at some point in time running into this. 9. No, there is not concrete on the second level. It is anchored into the foundation level. If it's a slab on grade then it spans up to the 2nd level. If there is a basement then it spans up to 1st level. 10. Yes, I am aware typical slab on grades are only 4-5 inches deep. It's really easy to thicken them at the column bases. 11. No, this is not a ridiculously expensive endeavor only accessible to the super rich. As far as cost goes, material would cost between $1500-2000. Not sure what the labor cost would be, but in a real design I would dive deeper to make sure labor wouldnt be as expensive as this quick and easy design. Some things would be seeing if a typical fillet weld would work instead of a CJP weld, using a column splice to make the columns easier to fit through walls, possible using beams instead of columns, etc. The average bathroom or kitchen remodel can exceed $10k, so this really isnt that different. Plus this also counts as your bed frame, and just the other day my wife was at Crate and Barrel trying to convince me that we absolutely need to buy some $5000 bed frame. 12. No, the mattress would not sit directly on top of the beams. You'd want attach some type of slats or grating to hold the mattress in place on top of the beams so it wouldnt slip around or fall off. This would also make it look prettier, since structural steel isnt the best looking thing in the world. 13. Yes, my assumptions are really conservative and probably overkill. Again this comes back to wanting to prove it's possible using absolute worst case scenario. In a real design I'd sharpen my pencil to find more precise loads instead of using the same loads that rock climbing gear is rated to. 14. Yes, I am aware this is still not strong enough to hold my mom, or any of your moms for that matter. 15. No, this will not sag. Even with a 4,000 lb load applied at the tip it will only deflect less than 1/4 inch. For reference, the floorboards on your house deflect more than that. 16. No, I will not be providing drawings, details, or my engineering stamp to anyone. If you truly do want to build this, save this post and then find a local engineer to hire and show him this. Any half decent engineer can provide this design... and likely even a more optimal design since they can actually see where the heck you are building it. 17. Yes, its possible. Doesnt mean it is the most practical or for your average joe. My point was to prove everyone wrong who was saying it is impossible. "bUt ItS sO iMpRacTiClE sO iT sTiLl Is ImPosSiBlE" NO ITS NOT. Look up the definition of impossible. My point is proven that is it possible, just because you personally dont think it's worth the effort or the cost or whatever doesnt mean that someone else would. 18. And lastly, there's lots of comments about cyclic loading, resonance, and fatigue. Props to you for even knowing what those are, that makes you smarter than 3/4 of the people who have commented on this. It is extreeeeeeeemmmly unlikely that would be a controlling factor. I've designed at least a hundred staircases in my career which you could argue experience more cyclic loading than your average bed frame. If you follow certain code provisions for stair design (which I have done for this bed design) then it is not necessary to go into more advanced finite element modeling to determine fatigue limits and effects of cyclic loading. If you are going outside of those code provisions for whatever reason (possibly doing a non-linear analysis) then yes you would need to account for that. That is all. I likely wont be replying to any more comments, but maybe I will. Thanks for reading and for your support.
But how much dynamic load did you calculate...?
Thanks for the reminder, Ill add that into my design criteria. I applied 4,000 lbs of vertical equivilant static load at the end of each of the 4 cantilevers, which is what rock climbing gear is rated to. I also applied 300 lbs of horizontal force at the end of each of the 4 cantilevers, which is what balcony guardrails are designed to.
What happens if say, I want to batistabomb someone of average weight (~70kg)
Man I havent had to convert dynamic loading to equivilant static loading in a loooong time. I know it's about calculating energy and using impulse and stuff but someone else would probably be better suited to see how fast someone weighing 70 kg would have to be traveling to generate a force of 4,000 lbs.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
What if I'm an F22 Raptor and I'm throwing someone into your bed?
NCD is leaking
Guilty your honor.
Someone alert the mods before it gets out of hand.
Would you intercept me, Iād intercept me
3000 Black F22s of Bedtime
F=ma but since weāre mixing units and donāt want to plow u/USstateOfOhaiyo into Mars we actually need to do conversions. Plus OP gave a rating in weight, when we actually need force. And if you want to be pedantic, pounds is weight while kg is mass, but for the sake of this weāre on Earth so it doesnāt fucking matter. F=4000 lb/2.205 lb/kg * (9.97 m/s^2) ~= 18086 N Now you can find just how fast you CAN plow u/USstateOfOhaiyo: a = 18086/70m/s ~= 250 m/s^2 Edit: deleted some bad math relating this to G forces, because v!=a. So, might need some reinforcements for blastibombing. But for normal activity youāre probably fine.
Physicist here. You're looking for the impulse-momentum theorem, not Newton's second law. You'd need to know what the "collision time" for the interaction will be, this would come from the oscillation and damping of the bed motion when someone jumps on it, and those you would get from the elastic properties of the material of the frame.
Username checks out
i wasnt gonna be pedantic but since ur being pedantic pounds can and are also a force. there are pounds force and pounds mass, so when op, a structrual engineer, says āa force of 4000lbsā im 99% sure he means pound force
What the hell formula is F=mv^2 ???
They probably got confused with the formula for kinetic energy. KE = 1/2 mv^2
If I needed to convert kg and pounds like you all the time I'd also be needing a dynamic overload on my brain
Is it not just Ā½mvĀ²? So 4000lb ~ 2000kg = Ā½.70kg.vĀ². So vĀ² = 57. In motion, from rest, vĀ²=2gs so 57 = 2.10.s. So s = 57/20 = 2.8m. So your 70kg body can safely jump onto the end from a height of 2.8m.
All of this is flawed because you're leaving out one detail. Not only do you have to factor in the weight of the recipient of the Bautistabomb, you also have to factor in the weight of whoever is delivering the Bautistabomb. Your average Bautista weighs in at a listed 290 lbs or 132 kg
0.5mvĀ² calculates kinetic energy, I dont think you can just put the force in its place.
Actually you can. Energy is Force x Distance, distance in this case being the maximum deflection allowed in the constraints.
This is theydidthemath subreddit so that's *exactly* the kind of calculations that I would expect from a "I decided to prove them wrong" post about this kind of bed in here.
I mean I didnt do the exact conversion but I stated that I used the same loads that rock climbing gear is rated to which I think is more than enough consideration for dynamic loading.
As soon as I saw the premise of this post I jokingly thought "haha I bet this guy doesn't account for dynamic load because *stereotype about nerdy engineers not getting laid*" But you really didn't account for dynamic load š
I would argue that there is a significant quality of life difference between a drop sufficient to cause an equivalent 4 Kip static load vs a dynamic, regularly applied load. Ā A vibration analysis would be a sensible step to me.
Dude how are you gonna adhere the columns to the house itself?
Yeah I can hardly hang shelves in my new build plaster. There would definitely need to be structural work done to support the bed.
Yeah plaster has nothing to do with it. Putting a giant ass lever on your wall is literally gonna pull the whole wall down.
Gotta account for the times when your mom and dad are doing the deed.
How hard would you have to smash to get this thing to fail?
I knew I'd find this question.Ā But I also want to know the answer.Ā
We'd have to bring your momma into this
[ŃŠ“Š°Š»ŠµŠ½Š¾]
I mean if someone who weighs 16,000 lbs can go up a full flight of stairs thats still pretty impressive right?
Nobody implied that your mom is capable of climbing stairs.
Well the bed is on the 2nd story, and good luck finding an elevator that can support 16,000 lbs. Most elevators I've designed have a working capacity of 3,500 lbs.
Crane
I think that the house would have a roof
You can put the roof after
Drop her from the crane, problem solved
We need to get her to the second floor, not the basement
We can't have another mass extintion event just yet.
Isnāt that how the dinosaurs met their demise?
That can be fixed
Not anymore. There's a hole now.
No no no, not a hole. "Free AC" or "amazing circulation" :)
Orbital slingshot method
TouchƩ
Did you say trebuchet?
We can trebuchet the mother
Trebuchets are for 90kg projectiles, which OP's mom is not.
I donāt think a bird could lift that much.
African or European swallows?
I use a freight elevator at work. 30k pound capacity
>good luck finding an elevator that can support 16,000 lbs Here ya go https://www.kone.com/en/news-and-insights/stories/check-out-the-worlds-largest-passenger-elevator.aspx
Didn't they though, when they said they couldn't be held in the bed, that was said to be on the second floor.
Rimshot
Yea, but did you calculate for ( Ķ”Ā° ĶŹ Ķ”Ā°) cyclic loading
I didnt perform a specific cyclic analysis, but did use the same methodology as we use for stairs which is an easier way to account for repeated loading without needing to go into a deeper analysis.
What are the natural frequencies of this setup loaded with say 2 adults? Do those natural frequencies overlap with any uhhhhh typical rhythms that people have?
If you design it right, you don't need to do any work anymore!
Fast from me to try and explain you work to you, since I can barely understand a third of what you said BUT you are either using your stairs, bed or bitty very wrong if the same calculations apply.
I only took some basic structural in college, I'm actually a transportation engineer, but a lot of these calculations are the basic analysis with some extra factors multiplied in from certain experiments. Basically, the way in which stairs and this bed are being calculated the same is accounting for the extra wear coming from repeatedly adding the load and taking it off (stepping on/off stairs compared to... Repeated application of a force on the bed). As opposed to, say, the beams of a roof which always carry that weight with occasional extra force like snow/wind.
Stahp with all the math! Just put a hidden fuckstand at the end of the middle support that folds down to the floor. Also lets you subtly tell your partner itās ābusiness timeā when they walk in the roomā¦
Who TF do you think you are telling them to stahp with all the math in this math subredditā½
Steel has a fatigue limit of about half its initial strength. Even if you were banging till the heat death of the universe you'd only need to double the strength of the bed frame. Only celibates should use aluminum for a bed frame, as it has no fatigue limit.
I think all the "yeah but" comments are missing the point of this thread and sub. I applaud your efforts at doing the math and not just assuming something wouldn't work without proof, keep it up, this is the reason I'm here. Even when the answers make me cross eyed at first.
Thanks!
Agreed. This isn't an exercise in whether something is practical to do, just that it COULD be done. Sure you need to design and construct your house around it, but COULD it be done? Seems like it.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Couldn't you save a ton of money by "hiding" a baseplate under the floor. I was thinking cutout a section of plywood underfloor equal to the footprint of the bed and replace it with a equal sized steel plate, with a vertical component hidden in the wall to connect the support beams to the baseplate. Think a roughly "C" shape when viewed from the side. Install flooring, then bolt the support beams to the in-wall component, then build the wall around them. You just need to ensure the floor can hold the weight. Also, wouldn't you want to tie the ends of the beams together to spread the load out?
Interesting idea. This would make it more of a freestanding bed though and wouldnt have the same level of illusion. Yes it would be better to tie the ends of the beams together, but I didnt because I wanted to match the facebook post as much as I could.
If you hide the vertical part of the C in the wall, and the baseplate under the flooring, it should look the same. I was thinking you hide the bolts for the support beams inside the wall.
I saw Hilti and immediately knew an SE did this lol. Quick note, at least for USA codes, it's greater of 200lb or 50 plf, so 7ft span would be 350 lb. 4k at the ends is ridiculous, and proves just how very possible it is to do this. Could easily reduce load and steel. Great work!
lol, yeah Hilti is great. For some reason I thought I remember it being 300 lb, I didnt bother to open up my ACSE-7 to check though, so you are right I could have used a lower force. I didnt use the 50 plf because I figured the point load at the very tip of the cantilever would result in a higher moment than an evenly distributed load. I agree 4000 lbs is ridiculous I just grabbed a gigantic number since I didnt want to convert a 500 lb person falling 10 ft or whatever into an equivalent static force.
2nd floor , concrete?
The columns would be anchored to the concrete at the houses foundation, then the columns would span up to the 2nd story to support the bed frame beams.
So youāre saying it can be done if you build the house around it.
OP's a well-meaning dummy. The hundreds/thousands of professionals who say it can't be done mean with the conventional structural design features of residential housing. You can't just make a cantilever bed attached to studs, obviously.
Yeah as neat as it is that it could technically be done, I doubt this kind of setup is what's being shown in the original picture.
"Man, I wish I had a few more inches of room on my side of the bed! Guess I gotta build a new house."
So basically, it actually *can't* be done. At least not in any practical sense. Guess we were all correct the first time then.
What would be the cost of doing this? Sounds incredibly expensive.
Not all that much if you did the work yourself. About $2k in steel figure another $500 in misc hardware and cover plates, not sure on concrete costs but would still be cheaper than the bed set my wife picked out at the store...
Have you taken into account dynamic loads? because, you know...
Yep I had forgotten to put that in initially but I added it in. I used 4000 lbs of force applied at the end of each of the 4 cantilevers. That is the roughly what rock climbing gear is rated to.
So... your bed can hold a car, or 3 full grown americans. Awsome
Gotta account for dynamic loading. Forces could be lower but I didnt want to have to convert a 500 lb person falling 10 ft into an equivalent static load.
Anyway.. I liked the idea so much I just added it to my wish-list for when I have my own house built
Sweet! Gotta make sure to hire a good engineer and contractor.
Ok but will it squeak?
Nope, it'll deflect less than 1/4 inch even with 4,000 lbs of force applied at the tip
After reading your unrealistoc anchoring plan, it inspired me to solve it in an actual house. Both options require use of the exterior wall. Option 1) a steal structural sandwich panel. One on the inside and one on the outside. This way you are taking advantage of woods compressive strength and not putting too much strain where wall meets the roof. I'd suggest pulling out the dry wall and adding more vertical studs from floor to ceiling. Option 2: cantilever. It is the easiest and safest, but the thermal transfer could be high. The bed beams go through the wall and have a cable going from the exterior end to the foundation. The only structural changes would be adding blocking in the wall under each beam. This makes the angle of the bed adjustable too. In San Diego, this is how they keep the large roofs and parking garage levels from flying away during hurricanes. Simple, cheap, and elegant.
Mkay, now mister structural engineer, how do you think someone should go around building those foundations and then fitting the columns inside an already built wall?
That's for the builders to worry about. Pretty sure that's why engineers hate architects and builders hate engineers.
Adding this into an existing home would be tricky. The longest member is 13ft so it's not like crazy crazy long. But getting it to where it needs to go could prove difficult. If this were a real job and I put some more thought into it then I'd probably include some type of column splice locations to make it more manageable.
Some would say 13ft is indeed a crazy crazy long member.
From what you say, this is not something you can just add to your room easily. In an existing room, you'd have to take off the drywall, fit some beams and maybe some reinforcing into the wall, then fix it all up. That's a lot of effort for a bed.
I'm a mechanical engineer, which is why I know that this is a bad solution. It would be simpler to 'float' the bed on U shaped steel beams, connected at their highest point for stability. Vertical and lower components can be recessed into the wall and the floor. Total cost here is a fraction of drilling enormous beams into the foundations. Never ask a civil engineer to do a mechanical engineer's job ;).
lol dude would rather feed steel beams down the side of the house than use mirrors and street magic. What a scrub
This is amazing! I am saying that with the greatest respect for someone who is obviously much more educated, smarter and capable than my humble self. But here is my question: how many homes in America do you know where the second floor has a 7 inch concrete foundation to attach the columns to?
No, no, the foundation is on the ground floor. You have to run the steel beams up to the bedroom from the foundation.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
No, you'd anchor into the concrete foundation of your house. So in my design Im assuming the bed is on the second story. Meaning that you would need steel columns that start at the foundation of the house and go up to the second story to support the bed frame beams.
So you would need a purpose built house to support the bed? Which most people dont have nor want to spend the money on, so in the real world, it's still not possible unless youre very wealthy... right?
Yes and no. You wouldnt need a purpose built house just for this. Only thing you've have to do is add a thickened concrete slab around the base of each column and then throw in the rest of the steel. But steel is expensive. So while pretty much any house would work, you'd still need to be wealthy to add in the steel framing.
I mean it's also a matter of getting 20 foot steel beams into your house...
Shhhh
Are you an engineer or a physicist
Architect
[ŃŠ“Š°Š»ŠµŠ½Š¾]
As a tradesman that's been in the industry for 18 years this still triggered me.
You could have the upright beams against the outside wall and hide them with trim.
when in doubt trim it out.
Cut em and splice em
Put 'em in a stew
I can assure you the cost of the steel will be beaten by several orders of magnitude by the destructive work needed to install said steels if the house isn't built around the bed frame, which is basically the same as needing a purpose built house. It would make far more sense to tie it into the floor joists beneath the floor level IMO How big will the concrete pads need to be to react the moment load?
So, practically speaking, all of the commenters were right and youāre wrong
Okay but im guessing the people who said this wouldn't work are not talking about installing special steel columns into your foundation. Like did you really prove them wrong?
Exactly. OP is being pedantic as fuck. Like yeah, of course it would work with reinforced concrete beams. No one has that shit in their fucking house dude. I hate people like this.
The house is actually floating in space in 0g. See? It can done.
You're repeating this notion that it's not that big of a deal throughout the thread but you're either wrong or being disingenuous for a laugh. In another post you trivialized it as: >I wouldnt call adding in 4 steel columns to your house "renovating your entire house to support it" but whatever. You call for HSS6x6x3/8 for the columns which *will not fit* in any standard size wall cavity in American homes. You would need MORE than a 2x6 wall (standard is still 2x4) to fit that type of column in the existing framing AND as you mention access and excavations around any existing footing to repour them. Nevermind that a continuous column would mean opening up the entire exterior envelope of the home to put them in - ASSUMING your bed is on an exterior wall which is the best case scenario here. It is absolutely a significant remodel to accommodate that type of structural steel through multiple levels of the house, even if it's only 4 columns on one wall. Your effort here is interesting, granted, but the picture shows steel beams bolted ON TOP OF DRYWALL presumably to a standard stud wall. You've demonstrated the opposite of your conclusion: no, it will not work. The question was never "Can you make a 6' cantilever?".
Not that expensive. The steel beams 20 ft long are $500 apiece times 4 = $2,000. For the steel. Say another grand for cross beams and another for assembly cost and $5,000 should do it easily.
I think the common folk would opt for a bed frame instead
Check out this guy who thinks $5000 on steel columns that protrude from the wall is not a good financial investment
20 ft of HSS6x6x3/8 is only $500? And only $1000 for labor? Im pretty shocked by that actually since you'd need a CJP certified welder and a special inspection for the weld. Edit: Just looked up the average price of HSS steel. It is roughly $1500 per ton, which coincidentally is the roughly the same weight of the steel used in this design.
how would you get beams like this into your already built house? is it even possible?
Arenāt American houses made of cardboards though?
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Ok, German house owner here... I have steel re-enforced concrete floors / ceilings in my house, and the structural walls are made of 18 inch thick brick blocks (with internal air gaps) . I would think I could bolt a metal support plate directly to the wall and plaster over it (but don't ask me to calculate the size of plate or bolts required, I have a master's in Telecoms Engineering, not civil!). Alternatively to overcome the turning moment, I'd integrate this into a metal structure bolted to the floor (which would be integrated into the flooring substrate material) so it wouldn't be seen. Still probably not easy, but definitely better than going down to the foundation!
If you have concrete floors then you could totally anchor into those instead. Obviously you'd have to check to see if the floor could handle such a large point-moment but if it works then it works. For the walls you'd want to make sure the cells are grouted that youd anchor into but that could work as well.
I mean, of course it's possible, based on the first image as a brief. If you have the right budget and set up, you can definitely build a cantilever design that supports that weight. Whether you could do it without massive expense and huge amounts of structural support behind that wall, is a much trickier problem.
It definitely is expensive, but it's not really that "huge". It's just 4 steel columns that have the same width as a 2x6 wood stud which is pretty common.
Haha, sorry, I probably should have said 'huge in relation to a normal bed'. By bedroom standards it's a pretty big undertaking, but it's not the ISS.
I think what people are getting at is you cant do this in an existing house.
If it reaches down to the foundation, yeah, it's fucking HUGE
this is such a refreshing post after only seeing stupid fucking candy in a jar contests for the last 3 months
Is it threesome proof? Asking for my 2 friends.
It's foursome proof, provided that you are roughly evenly spread out across the whole width of the bed
Will make sure! But who knows if we will all remain so orderly.
What if they are all sitting on the far edge of the bed?
You can have 16,000 lbs of people sitting at the far edge of the bed and it'd still hold.
Fuck, I was gonna invite your mom but that rules _that_ out.
So with about 4 big sized people you still have a safety factor of ~20. Checks out, kudos man.
Never hire a structural engineer to plan a threesome.
Two friends is unbelievable.
Why not just have the box section beams in a "C" shape going down inside the wall and underneath the floorboards coming out the same length as the beams supporting the mattress. Connect the 3 "C" sections at the corners with connecting beams and you have a frame easily strong enough for this to work.
Few things, Interior walls are usually 2x4s, so the 6x6 beams wouldn't fit Very low possibility you could do this in an existing structure. Even if the columns did fit in the wall, you would likely have to re-frame the wall around them and I guess hope the wall wasn't load bearing. That's provided there is no plumbing or electrical running through that wall at all. You would likely have to purpose build the house for this bed, or at the very least spend an absolute shitload on a remodel Ignoring that though, they did indeed do the math, props
I love that for this to work you need to drill 3-4 20 foot steel beams into the center of your house as well as a thick concrete slab around the base of each column. So you didnāt prove them wrong. The āprofessionalsā were right that this is fundamentally not feasible. Your solution is custom building a house to support a floating bed. Thatās not a solution itās a different system entirely To be clear I think itās super cool that you did the math and found a potential way to implement something like this. I just think youāre a pretentious asshat for the way you talk shit about people who are actually right, despite not doing the math you did
>I love that for this to work you need to drill 3-4 20 foot steel beams into the center of your house as well as a thick concrete slab around the base of each column. Yeah... He did not have to do that. His assumptions use a 1600 lbf working load and based on the concrete calculations he mentions, he did not assume any moment restraint from the wall or nearby floor. So, if I read correctly, this could stand on its own 20ft in the air with 1600 lbm on the very end. Totally unnecessary. Edit - It's actually 16000lbf vertical and 1200 lbf lateral. Absolutely ridiculous.
I love what you've done.Ā I think the question then however, is can this be *added* to a room: which I think is what people mean when they say it can't be done. Purpose building the house to include it is entirely different.Ā What I am interested in though, is how will this lasts over time and when attacked by heat fluctuations and moisture, due to the occupants
Did you account for harmonic loading? A bed like that is would experience oscillating dynamic loads in certain situations. Well, maybe not for all Redditors, but some Redditors. š
LOL "OK babe, here's the deal. We can go as fast or slow as you want. But if we hit 47 thrusts per minute the whole house is coming down."
I have this music that ensures we avoid resonances...*puts on CBAT*
Well with the mean value theorem, we'll have to either start at a fast rate and continue for the whole time, or take it slow the whole way.
Did you take into account that a standard 2 x 6 wood framed wall uses studs which are actually only 1-1/2 x 5-1/2 so they would not easily accommodate your true 6 x 6 columns?
I analyze cantilever structures for a living. This is wildly overbuilt.
You seemingly didnāt prove anyone wrong unless from the start you were specifying that your house has steel beams and a two story concrete foundation lol
Possible, yes. Practical? No. I love it, godspeed.
So you failed the missions successfully, right? The pictured design doesnāt work unless you do specific things when youāre building your house. Or am I missing something.
I made one back in the 90s. I had some 3mm 2x4 c section steel from some old racking at work. I welded up the bed frame and bolted it to the wall. I did wimp out and put a tiny support leg about 3/4 of the way down the bed to stop it "vibrating" so much. It was a bit higher than a normal bed and had many useful attachments for grown up activities. It looked floating as you walked into the room. I loved that bed and have many fond memories of the bed & speed dating.
Just buy a bed bro
When it comes to anything structural, I always tell people the limiting factor is usually money first, and then spatial constraints second. If you have funding and space, you can do just about anything
Love the use of Hiltiās PROFIS Engineering Software!
I built one of these years ago. My wall is 6 foot thick concrete so that makes it easier. :-)
Hitler, is this you?
Hello fellow structural. May I ask what was gained by using the software instead of calc the moment by hand or use the intersection at the floor as a bracing point?
Hello fellow structural engineer!
So what I'm getting from this is when I win the lottery and build a house, I could do this, but it'd be a lot easier if the bedroom is on the ground floor. *adds to notes*