Weight of shelves with vinyl concern

Bend over?

 

Duh, remove some songs from it!

 

This is all fine and dandy. But that's not how structure works. Take a Statics or better yet a Strengths of Materials course. Ultimate load is based on cantilevering. The joists span between load bearing supports from underneath. This maximum load in any code would be worst case. If the code states anything, it's an amount that would be safe anywhere in the room. So you design to the worst case. And 67 lbs. can't be right. A person stands within a square foot space. And the average person weighs well over 67 lbs. The greatest load would be the midpoint of the joist. This is where your beam is the weakest because it's cantilevered furthest from the support at either of the ends of the joist. The wall that is adjacent to the shelf, if load bearing would have structure much, much stronger than into the room. But you would have to know which direction joists are placed. If the joists are parallel to the aforementioned adjacent wall, there there could be problems. This is what I would check. There shouldn't need to be any calculations to answer these kinds of questions. The code exists it keep people safe. But building codes aren't perfect. You just have to be smart about things. Normally a long wall in a room isn't going be a non-load bearing one. If it is, there there should be some kind of support under it. Where you get into huge problems with structure would be if the room was set up like a library where shelving stacks extending into the middle of the room. What this amount to is this: it should be safe if the wall is load bearing because the joist are extending the load from the center of the room back to the wall. If the wall isn't loading bearing, there is probably a problem.

 

... which is also true for the OP's situation.

 

There is a layer of plywood or OSB under the particleboard.

 

I don't recall admitting you to our home for an underfloor inspection. When did you do that?

 

Same setup like mine. 1991 construction, 4x8 plywood panel floors with basement cast iron joists supporting the floor above with furniture and a 700 pound baby grand piano- Yamaha. John M.
PS, its the IKEA shelves im concerned about after hearing about their construction.

 

I've taken Static's/Dynamics, Concrete Structures, Etc. I have a masters in engineering. That is exactly how it works.
Code is 40 psf residential. (Attics are less).
his load exceeds that because it is concentrated over a small area.
If spread out over the floor then no issue.
The 40 is design, not ultimate, there is a safety factor.

A 200 lb person may occupy 1 sf (actually 1.5 x 1 is closer, for elevator calcs 2 sf/person is used) but the load is distributed over a larger area. Assume 16" oc joists x 10' long. If he straddles between 2 joists at 5' the average load is 200/(1.33 x 10) = 15 psf Actually lower since the flooring will spread it over other joists.

Each end transfers 100 to the bearing point.
Now as he moves towards a bearing point it's share increases. But average loading does not. But point loading does.

His loading on that section of the floor may exceed code, if he is concerned (he seems to be since he posted) he should get someone to look at it it. Either way no skin off my nose. He asked, I offered my opinion.

btw he is not cantilevered. He supported at each end. If what you mean is if a load is 1/3 from the bearing point it carries 2/3 of the load, yes.

 

The prevailing code in my area is the IRC.
For reference.
Note: Uniformly Distributed Load

 

This was in San Diego. Made the TV news stories I remember.

 

In the US it's National Building Code unless it's a mobile home. Particleboard is an underlayment which is applied over a subfloor (plywood), typically under carpet or vinyl floor covering in the 90's.

 

Cautionary tale but in fairness to the Expedit, that one was assembled incorrectly. The structural supports were installed vertically instead of on the horizontal. Regardless, once full, don't try and move em or lean against em.

 

Well. I'm not in the US, so ...

 

We use the IBC
most do
Description
The International Building Code is a model building code developed by the International Code Council. It has been adopted for use as a base code standard by most jurisdictions in the United States.

some use this, but mostly supplanted
The Uniform Building Code (UBC) was a building code used primarily in the western United States.

 

Hi. Seeing as you're being so generous with your advice, I figured I'd ask a question that I've had for a while.

Assuming the floor below in this case is a basement floor of poured concrete, is it possible to make any general observations about what kind of load that could support before cracking?

I'm just curious, I've always wondered how sturdy basement concrete slabs may be.

 

My intent is not to derail this thread but what’s your point? I think that most people confuse particleboard, Aspenite(brand name), waferboard, OSB and AdvanTech as being the same product and sometimes include plywood. Subfloor and underlayment are also misunderstood.

 

You said NBC, not aware of that Code
Clarification
That's all

 

It's too bad ikea doesn't make cantilevered cubes. Your wall joists will hold any weight of shelved records.

I have 8 very heavy when empty flipper door units hanging on one wall.
They are five feet long and are placed four over four right net to each other. They are loaded with albums.
That's an awful lot of weight hanging on one wall, but 12 years later and nothing has come down.

Here's a pic of just one of the five footers hanging on a floor panel system.



All 8 are hanging on wall track in my office now.

 

Very sturdy downward
Hard to say exactly: age, fc (psi of concrete), any reinforcement, thickness, sub base
But it should be good for at least 500 psf if 4" thick, no steel, 2000 psi fc
Any loading puts it under compression which concrete excels at.

using op's scenario
If you put jacks on it, say 8"x8" baseplate x 4 ~1.8 sq ft
If you jack each 1/4" after contact and assume 1/3 of the load (this can be calculated by the torque required to raise the jack, not germane for our discussion) you have 670/1.8 ~ 370 psf
That imo is not an issue.

keep this in mind
Dry undisturbed clay like soil is good for 2000 psf 14 psi) that is why a tire filled to say 32 psi barely indents it

 

Being such a know it all on the subject I made up an acronym for InterNational Building Code without thinking. Thanks for correcting me. I should have said local building code in my region.