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Join Date: Jul 2015
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Slab Bearing Capacity

07/21/2015 6:57 AM

hello ,

can anyone help me please in calculating the bearing of slab which is already existing , but we don't have a drawing for this slab so that we know it is reinforced or not , the slab has is 22 m length and 4m wide , on one side there is a wall and the other there is a beam and a column , the problem is we are installing 15 tons electric panels so we have done many cores in the span of the slab , and we have put 4 (H-shaped) iron columns with a 3.5 span between the columns , so any idea to put more columns or not , or is it safe to put these panels on this slab ?? how i can make it stronger and bearable ?

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#1

Re: Slab Bearing Capacity

07/21/2015 8:02 AM

Frankly, you need to obtain the services of a LICENSED Professional Engineer (Structural) to determine the structural capacity of that concrete slab. PAY THE ENGINEER'S FEE AND DON'T BE A CHEAPO.....CONSIDER IT "INSURANCE AND PEACE OF MIND".

Don't try to "wing it", or otherwise you may overstress to slab, which can lead to it's failure. You may be held accountable in a Court of Law for any and all personal injuries and death, as well as resultant property damage.

We do not perform structural evaluation services here in CR4 Forum.

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#17
In reply to #1

Re: Slab Bearing Capacity

07/22/2015 12:45 AM

Bumper sticker: STRUCTURAL ENGINEERS -- BECAUSE ARCHITECTS DON'T "DO" PHYSICS

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#20
In reply to #17

Re: Slab Bearing Capacity

07/23/2015 5:22 PM

I love it! Now, where can I purchase that bumper sticker? LOL

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#2

Re: Slab Bearing Capacity

07/21/2015 9:30 AM

CaptMoosie's advise is spot on. There are too many variables as well, not just in the obvious structural layout, but also the caliber of the concrete, of which your hired licensed professional may want to take a core sample and perform a Compressive and Flexural Strength test in accordance with any number of ASTM Standards.

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#3

Re: Slab Bearing Capacity

07/21/2015 9:40 AM

Read #1.

Then do exactly as instructed.

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#4

Re: Slab Bearing Capacity

07/21/2015 9:42 AM

Thank thank thank guys.

Hopefully, he'll take the advice and not fly solo...

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#7
In reply to #4

Re: Slab Bearing Capacity

07/21/2015 1:14 PM

but but....if you go online you can get 10 grand of consulting work for free, right?

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#5

Re: Slab Bearing Capacity

07/21/2015 9:47 AM

what could possibly go wrong?

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#6

Re: Slab Bearing Capacity

07/21/2015 11:35 AM

What, without seeing it for real? Is this some kind of joke posting?

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#11
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Re: Slab Bearing Capacity

07/21/2015 5:24 PM

Sadly, I expect the OP is being paid to ask us how to do their job.

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#14
In reply to #11

Re: Slab Bearing Capacity

07/21/2015 6:04 PM

Possibly.

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#8

Re: Slab Bearing Capacity

07/21/2015 2:31 PM

It seems you've put the cart before the horse....

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#9

Re: Slab Bearing Capacity

07/21/2015 4:37 PM

that pic looks like one of the messes that ISIS left in Palmyra......ruined ruins.

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#10

Re: Slab Bearing Capacity

07/21/2015 4:43 PM

since you did such a great job with providing info on drainage, soil type, compaction, pad thickness, PSI rating on the mix, and square inch/foot of the proposed columns...I'd suggest you step back and reconsider why you're considering this job

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#12

Re: Slab Bearing Capacity

07/21/2015 5:29 PM

I think you need 5,000PSI concrete.

So get a 5,000 pound steel weight that rests on a one inch square base.

Place this 5,000 PSI load on the floor in various locations.

If the floor does not crack, you may proceed.

Be sure to balance the 5,000 pound weight very carefully.

If it falls over on the floor it may break it. The floor, not the weight.

Or read #1 and follow the instructions.

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#13

Re: Slab Bearing Capacity

07/21/2015 5:32 PM

Ahhhh, don't sneeze on it.....

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#15

Re: Slab Bearing Capacity

07/21/2015 9:15 PM

how i can make it stronger and bearable ?

As others have said you must seek professional help.

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#16

Re: Slab Bearing Capacity

07/21/2015 9:17 PM

I have visions that this slab your asking about isn't at ground level either.

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#18

Re: Slab Bearing Capacity

07/22/2015 12:53 AM

Lots of props. Assume the existing structure is unable to carry any load and just use it as a veneer with a secondary support system. Cheap and fast and permanent if they aren't in the way.

if in doubt go crazy.....

Some scaff pipe bracing or stabilisers clamped on as well would be even better.

Just keep doing this on every floor below till you get to ground level with suitable bearing plates where the load goes to the ground.

Start from the bottom up.

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#19

Re: Slab Bearing Capacity

07/23/2015 1:33 PM

I thought I told you to put those panels exactly on center!!

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#21
In reply to #19

Re: Slab Bearing Capacity

07/24/2015 6:40 PM

Rent these appartments... Very cheep.... Please don't play on the walls. Sleep standing up if you like... New sky-lite in every apartment..... open sky-lite for bathing during rainy season.... easy access to your neighbor....Quick access to the parking lot....

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#22
In reply to #19

Re: Slab Bearing Capacity

07/24/2015 7:55 PM

No elevators or stairs!

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CaptMoosie (6); Ed Watts (1); Fredski (3); jack of all trades (2); JavaHead (1); lyn (3); Munster (1); PWSlack (2); RAMConsult (1); SolarEagle (1); Wal (1)

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