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Shoring load on 5" slab on grade

Shoring load on 5" slab on grade

Shoring load on 5" slab on grade

(OP)
The shoring contractor has indicated diagonal braces to existing basement wall where portions of the first suspended parking floor above the basement slab-on-grade will be temporarily removed during repair of the suspended floor. I calculate that the lateral force the shore will have to take is 21000 pounds. (The diagonal shores are 3 foot on centre; 3 x 7000 = 21,000). The diagonal shores which are at 45 degrees to the horizontal therefore will each apply 21,000 pounds as a vertical load to the 5" slab-on-grade. The diagonal shore has a 10" x 12" x 1/2" steel plate at its base. This load seems too much for a 5" slab-on-grade even if there were 100 pci soil modulus. Any comment?

Also there use to be on the internet a place were you could call up the Westergaard equations and plug in the numbers and it would give the slab stress, but I cannot find that now. Anyone know how I could get to that, or similar?

RE: Shoring load on 5" slab on grade

Have you brought this to the attention of the EOR so he can advise the contractor not to do that?

RE: Shoring load on 5" slab on grade

(OP)
Of course!

Anyone got a spread sheet or know of one for Westergaard, or an internet place that has? I wrote one a long time ago, but I don't entirely trust it for high loads.

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