Concrete Floor Slab with compression loading

[daski]

I have a project with 5 levels of below-grade floors, therefore those floor slabs are also under lateral compression loads due to the soil pressure on the basement walls. It is all CIP concrete. Some floors will be 2-way flat slabs others will be one-way with beams. Is there a preferred method for accounting for the compression load, such as moment magnification (ACI 10.10)? Or ACI 14.8, walls with compression and flexure? At the deepest levels the compression loads are in the range of 30 kips per l.f. on a floor slab.

 

[msquared48]

So the wall shoring is only temporary?

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[daski]

That is correct.

 

[hokie66]

The slabs could be checked in the same manner you would check walls carrying gravity loads and also bending. For a 5 storey basement, I think most engineers would deem the compressive stress advantageous, as it is just a bit of prestress, but ignore it in the floor design.