House floor post on exterior foundation wall 1

[magicming]

Hi there,

I saw it a couple of residential houses design drawings. The designer used steel beams (like W10x45, W12x50, even W14x90) for the second floor load and one end of beam was supported by steel column (HSS 4"x4"x1/4"). However, the column was placed at the exterior foundation wall. I am roughly guessing the load on column might be 20,000 lbs or higher. The foundation wall was 10" thick and the footing was 16"wide and 8" deep. And there was no extra reinforcement in the foundation wall. My question is that is it safe to design like this? I am in Toronto, the house I saw is a two floor residential building with a nine foot height basement. I don't see that often so I think it is bold to do so. Or maybe my experience is not sufficient enough coz I am into residential design for a year. If this is safe, it will be very helpful to do many designs with aesthetic interior.

 

[magicming]

@jayrod12, yes, it is. The designer used the foundation wall to support the steel posts, didn't increase the loading area. It completely relied on the foundation wall to spread the high point loads from posts.

 

[phamENG]

so how's your analysis of the condition coming along?

 

[magicming]

@phamENG, didn't get a chance to do that yet

 

[PlinkoEng]

That answer is completely dependent on the soul bearing pressure, the concrete strength (2500 PSI? 4000 PSI?) and the height of the stem wall.

I can tell you with certainty it would be a huge problem in my usual regions.

Edit: is this a retaining wall?!? Obviously very location dependent but if it is then that footing is crazy small. In most of my regions the maximum soil bearing pressure without a soil test is 1500 PSI. Just the weight of the wall (1125 plf) would have that footing at like 65% utilization with our bearing pressure.