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### NCARB SS Questions - HELP! Posted: Sat Jan 12, 2019 1:54 pm
I went back to the NCARB SS Handbook and went through the questions because I read that they are helpful for PDD.

Can someone please explain how to come up with the answer for this one?

9. If the soil bearing capacity is 3000 psf and the applied load is 48,000 lbs, what is the area of the footing? (Answer: 16sf)

Thanks

### Re: NCARB SS Questions - HELP! Posted: Sat Jan 12, 2019 2:57 pm
Questions #8 and #31 also (attached)

Thank you!

### Re: NCARB SS Questions - HELP! Posted: Sun Jan 13, 2019 5:04 pm
It's all simple algebra.

GEA wrote:Can someone please explain how to come up with the answer for this one?

9. If the soil bearing capacity is 3000 psf and the applied load is 48,000 lbs, what is the area of the footing? (Answer: 16sf)

48000#/3000psf = 16sf

7) Column live load = 80(33.33x25) = 66.67k

31) Wall: (16x40x1.5)150 = 144k, M=144(10)=1440ft-k
Footing: (20x6x2)150 = k, M=36x10=360ft-k
DL: 240k, M=240x10=2400ft-k
Load: 24k, M=24x42=1008ft-k

(1440+360+2400)/1008= 4.2