huangyhg

modulus of sub-grade reaction
i was given a value of 150 kcf for my modulus of sub-grade reaction.
i've posted about this before, but could anyone give me some guidance?
how does this convert for a 20'x16' combined footing with 2'x2' panels?
please let me know asap.
thanks.
rc
all that is necessary for the triumph of evil is that good men do nothing.
edmund burke

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i am getting that it should come out to 50k/in for each 2'x2' panel
is that just using 87 psi * (24"x24")? to get 50k/in?
isn't there a formula to modify this based on the size of the footing?
rc
all that is necessary for the triumph of evil is that good men do nothing.
edmund burke

i don't know where your 87psi came from, but what i did is this:
the 150 kcf is 150ksf per foot. multiply that by the panel siae of 4sq ft to get 600 k/ft, then divide by 12"per ft to get 50 k/in.
i don't know where your 87psi came from, but what i did is this:
the 150 kcf is 150ksf per foot. multiply that by the panel size of 4sq ft to get 600 k/ft, then divide by 12" per ft to get 50 k/in.
87 psi is = 150 kcf ---> 150,000/12/144 = 86.81 psi
86.81 psi * 24"x24" = 50 kips/in
we just went about it using different starting points. sorry for not making the 87psi clear. all examples i've seen use psi as the units so i wanted to be consistent with that.
rc
all that is necessary for the triumph of evil is that good men do nothing.
edmund burke

isn't there a formula to reduce the modulus first k*1/b then k*(1+0.5(b/l))/1.5?
when does this apply?
rc
all that is necessary for the triumph of evil is that good men do nothing.
edmund burke

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