12. Find the maximum vertical shearing force which may be applied to a box beam having the cross section shown without exceeding a horizontal shearing stress of 500 psi.
 

a. 3065 lb
b. 4000 lb
c. 6000 lb
d. 6130 lb
e. 6300 lb

 

tbeam = VQ/Ib

Q = S(ybar i Ai )

Irectangle = bh3/12

 

key