A simple supported beam 6m long is composed of two C200x28 channel RIVETED FRONT TO FRONT . What uniformly distributed load can be carried in addition to the weight of the beam w/o exceeding a flexural stress of 125MN/m^2 if:
a) The web are vertical
b) the web are horizontal
Other Given: mass= 27.9kg/m, Ix= 18.2x10^6,Iy=0.825x10^6,A=3560mm^2