Determine LRFD design moment strength for a W14x90 for the u

Determine LRFD design moment strength for a W14x90 for the unbraced lengths below. Assume Cb - 1.0, c-1. a. Lb 10 b. Lb 50

Solution

a) the unbraced length of 10\' is less than L_p of section. L_p of w14x90 = 15.1 ft

Therefore, moment capapcity of W14x90 = plastic section capacity of w14x90 = 574 kip-ft