The design of structural beam members mainly involves the factored moment, the y
ID: 1711018 • Letter: T
Question
The design of structural beam members mainly involves the factored moment, the yield strength of the steel and the unbraced length of the compression flange. The plastic moment, M_p, is the ultimate stress. F_u, times the plastic section modulus, Z. Beams with an unbraced length greater than the length, L_n typically experience elastic buckling failure. The strength reduction factor, Phi, for bending members in the LRFD method is 1.0 for Zone 1 and 0.9 for Zones 2 and 3. The Shape Factor is defined as M_y divided by M_P (M_y/M_p).Explanation / Answer
1a) True. structural beams mainly designed on the basis of factored moment and yield strength of steel.
1b) True. Plastic moment=F*Z
1c) False. Beams will under go bending failure. It will not have any buckling.
1d) True. It is a constant which reduce the strength in bending members.
1e) False. It is difined by Mp divided by My.