a. The design of structural beam members mainly involves the factored moment, th

Question

a. 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. b. The plastic moment, M_p, is the ultimate stress, F_u, times the plastic section modulus, Z. c. Beams with an unbraced length greater than the length, L_r, typically experience elastic buckling failure. d. The strength reduction factor, Phi, for bending members in the LRFD method is1.0 for Zone 1 and 0.9 for Zones 2 and 3. c. The Shape Factor is defined as M_y divided by M_p (M_y/M_p).

Explanation / Answer

1(a)-yes it's true because of factor moment Mu=M×fos

God=factor of safety

1(b)-false,bcs of Mu=fu×Z

and MP=fy×Zp

1(c) yes it's true, bcs actual length is greater then of that

1(D) -true as per AISC

1(e)-false , shape factor=MP/My

Or. Shape factor=Zp/Z

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