In Plastic Analysis the Shape Factor for Rectangular Section is

Answer: B. 1.5

In plastic analysis the shape factor for rectangular section is 1.5.

Solution

Shape factor is defined as the ratio of the plastic moment and the yield moment of the section. It is a function of the cross-section form or shape and is represented by S. More shape factor means more reserve strength beyond the yield point to reach the plastic stage.

Shape Factor (S) = Plastic Moment(M_p)/Yield Moment(M_e) =  F_y.Z_p/F_y.Z_e = Z_p/Z_e

Where, 

           Z_p =  Plastic Section Modulus

           Z_e =  Elastic Section Modulus

           F_y  =  Yield Stress

Types of cross section	Shape factor
Rectangular (or)  Square	1.5
Triangular	2.34
Solid Circular	1.7
I section	1.12
Diamond	2
Hexagon	1.6

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