The shape factor for a rectangular section is 1.5.
Shape factor is defined as the ratio of plastic moment capacity to its yield moment capacity.
Shape factor=Plastic moment capacity/Yield moment capacity
Shape factor represents the strength of a section after its yielding.
Where ZP and Ze are the plastic section modulus and elastic section modulus of the section respectively.
Value of shape factor for the different sections:
Solid circular section
Thin hollow tube
Note: More value of shape factor represents that section can withstand more stresses after its yielding. Hence, the shape factor for a rectangular section is 1.5.
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