Question

The value of βb in the equation of design bending strength for plastic section is given by

(a) 1.5

(b) 2.0

(c) 0.5

(d) 1.0

I have been asked this question during an internship interview.

Enquiry is from Design Strength of Laterally Supported Beams in section Design of Beams of Design of Steel Structures

Answer 1

Right answer is (d) 1.0

To elaborate: The value of βb in the equation of design bending strength is 1 for plastic and compact sections. The value of βb in the equation of design bending strength for semi-compact section depends on section modulus.