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The value of βb in the equation of design bending strength of laterally unsupported beams for plastic sections is

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The value of βb in the equation of design bending strength of laterally unsupported beams for plastic sections is

(a) 0.5

(b) 2.5

(c) 1.0

(d) 1.5

The question was posed to me in an internship interview.

The query is from Design Strength of Laterally Unsupported Beams topic in portion Design of Beams of Design of Steel Structures

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Correct choice is (c) 1.0

The explanation is: The value of βb in the equation of design bending strength of laterally unsupported beams for plastic and compact sections is 1.0. This constant depends on elastic and plastic section modulus for semi-compact sections.

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