Question

The value of design bending compressive stress fbd is

(a) XLT fy

(b) XLT fy /fy

(c) XLT fy fy

(d) XLT /fy

I got this question in class test.

This interesting question is from Design Strength of Laterally Unsupported Beams in division Design of Beams of Design of Steel Structures

Answer 1

Right option is (b) XLT fy /fy

Explanation: The value of design bending compressive stress fbd is XLT fy /fy, where XLT is bending stress reduction factor to account for lateral torsional buckling, fy is yield stress, fy is partial safety factor for material (=1.10).