The critical bending compressive stress in the extreme fibre of a structural steel section is 1000 MPa. It is given that the yield strength of the steel is 250 MPa

Q. The critical bending compressive stress in the extreme fibre of a structural steel section is 1000 MPa. It is given that the yield strength of the steel is 250 MPa, width of flange is 250 mm and thickness of flange is 15 mm. As per the provisions of IS:800-2007, the non-dimensional slenderness ratio of the steel cross-section is

(A) 0.25

(B) 0.50

(C) 0.75

(D) 2.00

Ans: 0.50

Solution:

Given, Yield stress of steel (fy) = 250 N/mm2

Critical bending compressive stress in the extreme fiber (fcrb) = 1000 N/mm2

The non-dimensional effective slenderness ratio of the steel cross-section as per IS 800:2007 is given by