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IS 800 permits bolt holes in the flanges to be ignored when

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+2 votes
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in Design of Steel Structures by (962k points)
IS 800 permits bolt holes in the flanges to be ignored when

(a) 0.9fuAnf/γm1 ≤ 2fyAgf/γm0

(b) 0.9fuAnf/γm1 ≤ fyAgf/γm0

(c) 0.9fuAnf/γm1 ≥ fyAgf/γm0

(d) 0.9fuAnf/γm1 ≤ 0.5fyAgf/γm0

The question was posed to me during an online exam.

My question comes from Design Strength of Laterally Supported Beams topic in portion Design of Beams of Design of Steel Structures

1 Answer

+1 vote
by (1.1m points)
Correct answer is (c) 0.9fuAnf/γm1 ≥ fyAgf/γm0

Easiest explanation: IS 800 permits bolt holes in the flanges to be ignored when the tensile fracture strength of flange is at least equal to tensile yield strength i.e. when 0.9fuAnf/γm1 ≥ fyAgf/γm0  or (Anf/Agf) ≥ (fy/fu)x(γm1 /γm0)x(1/0.9), where Anf/Agf = ratio of net area to gross area of tension flange, fy/fu  = ratio of yield stress to ultimate stress of material, γm1 /γm0  = ratio of partial safety factors against ultimate stress to yield stress.

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