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Shear Capacity of HSFG bolts is

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Shear Capacity of HSFG bolts is

(a) μfnekhFo

(b) μfnekhFoγmf

(c) μfnekhoγmf

(d) μfnekhFo/γmf

The question was posed to me during an interview for a job.

My doubt stems from Bolted Connections in chapter Bolted Connections of Design of Steel Structures

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Correct choice is (d) μfnekhFo/γmf

Easiest explanation: Shear Capacity of HSFG bolts is μfnekhFo/γmf, where μf = coefficient of friction(0.55), ne = number of frictional interfaces offering frictional resistance to slip, kh = 1 for fasteners in clearance holes, 0.85 for fasteners in over sized and short slotted holes, γmf = 1.1 (slip resistance designed at service load), 1.25 (slip resistance designed at ultimate load), Fo = minimum bolt tension = Anbf0 , where Anb = net area of bolt, f0 = 0.7fub , fub = ultimate tensile stress of bolt.

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