a) μ_fn_ek_hF_o
b) μ_fn_ek_hF_oγ_mf
c) μ_fn_ek_hoγ_mf
d) μ_fn_ek_hF_o/γ_mf

Answer: d
Explanation: Shear Capacity of HSFG bolts is μ_fn_ek_hF_o/γ_mf, where μ_f = coefficient of friction(0.55), n_e = number of frictional interfaces offering frictional resistance to slip, k_h = 1 for fasteners in clearance holes, 0.85 for fasteners in over sized and short slotted holes, γ_mf = 1.1 (slip resistance designed at service load), 1.25 (slip resistance designed at ultimate load), F_o = minimum bolt tension = A_nbf₀ , where A_nb = net area of bolt, f₀ = 0.7fub , f_ub = ultimate tensile stress of bolt.