Find the number of HSFG bolts of diameter 20mm, grade 88 for connection of member carrying factored tensile load of 200kN when no slip is permitted.(a) 5(b) 4(c) 3(d) 2This question was posed to me during an interview for a job.Query is from Bolted Connections topic in section Bolted Connections of Design of Steel Structures

Find the number of HSFG bolts of diameter 20mm, grade 88 for connectio

1.	Find the number of HSFG bolts of diameter 20mm, grade 88 for connection of member carrying factored tensile load of 200kN when no slip is permitted.(a) 5(b) 4(c) 3(d) 2This question was posed to me during an interview for a job.Query is from Bolted Connections topic in section Bolted Connections of Design of Steel Structures
Answer» The correct answer is (b) 4 For explanation I would say: Fo=0.7fubAnb=0.7x800x0.78x(π/4)x20^2x10^-3=137.22 kN Assume μf=0.5, ne=1, KH=1 Slip RESISTANCE of bolt = μf ne kh Fo/1.25 = 0.5x1x1x137.22/1.25 =54.88 kN Number of bolts required = 200/54.88 = 3.64 = 4(approximately).

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