Fatigue effect for light and medium duty cranes need not be checked if(a) Nsc > 10×10^6 [(27/γmft)/γmt].(b) Nsc 5×10^6 [(27/γmft)/γmt]^2(d) Nsc < 5×10^6 [(27/γmft)γmt].The question was posed to me in an interview for internship.This key question is from Gantry Girders & Design of Industrial Buildings in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Fatigue effect for light and medium duty cranes need not be checked if

1.	Fatigue effect for light and medium duty cranes need not be checked if(a) Nsc > 10×10^6 [(27/γmft)/γmt].(b) Nsc < 5×10^6 [(27/γmft)/γmt]^3(c) Nsc > 5×10^6 [(27/γmft)/γmt]^2(d) Nsc < 5×10^6 [(27/γmft)γmt].The question was posed to me in an interview for internship.This key question is from Gantry Girders & Design of Industrial Buildings in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures
Answer» Correct answer is (b) Nsc < 5×10^6 [(27/γmft)/γmt]^3 The explanation: Fatigue effect for light and medium DUTY cranes need not be checked if normal and shear DESIGN STRESS ranges F ≤ (27/γmft) or if actual NUMBER of stress cycles, Nsc < 5×10^6 [(27/γmft)/γmt]^3, where f = actual fatigue stress range, γmft = partial safety factor for strength, γmf = partial safety factor for material = 1.10.

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