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For gantry girders carrying electrically operated overhead travelling cranes, the lateral forces are increased by ____ for impact allowance.(a) 10% of weight of crab and weight lifted on the crane(b) 20% of weight of crab and weight lifted on the crane(c) 25% of maximum static wheel load(d) 50% of maximum static wheel loadThis question was posed to me in quiz.Question is taken 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 (a) 10% of weight of crab and weight lifted on the crane

Best EXPLANATION: For gantry girders CARRYING electrically OPERATED overhead travelling cranes, the lateral forces are increased by 10% of weight of crab for impact allowance and weight lifted on the crane. The vertical forces can be increased by 25% of MAXIMUM static wheel LOAD.



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