Question

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 load

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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 1

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.