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For gantry girders carrying hand operated cranes, the vertical forces are increased by____ for impact allowance

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For gantry girders carrying hand operated cranes, the vertical forces are increased by____ for impact allowance

(a) 10% of maximum static wheel load

(b) 25% of maximum static wheel load

(c) 10% of weight of crab and weight lifted on the crane

(d) 20% of weight of crab and weight lifted on the crane

This question was posed to me by my school principal while I was bunking the class.

The above asked question is from Gantry Girders & Design of Industrial Buildings in portion Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

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The correct option is (c) 10% of weight of crab and weight lifted on the crane

Easy explanation: For gantry girders carrying hand operated cranes, the vertical forces are increased by 10% of maximum static wheel load  for impact allowance. The lateral forces can be increased by 5% of weight of crab and weight lifted on the crane.

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