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What is the maximum vertical deflection allowed for a gantry girder where the cranes are manually operated?

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What is the maximum vertical deflection allowed for a gantry girder where the cranes are manually operated?

(a) L/500

(b) L/700

(c) L/600

(d) L/800

I got this question by my school principal while I was bunking the class.

The query 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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Right option is (a) L/500

For explanation I would say: The vertical deflection of gantry girder where the cranes are manually operated should not exceed L/500, where L is the span of gantry girder. The maximum vertical deflection allowed for a gantry girder where the cranes are travelling overhead and operated electrically upto 500kN is L/750 and operated electrically over 500kN is L/1000. When gantry girders carry moving loads such as charging cars, the deflection should not exceed L/600.

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