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The maximum wheel load is obtained when(a) crane crab is farthest to gantry girder(b) crane crab is closest to gantry girder(c) crane crab is not attached(d) crane crab is at mid spanI had been asked this question in my homework.This interesting question is from Gantry Girders & Design of Industrial Buildings topic in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Answer»

Correct choice is (b) crane crab is closest to GANTRY girder

Explanation: The maximum wheel load is obtained when crane crab is closest to gantry girder. The crab in such position on the crane girder GIVES maximum reaction on the gantry girder. The VERTICAL reaction of crane girder is transferred through its TWO wheels on to the gantry girder. Therefore, the maximum wheel load is half of this reaction. This maximum wheel load is then increased for impact and used for design of gantry girder.



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