Question

Which of the following is correct regarding gantry girders?

(a) It is laterally supported except at the columns

(b) It is subjected to impact load

(c) It should not be analysed for unsymmetrical bending

(d) It is not subjected to longitudinal load

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Answer 1

The correct option is (b) It is subjected to impact load

Explanation: Gantry girder are different from beams in buildings. It is generally laterally unsupported except at the columns. It is subjected to impact load. It must be analysed for unsymmetrical bending because of lateral thrust from the starting and stopping of the crab. It is subjected to longitudinal load due to starting and stopping of crane bridge itself. They are always simply supported.