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Which of the following causes web buckling in plate girder?

Which of the following causes web buckling in plate girder? Correct Answer diagonal compression

The principal planes will be inclined to longitudinal axis of the member at high shear locations in the girder web. Along the principal planes, the principal stresses will be diagonal tension and diagonal compression. Diagonal tension does not cause any problem but diagonal compression causes the web to buckle in the direction perpendicular to its action.

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