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In grillage analysis of skew bridge, should a skew mesh be adopted or the transverse members are set orthogonal to the main members?

For skew deck, the transverse members are set orthogonal to the main members to find out the correct moment and deflections. Skew decks develop twisting moments which is more severe for higher skew angles.

The most economical way of designing reinforcing steel is to place the reinforcement along the direction of principal moment.

For skew angle less than 35o, it may not be practical to adopt this approach in the skew region. Instead, the transverse members are kept parallel to the support line so that a skewed mesh is adopted. The use of skew mesh suffers from the demerit that it would slightly overestimate the output of moment and deflections.

Different reinforcing arrangement in skewed bridge

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.


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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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