Code checking of a box girder diaphragm according to Eurocode

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The behavior of concrete box girder diaphragms is dependent on many factors as placing of the bearings, inclination of the sidewall of the box girder cross-section, the global static scheme of the structure and many more.

The design is based on the analytical method strut and tie, which is mentioned in the Eurocodes. This method is really simplified and unable to check the details for the serviceability limit state. The goal of the article is to introduce the differences between the S&T method and physically non-linear solution based on the finite element computation of the wall model. The advanced method CSFM (compatible stress field method) allows the computation and code-check of the crack width, stress limitation and deflection for short-term and long-term effects.

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