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Exact distortional behavior and practical distortional analysis of multicell box girders using an expanded method

机译：使用扩展方法的多单元箱形梁的精确变形行为和实际变形分析

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摘要

This paper presents an expanded method for exact distortional behavior of multicell box girders subjected to an eccentric loading. This method decomposes the eccentric loading into flexural, torsional and distortional forces by using the force equilibrium. From the force decomposition, the complex behavior of the multicell box girders can be decomposed and in turn the distortional behavior can be considered independently. Based on the method, a thin-walled box beam finite element, which can be applied to practical distortional analysis of straight multicell box girder bridges, is also developed in this study. The present box beam element possesses nine degrees of freedom per node to consider each separate behavior of multicell box girders. The validation of the present box beam element is demonstrated through a series of comparative studies using a conventional shell element and a box beam element proposed by other researchers. From the independent consideration of exact distortional behavior, the present box beam element unlike shell element will be useful for practicing engineers to easily determine distortional bimoments and stresses of multicell box girders.
机译：本文提出了一种扩展的方法，用于承受偏心荷载的多格箱形箱梁的精确变形行为。该方法通过使用力平衡将偏心载荷分解为弯曲，扭转和变形力。通过力分解，可以分解多格箱形箱梁的复杂行为，进而可以独立地考虑变形行为。在此基础上，还开发了一种薄壁箱梁有限元，可用于多单元平直箱梁桥的实际变形分析。当前的箱梁单元每个节点具有九个自由度，可以考虑多单元箱梁的每个单独的行为。通过使用常规壳单元和其他研究人员提出的箱形梁单元进行的一系列比较研究，证明了本箱形梁单元的有效性。通过独立考虑精确的变形行为，本发明的箱形梁单元与壳体单元不同，将有助于实践工程师轻松确定多单元箱形梁的变形双矩和应力。

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