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本文应用块体有限元法对箱梁扭转、畸变进行了分析。块体有限元法吸取了广义坐标法和有限元法的优点,具有基本参量物理概念明确,推导简洁,计算量小,适用范围广等优点。本文对模型梁,40m钢箱梁在集中荷载和均布荷载作用下的扭转、畸变进行了分析,探讨了隔板数量和厚度的影响。并对24m混凝土梁在摇摆力作用下和在自重作用下三支点的扭转、畸变作了分析。计算结果和模型试验证明此方法是可行的。
In this paper, the torsion and distortion of the box girder are analyzed by using the block finite element method. The block finite element method absorbs the advantages of the generalized coordinate method and the finite element method, has the advantages of clear physical concepts of basic parameters, simple derivation, small calculation amount and wide application range. In this paper, the torsion and distortion of the model beam and the 40 m steel box girder under the concentrated load and uniform load are analyzed, and the influence of the number and thickness of the baffle is discussed. The torsion and distortion of 24m concrete beam under the action of rocking force and three points under the self - weight are analyzed. The calculation results and model tests prove that this method is feasible.