The existing flexural analysis methods of corrugated steel web composite box girders are either inaccurate due to thoughtlessness of the influencing factors, or complicated due to excessive consideration of the influencing factors. In this study, a flexural displacement model of composite box girder considering both the accordion effect and shear deformation of web and the shear lag effect of flange is proposed. According to the internal force balance condition, the complex flexural models of a composite box girder are decoupled into three independent simple flexural states: Euler–Bernoulli beam flexure satisfying the quasi-plane assumption, flexure of equivalent web deformation, and flexure of shear lag of flange. Based on the flexural theory of the thin-walled beam, the generalized internal force system and beam-type finite element model was established corresponding to each flexural state. The results of numerical examples show that the proposed method has high solution accuracy and can directly obtain the displacement and internal force of each flexure deformation. The moment results show that the generalized moment has a peak value at the point of shear discontinuity, and increases or decays rapidly near it.

现有的波形钢腹板组合箱梁受弯分析方法要么没有考虑影响因素而不够准确，要么过于考虑影响因素而过于复杂。本文提出了一种同时考虑手风琴效应、腹板剪切变形和翼缘剪力滞效应的组合箱梁弯曲位移模型。根据内力平衡条件，将组合箱梁的复杂弯曲模型解耦为三个独立的简单弯曲状态：满足准平面假设的欧拉-伯努利梁弯曲、等效腹板变形弯曲和剪力滞弯曲。法兰。基于薄壁梁的弯曲理论，建立了对应于各弯曲状态的广义内力系统和梁型有限元模型。数值算例结果表明，该方法求解精度较高，能够直接获得各弯曲变形的位移和内力。弯矩结果表明，广义弯矩在剪切不连续点处出现峰值，并在该点附近迅速增大或衰减。