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针对V撑结构受力复杂的问题,以大黑河岛蝶形拱式连续梁桥为工程背景,采用先整体后局部的分析方法,分别建立整体分析和V撑局部分析有限元模型,根据整体模型分析中在各荷载工况下的计算结果,分析局部模型中V撑关键部位的应力分布。对V撑在大夹角(115.6°)、结构自重及预应力影响下的局部应力进行数值模拟,揭示其变化规律。结果表明:斜撑底部截面受力最不利,且应力分布不均匀,应当予以加强,并给出了结构加强的参考意见。
Aiming at the complicated bearing problem of V-support structure, taking Dahehe butterfly-shaped arch continuous girder bridge as the engineering background, the whole post-local analysis method is used to establish the finite element model of the whole analysis and V-support local analysis respectively. According to the overall model In the analysis, the calculation results under each load condition are analyzed, and the stress distribution in the key part of the V-brace in the local model is analyzed. The local stress of V-brace at large angle (115.6 °), self-weight of structure and prestressing force are numerically simulated to reveal its variation law. The results show that the bottom of the diagonal brace has the most unfavorable stress and the stress distribution is not uniform, so it should be strengthened, and the reference opinion of strengthening the structure should be given.