为探究组合折腹梁桥折形钢腹板与底板外包型结合部受力,通过实体板壳混合有限元模型,分析了连接件剪力和拉拔力分布规律,得到单位长度连接件剪力合力和各子板剪力分担比,提出结合部单位长度连接件剪力计算方法。研究结果表明,由于折形形状的影响,一个标准波段内各子板连接件剪力差异很大,且部分子板连接件出现一定拉拔力;腹板连接件剪力和拉拔力自上而下呈逐渐减小趋势,下翼缘板连接件剪力较小且不存在拉拔力;波形内凹和外凸直板各分担25%的波段剪力,两斜板的剪力分担比存在较大差异,且与该波形所处的梁段位置有关;考虑剪切变形对结合部连接件剪力的增大效应,得到组合折腹梁外包型结合部单位长度连接件剪力计算方法,为外包型结合部连接件抗剪设计提供参考。
Abstract
In order to investigate the shear mechanics of partial encased connection of composite girders with corrugated steel webs, a solid-shell hybrid finite element model was established. The distribution of shear and tensile forces of connectors was analyzed, the resultant shear force per unit length and the ratio of shear bearing of each sub-panel were obtained, and the calculation method of the resultant shear force per unit was proposed. The results show that there are significant differences in the shear force of connectors between each sub-panel due to the corrugation shape, and some connectors at sub-panels are in tension.The shear and tensile force of connectors on the web decrease gradually from top to bottom surface of the bottom slab, and there is no tensile force of connectors at the lower steel, and the shear force of them is small; The concave and convex horizontal sub-panels bear 25% of the shear force in a standard corrugation, and the bearing ratio of the two inclined panels is quite different, which is also related to the position corrugation. Considering the effect of shear deformation on the shear force of connectors, a calculation method of the shear force of the connectors per unit length is obtained, which can be used for the shear design of the connectors in partial encased connections.
关键词
组合桥梁 /
折形钢腹板 /
外包型结合部 /
连接件 /
有限元模拟
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Key words
composite bridge /
corrugated steel webs /
partial encased connection /
shear connectors /
finite element simulation
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参考文献
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脚注
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基金
广西重点研发计划（桂科AB110008,桂科AB22080013）
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