顶板、底板和斜腹板厚度对斜拉桥箱梁剪力滞效应的影响

以株洲建宁大桥斜拉桥为工程背景，用板壳单元模拟箱梁，研究了顶板、底板和斜腹板厚度对斜拉桥箱梁剪力滞效应的影响，通过计算结果的分析和比较，对影响斜拉桥箱形主梁剪力滞效应的顶板、底板和斜腹板厚度进行了参数分析，计算结果表明：在斜拉桥单箱三室主梁中，顶板、底板和斜腹板厚度对顶板剪力滞效应的影响大于对底板剪力滞效应的影响；底板和斜腹板厚度增加均会使顶板剪力滞效应趋于不均匀；在顶板、底板和斜腹板厚度三者变化中，斜腹板厚度变化对于剪力滞效应的影响最为显著．

Influence of top flange, bottom flange and web thickness on the shear lag effect of box girder used in cable-stayed bridge

Many different dimensional finite elementary models,in which the top flange,bottom flange and web of box girder are simulated with shell element,were established on the background of Jianning bridge in Zhuzhou.Parameter analysis of the thickness change of the top flange,bottom flange and web on shear lag effect of box girder was based on the analysis and comparson of the calculated results.The results show that the thickness change of the top flange,bottom flange and web have more influence on the shear lag effect of top flange than that of bottom flange,thickness increase of bottom flange and web can make the shear lag effect intensified obviously,and thickness change of web has most significant influence on the shear lag effect among them for box girder with single box and three rooms used in cable-stayed bridges.