单边索斜塔钢—混凝土结合梁斜拉桥塔梁根部应力分析

Stress analysis of tower-beam joint of inclined tower cable-stayed bridge with steel-concrete girder

采用板 (壳 )、梁及三维实体单元相结合 ,对长沙市浏阳河洪山庙大桥塔梁根部区域进行空间有限元分析。分析表明 :主梁根部过渡段钢箱梁及混凝土的应力满足规范的限值要求 ,行车道板的剪力滞效应明显 ,徐变对主梁应力的分布影响显著 ;塔根部混凝土在施工过程及运营阶段均处于全截面受压状态 ,与试验结果相比较 。

Stress distribution of tower beam joint region of the Liuyanghe bridge is analysed by use of the spatial FEM with the shell,beam and brick element.There are following conclusions according to the analysis: the stress values of the steel girder and the concrete in the joint region meet the prescript of the code; there exists obvious shear lag effect on the deck; creep has an important effect on the distribution of girder's stress; the concrete of the joint region stays compressed status of whole section not only under construction but also under service, and the theoretic analysis and the test result have good agreement on some degree.