箱梁单元与梁格法在异型桥梁分析中的应用  

Application of a Thin-walled Box Girder Element and Grillage Method in the Special-shaped Bridge

作　　者：卢彭真[1] 张俊平[2] 赵人达[1] 黄海云[2] 

机构地区：[1]西南交通大学土木工程学院．四川成都610031 [2]广州大学土木工程学院,广东广州510006

出　　处：《中山大学学报（自然科学版）》2008年第2期54-57,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：教育部优秀青年教师基金资助项目(教人司[2000]11号)

摘　　要：异型薄壁箱梁桥结构受力行为复杂,用常规的计算理论和分析方法难以准确把握结构的受力行为。为较好把握该结构的受力行为,在普通梁理论的基础上,通过增加自由度的分析法,提出考虑约束扭转、畸变以及剪力滞效应作用的每节点10个自由度的薄壁箱梁空间单元,推导出对应的单元刚度矩阵,并编制相应的有限元程序。同时利用该程序结合空间梁格分析法、普通梁单元法及板壳单元法分别对一典型异型桥梁进行结构分析。理论分析与实测结果比较表明了本单元的有效性和准确性,也说明了空间梁格分析方法是一种简便实用的分析方法。Mechanic behavior of Y-shape thin-walled box girder Bridge structure is complex and can not exactly described with general calculation theory and analytical method. Based on elementary beam theory, a thin-walled box beam analytical element of 10 degrees of freedom of every node was obtained, and stiffness matrix of the element was derived. In addition, a new spatial thin-walled box girder element grillage analysis method was built. A type of Y-shape thin-walled box Girder Bridge structure was analyzed with the elementary beam theory, shell theory and the new method. Comparison of results of theory analysis with experimental data, it is shown that the spatial thin-walled box girder element grillage analysis method is simple and exact.

关 键 词：异型桥梁 增加自由度 刚度矩阵 空间梁格分析 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]