等截面薄壁箱梁剪力滞效应的能量变分法解  

Energy-Variational Method of Shera Lag Effect in Constant Section Thin-Walled Box Girder

作　　者：邹永红[1] 杨华[1] 赵华 达帆[1] 

机构地区：[1]中国市政工程西南设计研究院,成都市610081 [2]成都市公路规划勘察设计院,成都市610035

出　　处：《公路》2007年第3期65-68,共4页Highway

摘　　要：在用能量变分法求解薄壁箱梁的剪力滞问题时,不同于以往假设箱梁的上顶板、悬臂板和下底板具有相同的纵向位移转角差函数,采用了三个不同的纵向位移转角差函数来反映薄壁箱梁不同宽度翼板的剪滞变化幅度,通过变分原理建立了薄壁箱梁弯曲变形的控制微分方程,并获得相应的解析解。结果与采用相同位移差函数的解析解和ANSYS有限元计算进行比较分析,验证了本文方法更合理。In this paper, the shear lag effect in the thin-walled box girder are analyzed with energyvariational principle, considering three longitudinal displacement functions for constant section box girder with varying depth other than the same longitudinal displacement functions at the top, cantilever flanges and foot. On the basis of the energy-variational principle, the governing differential equations are derived and the closed-form solutions of the equations are obtained. The results show that the new method is more effective compared with that obtained from the same longitudinal displacement functions method and ANSYS.

关 键 词：薄壁箱形梁 剪力滞效应 能量变分原理 

分 类 号：U441[建筑科学—桥梁与隧道工程]