薄壁曲线箱梁考虑材料弹塑性的剪力滞效应  

SHEAR LAG EFFECT FOR THIN-WALLED CURVED BOX GIRDER IN CONSIDERING ELASTICS AND PLASTICS OF MATERIALS

作　　者：陈玉骥[1] 罗旗帜[1] 刘光栋[2] 

机构地区：[1]佛山科学技术学院土木工程与建筑学系,广东佛山528000 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《工程力学》2008年第4期21-25,31,共6页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50378019);广东省自然科学基金资助项目(034066)

摘　　要：依据势能变分原理,推导了薄壁曲线箱梁考虑翼缘应力剪力滞效应和材料非线性的刚度矩阵。采用样条有限点法和截面内力塑性系数法对薄壁曲线箱梁的弹塑性问题进行了求解。研究表明:弯曲剪力滞效应系数的非线性特征较挠度和扭转角的要明显;在荷载达到一定程度时,随荷载的增加,箱梁截面上的翼缘应力的分布逐渐均匀。该文的方法简单、实用,并可推广于变截面、变曲率薄壁曲线箱梁的计算。By mean of potential variational principles, the stiffness matrix of thin-walled curved box girders in considering the shear lag effect of flange＇s stress and material nonlinearity is obtained. The elastic and plastic problem of thin-walled curved box girders is solved with the spline finite point method and the section internal force plastics coefficient method. The research shows that the nonlinear property of the moment shear lag coefficient is more obvious than that of the displacement and torsion; when the load reaches certain values, the distribution of flange＇s stresses in the section of box girders become more and more uniform with the increasing of the load. The proposed method is simple, practical and could be also used to calculate thin-walled curved box girders with the varying section and varying curvature.

关 键 词：曲线箱梁 剪力滞效应 弹塑性分析 样条有限点法 截面内力塑性系数 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]