常截面悬臂箱形梁负剪力滞效应分析  

Analysis of Negative Shear Lag Effect in Cantilever Box Girder with Constant Depth

作　　者：何黎[1] 陈世民[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074

出　　处：《成都大学学报（自然科学版）》2011年第1期40-43,共4页Journal of Chengdu University（Natural Science Edition）

摘　　要：针对常截面悬臂箱梁在满跨均布荷载下,分别假定翼板纵向位移沿横向按余弦函数分布分布和按三次抛物线分布,采用变分法进行解析,分析剪力滞效应沿常截面悬臂梁梁跨的变化规律.确定了正负剪力滞各自的分布区域,并与有限元分析的结果相比较,结果表明假定翼板纵向位移沿横向按余弦函数分布更加合理.According to the cantilever box girder with constant depth under a uniform load,based on two different hypotheses that thin-walled box beam when bends shift longitudinally with distribution of cubic parabola function and cosine function,calculus of variation was used to analyze shear lag effect subjected to the position along the mean axis of the cantilever box girder.Distribution areas of positive shear lag and negative shear lag were obtained and they were compared with the outcome of finite element analysis only to find the hypothesis that thin-walled box beam shift longitudinally with distribution of cosine function is more reasonable.

关 键 词：悬臂箱形梁 剪力滞效应 广义变分原理 余弦函数 三次抛物线 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]