混凝土箱梁考虑翼板厚度变化的剪力滞效应  

Shear Lag Effect of Concrete Box Girders Considered Varying Flange-depths

作　　者：蔺鹏臻[1] 杨子江[2] 刘凤奎[2] 冀伟[1] 张元海[2] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州730070 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《土木建筑与环境工程》2013年第1期76-79,116,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金资助项目(51168030;51208242);甘肃省杰出青年基金(1210RJDA009);中国博士后科学基金(2012M521815);长江学者和创新团队发展计划项目(IRT1139)

摘　　要：针对翼板沿截面宽度方向变厚度的混凝土箱梁,利用势能变分原理,建立了可以考虑翼板厚度变化的剪滞效应分析通用方法;针对简支梁和悬臂梁等基本结构体系,系统研究了改变翼板厚度变化对正剪力滞效应、负剪力滞效应和剪力滞变形的影响规律。结果表明,翼板厚度变化对箱梁的截面应力和变形均产生影响。考虑翼板厚度变化对计算结果的影响可达15%。According to concrete box beam which flanges depth varying along the orientation of cross section, using variational principle of potential energy, new analysis method of shear lag is proposed for single cell concrete box beam. For simply supported girders and cantilever girders, general analysis of varying flange-depths influence on positive and negative shear lag effect and deflection have be done. It＇s shown that varying flange-depths have influence both on sectional stress and deflection. Considering the varying flange-depths have effect on the calculation results of up to 15%.

关 键 词：箱梁桥 翼板变厚度 剪力滞效应 变分原理 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]