计算力学学报2012，Vol.29Issue(6)：867-872,6.
箱形梁剪力滞效应分析中的翘曲位移函数及广义内力研究
Study on warping displacement function and generalized internal force in shear lag effect analysis of box girder
摘要
Abstract
Based on the flexural theory of thin-walled box girder, the curve of quadratic parabola is proved to be the reasonable form of the warping displacement function in the shear lag effect analysis of a box girder through investigating the in-plane shear deformation and the bending shear flow distribution in the flanges. The additional deflection induced by shear lag effect is adopted as the generalized displacement. The governing differential equations and the corresponding boundary conditions for shear lag effect of box girder are established by the energy calculus of variations based on the principle of minimum poten- tial energy. The new generalized internal force is defined rigorously,and a simple and convenient formula of stress for shear lag warping is presented which has the same form as the bending stress of elementary beam. A simply supported box girder model is analyzed and the calculated results are in good agreement with the test results, validating the method and formula presented. The generalized moment for shear lag differs from the bending moment in distribution and attenuates quickly. For the simply supported box girder example under concentrated load, shear lag effect increases the mid-span deflection by 12 ~,which should be treated carefully in practice.关键词
薄壁箱梁/剪力滞效应/翘曲位移函数/广义内力/附加挠度Key words
thin-walled box girder/shear lag effect/warping displacement function/generalized internalforce/additional deflection分类
交通工程引用本文复制引用
张元海,康喜东,林丽霞..箱形梁剪力滞效应分析中的翘曲位移函数及广义内力研究[J].计算力学学报,2012,29(6):867-872,6.基金项目
国家自然科学基金 （）
长江学者和创新团队发展计划（IRTll39）资助项目. （）
