斜交箱梁剪力滞效应的弹性分析  

An Elastic Analysis of the Lag Effect of the Shear of a Skew Box Girder

作　　者：任荣旭 卜建清[2] 

机构地区：[1]石家庄铁道大学交通运输学院,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《国防交通工程与技术》2016年第5期16-18,12,共4页Traffic Engineering and Technology for National Defence

基　　金：河北省自然科学基金(E2013210104);河北省高校百名创新人才支持计划(Ⅱ);河北省高层次人才资助项目(A201400213)

摘　　要：斜交箱型梁桥剪力滞效应十分复杂,为在理论求解方面进行完善,通过变分法对其进行弹性求解分析,将斜交箱型梁桥的每项应变能和势能叠加求和,计算得出相应控制方程与自然边界条件,然后运用伽辽金公式对其求出近似解,当斜率无限趋向零时,其结果和直线箱型梁桥的公式相同。计算实例的结果与有限元法结果进行了对比,结果相近,证明该方法能较为准确地反映出斜交箱型梁桥的力学性能。The lag effect of the shear of a skew box girder is very complex. In order to improve the theoretical solution to it, anelastic analysis of it is made by means of the variational method in the paper. Each item of the strain energy and the potentialenergy of the skew box girder is superposed and summated, upon the basis of which the elastic differential equation and theboundary conditions are derived,and then the solution equations are obtained in the light of the Calerkin method. When the sloptends infinitesimally to zero,the results are the same as the formula for the lag effect of the shear of a straight box girder. Whenthe calculated results of practical examples are compared with those by the finite element methods it is found that the solutionsare in good agreement. Thus, it is proved that the analysis method is able relatively exactly to reflect the mechanical performanceof the thin-walled skew box girder.

关 键 词：斜交箱梁 变分法 剪力滞效应 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]