Based on the analysis of the shear warping deformation state,the lateral displacement mode for flanges of a box girder was proposed by comprehensively applying the generalized coordinate method,the coordination conditions of shear warping deformation and equilibrium differential equations.Based on the principle of minimum potential energy sta-tionary value,an analytical solution for shear lag in box girder was derived considering the influence of lateral displace-ment of flanges.By introducing the difference ratio of the influence of the lateral displacement of flanges on the shear lag,the influences of the section parameters and the end restraint condition on the difference ratio for shear lag were ana-lyzed in detail.The numerical analysis shows that the lateral displacement of flanges has a certain weakening effect on the shear lag,and the longitudinal stress considering the lateral displacement is better consistent with the finite element solution and measured values.The larger the span width ratio and height width ratio,the smaller the difference ratio for shear lag.The larger the width of cantilever plate,the smaller the difference ratio for shear lag coefficient.The stronger the end restraint conditions,the steeper the distribution curve of shear lag difference ratio.When the end restraint condi-tions are strong,the influence of lateral displacement should be considered.
关键词
箱梁/剪力滞/翼板横向位移/截面参数/梁端约束条件
Key words
box girder/shear lag/lateral displacement of flanges/section parameters/end restraint condition
维普
万方数据