考虑腹板剪切变形的波形钢腹板组合梁翼缘有效宽度计算方法

Calculation Method of Effective Flange Width of Composite Girders with Corrugated Steel Webs Considering Web Shear Deformation

波形钢腹板组合梁在竖向荷载作用下会产生较大的腹板剪切变形,从而影响梁的内力分布和剪力滞效应,但目前针对该类型梁的剪切变形还缺乏理论研究。为此,首先在等高度波形钢腹板组合梁剪力滞效应分析方法的基础上推广至变高度梁,然后借助该方法以一等高度连续梁为对象,计算了欧拉梁理论、铁木辛柯梁理论、实体有限元3种不同内力解情况下的翼缘有效宽度系数,并与有限元法验证结果进行了对比。结果表明,采用实体有限元内力解时精度最高,其次为采用欧拉梁内力解,铁木辛柯梁内力解精度最低。最后以一变高度连续梁为对象,研究了欧拉梁理论与铁木辛柯梁理论内力解情况下的翼缘有效宽度系数,结果表明,腹板剪切变形对变高度梁翼缘有效宽度影响不大。

Composite girders with corrugated steel webs would be yielded to large shear deformation on webs under vertical load,thus the internal force contribution on the beam and the shear-lag effect would be affected,however,the theoretical research on the shear deformation of this kind of beam is lacking.Therefore,first,the analysis method of analyzing the constant-height composite girders with corrugates steel webs is extended to the varying-height condition.Then,the effective flange width coefficient of a constant-height continuous beam based on the internal force calculated respectively by Euler beam theory,Timoshenko beam theory and finite element analysis is studied with this method.The result show that,using finite element analysis to calculate the internal force can obtain the most accurate solution,using Euler beam theory is second and using Timoshenko beam theory is last.Finally,the effective flange width coefficient of a varying-height continuous beam is studied based on the internal force calculated by Euler beam theory and Timoshenko beam theory,the result show that,the shear deformation of the web has little effect on the effective width of the flange of the variable height beam.