基于能量法的波形钢腹板箱梁挠度计算

Defection Calculation of Corrugated Box Girders Based on Energy Method

文章基于能量变分原理,通过在纵向位移函数中引入翘曲变形函数以及剪切转角来分别考虑箱梁剪力滞效应和波形钢腹板剪切变形的影响,提出一种波形钢腹板箱梁挠度计算的解析方法;分别针对简支梁作用均布荷载和集中荷载两种工况,推导挠度计算公式,通过与有限元方法的比较验证该方法的准确性,并进行箱梁剪力滞效应和波形钢腹板剪切变形的挠度贡献分析。

Based on energy method, this paper introduced a warping displacement function and a shear rotation in the longitudinal displacement function for considering the effect of shear lag box girder and the shear deformation of corrugated webs and proposed an analytical method for calculating the deflection of corrugated box girders. For two cases of simply supported girders subjected a distributed load and a vertical concentrated load respectively, the vertical deflection of the girders was derived by solving the governing equations. The accuracy of the proposed method was validated with the results obtained by finite element method. And the contributions of shear lag effect of box girder and shear deformation of corrugated webs to deflection were studied.