大跨径连续刚构箱梁剪力滞效应分析

Analysis of Shear Lag Effect of Long-Span Continuous Rigid-Frame Box-Beam Bridges

结合荷载等效分解方法 ,首先分析大跨径连续刚构在垂直荷载作用下产生剪力滞后效应的机理 ,其次采用三杆比拟法建立箱梁剪力流平衡微分方程 ,最后结合静载试验实测纵向应力数据 ,分析泸州长江二桥连续刚构主要控制截面的剪力滞系数。

The equivalent load resolution method was used in the study. The mechanism of shear lag effect of long span continuous rigid frame induced by vertical loads are discussed. The shear flow equilibrium equations of the box beam are derived by use of three rod analogous procedure. The shear lag coefficients of the main controlling cross sections of the continuous rigid frame of Luzhou Second Bridge over the Yangzi River are obtained based on static loads measured on site.