斜拉桥最大双悬臂阶段主梁剪力滞效应分析

Shear Lag Effects of Main Girder in Cable-stayed Bridge of Longest Double-cantilever's Construction State

以江西某π型截面预应力混凝土斜拉桥为背景,采用有限元方法分析最大双悬臂阶段主梁在自重、索力、预应力及组合作用下的剪力滞效应,研究主梁剪力滞系数分布规律,并通过改变自重、索力、预应力作用效应的组合系数,降低主梁部分截面剪力滞系数.

With a pre-stressed concrete girder cable-stayed bridge with П-shaped cross-section in Jiangxi as an example, this paper studied the shear lag effect of girder at longest double-cantilever＆#39;s construction state under self weight, stay cable forces, prestressing force and combination effect using finite element method, and researched the distribution rule of shear lag coefficient.The shear lag coefficient in the part of the cross sec-tion was reduced by changing the combination coefficient of the self weight, stay cable forces and prestressing force effect.