连续刚构桥悬臂施工阶段的预应力剪力滞效应分析

Analysis of Hysteresis Effect of Prestressed Shear at Stage of Cantilever Canstruction of Continuous Rigid Frame Bridge

根据一座主桥为三跨(47m+75m+47m)连续刚构桥的悬臂施工过程,计算分析悬臂施工阶段预应力荷载产生的箱梁剪力滞效应,研究该类桥在整个悬臂施工过程中,每个阶段预应力荷载产生的箱梁剪力滞效应,以及一些关键截面剪力滞效应的变化规律;结果表明,在悬臂施工过程中,悬臂预应力束会对箱梁产生正负剪力滞效应,且负剪力滞效应较大。

In terms of process of cantilever construction of continuous rigid frame bridge with main bridge of 3 spans（47 ＋ 75 ＋ 47m） , the paper calulates and analyzes the hysteresis effect of box beam shear produced by prestressed load at stage of cantilever construction and studies the hysteresis effects of box beam shear,which are formed by prestressed load, at every stage as well as the changing laws of hysteresis effects of some key sections shears, Resuits make clear the prestressed bars of cantilever will yield hysteresis effects of positive and negative shears on the box beam but the negative shears ones are larger in the course of construction of cantilever.