连续刚构桥悬臂施工阶段的预应力剪力滞效应分析

根据某三跨连续刚构桥的悬臂施工过程,分析了悬臂施工节段预应力荷载产生的箱梁剪力滞效应以及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。

Analysis of Pre-stress Shear Lag during Construction of Continuous Rigid-frame Box Girder Bridge

According to the structure characters of a typical three-span pre-stressed concrete continuous rigid-frame box girder bridge with single cell, the shear lag of box girder bridge is analyzed in the process of cantilever cast-in-place construction, and changes of shear lag is researched under the load case of pre-stress. According to the results, the positive shear lag and minus shear lag occur in the process of cantilever cast-in-place construction.