考虑预应力的大跨径RC拱桥悬浇阶段关键参数影响效应分析

Analysis of Key Parameter Impact Effect in Suspension Stage of Long-span RC Arch Bridge Considering Prestress

对比分析了预应力效应对悬臂浇筑拱桥施工过程中拱圈截面应力、变形、索力、塔偏及局部应力等关键因素的影响。计算结果表明:预应力效应可有效降低截面应力峰值,改善截面受力,同时在一定程度能增大拱圈刚度,减小扣锚索应力幅,预应力效应对塔偏没有显著影响,实际工程中可不考虑。

This paper compares and analyzes the influence of prestress effect on key factors such as stress,deformation,cable force,tower deflection and local stress of arch ring during construction of cantilever cast arch bridge.The calculation results show that the prestressing effect can effectively reduce the peak value of the section stress and improve the stress of the section.At the same time,it can increase the stiffness of the arch ring and reduce the stress amplitude of the anchor cable.The prestress effect has no significant effect on the tower deflection.It is not necessary tot be considered in actual engineering.