城市公路桥梁抗倾覆验算与加固改造的设计方案研究

Study on Anti Overturning Calculation and Reinforcement Design of Urban Highway Bridge

以成都某公路独柱墩桥梁为背景,通过对实际桥梁发生倾覆时受力特点进行分析,使用通用的桥梁结构计算空间有限元MIDAS/Civil分析软件进行该桥的计算、建模、分析,计算模型为梁格法模型,制定出适用于独柱墩桥梁倾覆稳定性的验算方法,在独柱墩曲线梁桥原有独柱墩上,进行钢结构支撑的添加,在支撑上部,加设2个支座,也就是在1号桥墩和2号桥墩两侧各进行一个支座的加设,在进行该独柱墩曲线梁桥加固后,脱空问题并没有表现在公路I级验算的支座当中,-272.0 kN^272.0 kN的支座3反力增加到420.0 kN。当汽车超载达到3车道公路I级荷载工况组合时,全部支座均未出现脱空现象。给已有独柱墩桥梁的改造和加固以及新建独柱墩桥梁的设计提供参考。

This paper takes Chengdu as the background of a highway bridge with single column pier,based on the actual bridge overturning force characteristics were analyzed,the research of bridge structures using general computational analysis software to calculate,the bridge modeling,spatial analysis of MIDAS/Civil finite element calculation model for grillage model,make the applicable calculation method in the single column pier bridge overturning stability of single column pier in the Qu Xianliang bridge,the original single column pier,add steel support structure,in the upper part of the supporting,adding 2 seats,is also in the 1 pier and Pier 2 on both sides of a support set,in the single column pier bridge reinforcement in highway,I checking,the void phenomenon did not occur all bearing,bearing 3 force from the original-272.0 kN^272.0 kN to 420.0 kN.When the vehicle overload reached 3 lanes highway I load condition combination,all the bearings did not appear cavity phenomenon.It provides reference for the reconstruction and reinforcement of the existing single column pier bridge and the design of the new single column pier bridge.