独柱墩弯桥的抗倾覆、抗扭曲及其计算分析

本文根据工程的实际经验,对独柱墩弯桥倾覆进行了两种不同破坏形态的区分—倾覆与扭转。现行弯桥的倾覆计算方法是通过曲线梁法或梁格法建模,通过程序计算是否有支座出现拉力,并据此判断桥梁是否倾覆。这种计算方式并没有对倾覆与抗扭作出区分,且其采用的边界条件与桥梁倾覆的实际边界条件不符。针对目前惯用的支座反力法计算倾覆,本文借鉴工民建规范,利用倾覆矩与抗倾覆矩之比的抗倾覆计算方法,提出了倾覆矩比法来计算弯桥倾覆的方法。

Overturning and Torsion Calculation Analysis of the Curved Bridge with Single Column Pier

According to the practical experience in engineering,this papaer made a distinction between two different failure modes of single column pier of curved bridge collapse,that is overturning and torsion failure.The current overturning calculation method of curved bridge is through the curved beam method or the grillage model,and the mount tension is calculated by program,and then the bridge is judged whether it collapses.This calculation does not make a distinction between the overturning and torsion,the actual boundary conditions and bridge overturning＇s boundary conditions don＇t match.To support the conventional force method,refering to civil code and using the overturning moment ratio of anti overturning calculation method,overturning moment ratio method of curved bridge is proposed.