独柱支承桥梁抗倾覆加固技术研究与应用

Research and Application of Anti-overturning and Structural-reinforcement Technology of Single-column Bearing Bridge

本文针对独柱支承桥梁抗倾覆加固技术展开研究,分析了独柱支承桥梁倾覆破坏机理、破坏形态、破坏特征及抗倾覆稳定的影响因素,总结提炼了独柱支承桥梁的抗倾覆加固方法、施工工艺及要点。以四惠立交北向东匝道桥7-1#桥加固工程为应用实例,通过有限元计算对比分析加固前后桥梁受力情况和抗倾覆能力,发现墩柱加粗及增设可调高单向滑动支座的方法有效,墩柱加粗及增设可调高单向滑动支座可为独柱支承类桥梁抗倾覆加固设计提供参考。

In this paper,a study of anti-overturning reinforcement technology for single-column bearing bridges has been carried out.Then it analyzes the overturning failure mechanism,the failure mode,the failure characteristics and the factors that affect the stability of anti-overturning bridge.The anti overturning reinforcement method,construction technology and key points of single-column bearing bridge are summarized and refined.Taking the reinforcement project of north east ramp bridge 7-1#bridge of Sihui interchange as an example,by means of finite element analysis and comparison of bridge strength and anti-overturning ability before and after reinforcement,it is found that the method of adding one-way adjustable sliding bearing with bollard is effective.It can provide a reference for the anti-overturning reinforcement design of single-column bearing bridges.