基于监控数据的中承式拱桥吊杆更换及钢纵梁加固方案研究

Research on Suspender Replacement and Steel Longitudinal Beam Reinforcement Scheme for Half-Through Arch Bridge Based on Monitoring Data

摘要:

针对早期设计与施工局限导致吊杆拱桥在重载交通作用下吊杆疲劳损伤突出、服役寿命缩短，以及部分无加劲纵梁结构安全储备不足、事故风险较高的工程难题，提出系统性维修加固解决方案。以浙江某中承式劲性骨架拱桥为工程背景，围绕吊杆更换与钢纵梁增设全过程，构建涵盖关键参数选取、监控方法设计及监测结果分析的完整技术体系。实际工程验证表明，该方案各项控制指标均满足设计要求，结构安全性与耐久性显著提升，可为同类型桥梁维修加固提供技术参考。

Abstract:

Aiming at the engineering problems and difficulties faced by early design and construction limitations, such as prominent fatigue damage to the suspenders and shortened service life of the suspender arch bridges under heavy traffic, as well as insufficient safety reserves and high accident risks in some unstiffened longitudinal beams, a systematic maintenance and reinforcement solution is proposed. Taking a half-through stiff skeleton arch bridge in Zhejiang as the engineering background, focusing on the whole process of suspender replacement and steel longitudinal beam addition, the technical system containing the selection of key parameters, design of monitoring methods and analysis of monitoring results is constructed. The practical engineering verification shows that all control indicators of the scheme meet the design requirements, and the structural safety and durability are significantly improved, which can provide technical reference for the maintenance and reinforcement of similar bridges.