跨汉江连续刚构拱桥静-动力学性能现场试验研究

Research on field measurement mechanical behavior for large span continuous rigid frame arch bridge

依托汉十高铁崔家营汉江特大桥工程建设,开展了大跨连续刚构拱桥受力性能专项测试,对其设计荷载作用下的静态承载性能和高速列车运行条件的动力性能进行评价。采用理论计算与实际监测相结合的方法,分析了静荷载下主梁挠度、拱肋挠度、拱肋和主梁应力、索力增量和支座水平位移,以及桥梁动力特性参数与行车条件的动力响应特征。专项测试结果表明在大跨连续刚构拱桥的各项受力性能良好,满足设计和运营要求。

This study introduces the special testing conducted on the Cuijiaying Hanjiang Extra-large Bridge,a continuous rigid-frame arch bridge on the Hanzhong-Chengdu High-speed Railway.The testing evaluated the bridge’s load-carrying capacity under design live loads and its dynamic performance when trains pass through.Static load analysis combined theoretical calculations with actual monitoring.The main analysis included deflections of the main beam and arch ribs,stresses in the arch ribs and main beam,cable forces increment,and horizontal displacements of the bearings.Dynamic load testing focused on the bridge’s dynamic characteristics and dynamic response.The results of the special testing show that the bridge’s structural and dynamic performance is excellent under the applied test loads,and it meets the design requirements.