大跨径钢管混凝土拱桥的动力性能改造

移动车辆荷载是公路桥梁所承担的主要荷载形式，桥梁性能与服役寿命除依赖于其静力性能外，更依赖于结构在车辆荷载作用下的动力工作性能。钢管混凝土拱桥具有自重轻、强度大、抗变形能力强等优点，但若结构中各构件的组成、刚度、连接方式、布置形式不合理，虽然各项静力指标满足要求，也可能给结构带来严重的动力工作性能问题．结合黑龙江省哈同公路依兰牡丹江大桥的工程实例，针对该桥动力工作性能不足的问题，提出了对其动力性能进行改造的方法。经过改造后桥梁结构的动力工作性能有了很大程度的提高，保证了桥梁的安全性和使用性。

Dynamic Performance Improvement for Steel-tube Confined Concrete Arch Bridge

Moving vehicle load is the main type of load form acting on highway bridge, the performance and service life of a bridge depends on not only the static performance but also the dynamic performance under moving vehicle loads. The steel-tube confined arch bridge has characteristics such as small deadweight, high strength and strong ability to resist deformance. If the rigidity, connection style, arrangement pattren of each member is not designed reasonably, it will cause serious dynamic problem although the static strength can fulfill requirement,and moving vehicles will bring large vibration to the bridge.With the case of Yilan Mudanjiang bridge in Ha-Tong Highway, update method is put forward aiming at making up for the deficiency in the bridge dynamic performance. The dynamic performance of the bridge has improved largely after update, and the safety and service be ensured and the expected objective has been achiered.