山区高墩梁式桥动力特性及抗震性能研究

Research on Dynamic Characteristics and Seismic Performance of High Pier Girder Bridge in Mountainous Area

高墩梁式桥在跨越深沟峡谷地形时优势明显,在我国山区公路建设中较为常见。当桥梁位于高地震区时,地震作用复杂,对桥梁的抗震设计要求较高。以山区某高墩多跨梁式桥为工程背景,在现行抗震设计规范的基础上,采用时程分析法对其典型桥跨进行抗震性能分析,得到了高墩联跨梁式桥的地震响应特性和发展规律,分析了有效提高该类桥抗震性能的具体方法。研究成果可为同类桥梁的抗震设计提供参考。

Girder bridge with high piers has obvious advantages in crossing deep gorges,and thus is commonly applied to highway construction in mountainous area of China.When the bridge is located in a high seismic area,the earthquake response is very complicated,and the seismic design is absolutely necessary.In this paper,the seismic performance of the typical span of a high-pier-girder bridge is analyzed by the time-history analysis method based on the existing seismic design code.The seismic response characteristics and development rules of the bridge are obtained,and the methods to effectively improve the integrating stiffness and seismic performance of the bridge are discussed.The results can provide reference for the seismic design of the same kind of bridges.