轻轨铁路站桥结构体系抗震分析与隔震研究

Seismic analysis and isolation for station-bridge structures of light railways

本文结合地处高烈度地震区的天津轻轨工程,对轻轨铁路站桥结构体系进行抗震分析,并探索减轻其地震灾害、提高其抗震能力的隔震措施。研究结果表明,按照现行有关抗震设计规范规定的反应谱值设计的站桥结构体系的抗震安全性存在不足,设计必须按工程建设场地地震危险性评价给定的反应谱值对站桥结构体系进行时程分析,才能保证轻轨铁路的抗震安全性。通过在车站建筑与高架桥梁之间的连接部位安装新近研制的SMA复合橡胶支座隔震装置,可以有效地提高轻轨铁路站桥结构体系的抗震能力。

In this paper, associated with Tianjin light railway located at high seismic intensity area, the seismic (analysis) for station-bridge structures is performed and the isolation is investigated to reduce its earthquake hazard and improve its seismic behavior. The research results show that, the seismic safety of the station-bridge structures designed according to the specified response spectra in current codes for seismic design is lower, and the time-history analysis must be carried out based on the given response spectrum from the seismic risk evaluation of engineering construction site, which will guarantee the seismic safety of the light railway. Installing the isolation measure of the SMA-composite rubber bearing developed recently below the orbital beam and at the connection of the station building and the elevated bridge, the seismic behavior of the station-bridge structure could be effectively increased.