强震区大跨高墩连续梁桥抗震性能研究

Study on Seismic Performance for Long Span and High Pier Continuing Girder Bridges in Severe Earthquake Region

大跨度高墩连续梁桥的抗震设计,特别是在高强度地震作用下的抗震设计,目前尚无规范可遵循。以国外某大桥为例,建立了全桥的动力分析模型,计算了结构的动力特性和地震响应,针对大桥在强震作用下主梁位移反应过大以及对支座抗剪要求过高的特点,讨论了采用粘滞阻尼器和双曲面球型减隔震支座的减隔震效果,研究结果表明这些措施是有效的,可为同类大跨高墩连续梁桥的抗震设计提供参考。

At tresent, there is no seismic design code for long span and high pier continuing girder bridges, especially under severe earthquake. In this paper, a foreign bridge was taken as an example. The dynamic model of the bridge was introduced. Dynamic characteristics and seismic responses were analyzed. In allusion to the characteristics of too large displacement response of main girder and high demand of support resisting shear force, combination effect to adopt viscous damper and isolated support was discussed herein. The results show that these measures are effectual. This may be a reference for the seismic analysis of similar long span and high pier continuing girder bridges.