基于高面压聚氨酯支座的大墩高差连续梁桥抗震分析
Seismic analysis of continuous girder bridge with large pier height difference based on high surface pressure polyurethane bearing
代刚 1陈良军 1于晓涛 2袁涌2
作者信息
- 1. 华中科技大学土木与水利工程学院,湖北武汉 430074;中铁城市发展投资集团有限公司,四川成都 610218
- 2. 华中科技大学土木与水利工程学院,湖北武汉 430074
- 折叠
摘要
本文针对目前抗震设计中的不足,探究了高面压聚氨酯支座在大墩高差连续梁桥中应用的可行性,并分析了其隔震性能,同时基于能量法与信号处理研究了地震波不同特性对使用了新型隔震装置的桥梁地震响应的影响.结果表明,高阻尼支座、铅芯橡胶支座及高面压聚氨酯支座均具有良好的隔震效果.高面压聚氨酯支座对桥墩侧向刚度的调节能力更佳,更加适用于大墩高差桥梁结构.选取多条近断层地震波与远场波进行时程分析,发现布置了新型隔震装置的桥梁在近断层地震波作用下地震响应平均比远场波高30％左右,对速度脉冲较为敏感,且地震响应较大的地震波反应谱均较为饱满且存在多个峰值.
Abstract
This paper investigates the feasibility and analyzes the seismic isolation performance of high surface pressure polyurethane bearings and separated seismic isolation bearings in continuous girder bridges with large pier height difference,and investigates the effect of different characteristics of seismic waves on the seismic response of bridges with new seismic isolation devices based on energy method and signal processing.The results show that the high damping bearing,lead-core rubber bearing and high surface pressure polyurethane bearing all have good seismic isolation effect.The high surface pressure polyurethane bearing has better adjustment of lateral stiffness of bridge piers and is more suitable for bridge structures with large pier height difference.It was found that the seismic response of the bridges with the new seismic isolators was higher than that of the far-field waves by about 30％on average,and more sensitive to the velocity pulse,and the seismic response spectra of the larger seismic response were fuller and had multiple peaks.
关键词
聚氨酯支座/隔震装置/抗震分析Key words
polyurethane bearing/seismic isolation device/seismic analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据