摘要
相较于普通场地震,近断层地震作用下结构破坏更加严重。为提升近断层地震动下连续刚构桥的抗震性能,以重庆某连续刚构桥为例,采用仿真方法建立有限元模型,基于Baker小波分析理论确定近断层地震动输入,并针对铅芯橡胶支座和黏滞阻尼器2种减隔震装置的抗震效果进行研究。结果表明:采用减隔震措施后连续刚构桥的自振周期明显增加,一阶周期增幅为18%~31%;相较于减隔震前的地震响应,使用铅芯橡胶支座的结构响应降低21.4%~36.9%,组合使用铅芯橡胶支座与黏滞阻尼器的结构响应降低38.8%~56.9%。
Earthquake damage research shows that structural damage is more severe under near-fault earth-quake action compared to general site earthquakes.To improve the seismic performance of continuous rigid frame bridges under near-fault ground motions,this paper takes a continuous rigid frame bridge in Chongqing as an example,establishes a finite element model using simulation methods,and determines near-fault ground motion input based on Baker's wavelet analysis theory.On this basis,the seismic effects of two types of seis-mic isolation devices,lead rubber bearings and viscous dampers,are studied.The results show that after in-creasing the seismic isolation measures,the natural vibration period of the continuous rigid frame bridge in-creases significantly,with the first-order period increasing by about 18%~31%.Compared with the seismic response before the seismic isolation,the structural response of the bridge with lead rubber bearings is reduced by about 21.4%~36.9%,and the structural response of the bridge with a combination of lead rubber bearings and viscous dampers is reduced by about 38.8%~56.9%.
作者
朱绩超
赵斌
赵帅
刘海明
ZHU Jichao;ZHAO Bin;ZHAO Shuai;LIU Haiming(School of Transportation Engineering,Dalian Jiaotong University,Dalian 116028,China;CMCT,State Key Laboratory of Bridge Safety and Resilience,Chongqing 404100,China)
出处
《大连交通大学学报》
2025年第3期86-93,共8页
Journal of Dalian Jiaotong University
基金
桥梁工程结构动力学国家重点实验室暨桥梁结构抗震技术交通行业重点实验室开放课题(202203)。
关键词
近断层地震
连续刚构桥
减隔震
铅芯橡胶支座
黏滞阻尼器
near-fault earthquake
continuous rigid frame bridge
seismic isolation
lead rubber bearing
vis-cous damper
