摘要
以一座铅芯隔震橡胶支座简支梁桥为例,建立全桥有限元数值学模型进行非线性动力时程分析,通过加速度反应谱曲线拟合得到7条地震波,研究地震能量法及减震率法在隔震桥梁中的应用情况及其对桥梁结构隔震效果的影响。结果表明:地震能量法可对全桥的隔震耗能进行整体性分析,不同铅芯隔震橡胶支座隔震耗能的差异较小,无法准确评价铅芯隔震橡胶支座的隔震效果;减震率法可以对铅芯隔震橡胶支座隔震效果及桥墩地震响应进行定性评价,铅芯隔震橡胶支座的水平刚度及铅芯屈服力越大,桥墩的地震响应越小,隔震效果越好。在支座满足承载能力的前提下,桥梁结构体系的隔震耗能分析可采用地震能量法,分析铅芯隔震橡胶支座的隔震效果时则采用减震率法,将两者结合起来既可对桥梁结构进行整体的隔震耗能分析,又可对桥梁结构构件进行局部的隔震效果分析。
Taking a simple supported girder bridge with lead rubber bearing isolation as an example,the finite element numerical model of the whole bridge was established for nonlinear dynamic time history analysis.Seven seismic waves were obtained by fitting the acceleration response spectrum curve.The application of seismic energy method and damping ratio method in isolated bridges and their influence on the isolation effect of bridge structures were studied.The results show that the seismic energy method can be used to analyze the isolation energy consumption of the whole bridge.The difference of isolation energy consumption of different lead rubber bearings is small,so the isolation effect of lead rubber bearings can not be accurately evaluated.The damping rate method can qualitatively evaluate the isolation effect of lead rubber bearings and the seismic response of piers.The greater the horizontal stiffness and yield force of lead rubber bearings,the smaller the seismic response of piers,and the better the isolation effect.On the premise that the bearing meets the bearing capacity,the energy method can be used to analyze the isolation energy consumption of the bridge structure system,and the damping ratio method is used to analyze the isolation effect of the lead isolation rubber bearing.Combining the two methods can not only analyze the overall isolation energy consumption of the bridge structure,but also analyze the local isolation effect of the bridge structural members.
作者
彭刚辉
姚国文
贾宏宇
郑史雄
李世亚
PENG Ganghui;YAO Guowen;JIA Hongyu;ZHENG Shixiong;LI Shiya(The Engineering&Technical College,Chendu University of Technology,Leshan Sichuan 614000,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道建筑》
北大核心
2022年第6期82-86,共5页
Railway Engineering
基金
国家自然科学基金(52178169,52178273)
四川省科学技术厅省级科技计划项目(2019YJ0243)
乐山市重点科技计划项目(20GZD042)。
关键词
简支梁桥
铅芯隔震橡胶支座
地震能量反应方程
减震率
非线性动力时程法
simply supported girder bridge
lead rubber bearing isolation
seismic energy response equation
damping ratio
nonlinear dynamic time history method
