基于分布参数模型深水隔震连续梁桥地震响应分析方法  

Seismic Response Analysis Method for Deep-water Isolated Continuous Girder Bridge Based on Distributed Parameter Model

作　　者：马安财 刘良坤 谭平[4] 周雨龙 周福霖[2,4] MA Ancai;LIU Liangkun;TAN Ping;ZHOU Yulong;ZHOU Fulin(Gansu Vocational and Technical College of Communications,Lanzhou 730070,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China;Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education,Guangzhou University,Guangzhou 510405,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)

机构地区：[1]甘肃交通职业技术学院,甘肃兰州730070 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]东莞理工学院生态环境与建筑工程学院,广东东莞523808 [4]广州大学工程抗震减震与结构安全教育部重点实验室,广东广州510405 [5]交通运输部公路科学研究院,北京100088

出　　处：《应用基础与工程科学学报》2022年第4期1002-1013,共12页Journal of Basic Science and Engineering

基　　金：甘肃省教育厅青年博士基金项目(2022QB-210);国家重点研发计划项目(2019YFE0112500);国家自然科学基金项目(51978185)。

摘　　要：为高效、快速获得规则深水连续梁桥隔震分析结果,基于带集中参数的分布参数模型Euler梁理论,结合Morison方程简化公式,提出了深水隔震连续梁桥“桥墩-质量”分析模型,推导了相应的频率方程、墩身分布参数和墩顶集中参数有阻尼运动方程,利用振型正交条件对运动方程进行了解耦,提出了相应地震响应分析的振型叠加法.结合一实际深水隔震连续梁桥,通过与SAP2000计算结果对比,验证了该方法的有效性,在此基础上研究了深水隔震连续梁桥的减震性能和水深变化对桥梁隔震效果的影响.结果表明:该方法和有限元方法计算的前5阶频率基本一致,地震响应时程曲线吻合良好;隔震方案可显著提高深水桥梁的抗震性能,地震作用下桥梁支座滞回曲线饱满、耗能效果明显;随着水深不断增加,桥墩内力、位移整体上增大,减震效果越来越明显.In order to effectively obtain the isolation effect of regular deep-water isolated continuous girder bridge, this paper puts forward a “pier-mass” analysis model of deep-water seismic isolation continuous girder bridge based on the Euler beam theory of the distributed parameter model with concentrated parameters and the simplified Morison equation, Both the corresponding frequency equation and damping motion equation of the model with pier distribution parameters and pier top concentration parameters are derived.The mode superposition method of seismic response analysis of the isolated bridge is finally proposed by decoupling the motion equation with orthogonality condition.Applying this method to an actual deep-water isolated continuous bridge, the validity of the method is verified by comparing with the calculation results of SAP2000.On the basis of the work, the seismic mitigartion performance of the deep-water isolated continuous beam bridge and the influence of changes in water depth of the bridge are studied.The results shows that the first 5 frequencies calculated by this method and the finite element method are basically the same, and the seismic response time history curves are entirely consistent with each other.The seismic isolation scheme can significantly improve the seismic performance of deep-water bridges.The hysteresis curve of bridge bearing is full and the energy consumption effect of isolators is obvious.With the increase in water depth, the internal forces and displacement of the bridge pier increase significantly, and the seismic mitigation effect becomes more and more obvious.

关 键 词：深水连续梁桥 桥梁隔震 分布参数模型 动水压力 振型叠加法 地震响应分析 抗震性能 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]