基于响应面法的高铁隔震桥梁地震风险分析  

Seismic risk analysis of high-speed railway isolated bridges based on response surface method

作　　者：张添俊 赵桂峰 马玉宏[1,2] 石岩[2,3] 陈发扬 ZHANG Tian-jun;ZHAO Gui-feng;MA Yu-hong;SHI Yan;CHEN Fa-yang(Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology/Key Laboratory of Earthquake Resistance,Earthquake Mitigation and Structural Safety,Ministry of Education,Guangzhou University,Guangzhou 510006,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学工程抗震研究中心,广东广州510006 [2]广州大学广东省地震工程与应用技术重点实验室/工程抗震减震与结构安全教育部重点实验室,广东广州510006 [3]广州大学土木工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2023年第3期44-52,共9页Journal of Guangzhou University:Natural Science Edition

基　　金：国家重点研发计划资助项目(2019YFE0112500);国家自然科学基金资助项目(51878196,52078150)。

摘　　要：考虑高铁桥梁结构自身和地震动的不确定性,采用SAP2000分别建立隔震与非隔震高铁桥梁模型,运用中心复合设计法建立试验样本,对桥梁结构模型进行非线性动力时程分析,分别建立以墩柱位移延性系数和支座剪切位移为输出的响应面函数。基于拉丁超立方抽样,获得隔震与非隔震桥梁构件的易损性曲线;基于结构易损性和地震所造成的损失分析,得出桥梁结构在其全寿命期内的总费用。研究结果表明:通过中心复合设计法得到响应面函数的方法,可以大幅提高高铁隔震桥梁易损性分析的计算效率;隔震墩柱发生各级破坏的超越概率均明显低于非隔震墩柱,说明摩擦摆隔震支座通过延长结构周期和摩擦耗能对高铁桥梁墩柱起到了很好的保护作用;隔震桥梁全寿命期内地震经济损失、检修费用及全寿命总费用等均低于非隔震结构,说明隔震桥梁在全寿命周期内的经济性好。Considering the uncertainty of the high-speed railway isolated bridges and the ground motion,SAP2000 is used in this paper to establish isolated and non-isolated bridge models respectively.A structure-ground motion sample pair is established by the Central Composite Design method.The nonlinear dynamic time-history analysis of the bridge structure model was carried out,to establish response surface functions with the displacement ductility coefficient of the pier column and the shear displacement of bearings as outputs.Then,based on the Latin Hypercube Sampling method,the vulnerability curves of isolated and non-isolated bridge members were obtained.Based on the analysis of structural vulnerability and seismic loss,the total cost of the bridge structure in its whole life cycle was obtained.The results show the method of obtaining the response surface function by the Central Composite Design can effectively reduce the calculation times and improve the calculation efficiency of vulnerability analysis of bridge structures.The exceedance probability of each damage level of isolated piers is lower than that of non-isolated piers,which shows that friction pendulum bearings play a good role in protecting high-speed railway bridge piers through friction energy consumption.Seismic economic loss,maintenance cost,and total life cost of isolated bridges are lower than those of non-isolated structures in the full life cycle,which shows that the economy of isolated bridges in the full life cycle is good.

关 键 词：响应面法 隔震结构 易损性分析 高铁桥梁 

分 类 号：P315.9[天文地球—地震学]