基于系统地震易损性的桥梁隔震支座优化设计  

Optimal design of seismic isolation bearings of bridge based on system seismic fragility

作　　者：万华平 卫志成 苏雷 任伟新 WAN Huaping;WEI Zhicheng;SU Lei;REN Weixin(College of Civil Engineering, Hefei University of Technology, Hefei 230009, China;College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]浙江大学建筑工程学院,浙江杭州310058 [3]青岛理工大学土木工程学院,山东青岛266033 [4]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《地震工程与工程振动》2021年第5期69-78,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发项目(2019YFB2102702);国家自然科学基金项目(51878235,51808307,51778204)。

摘　　要：隔震支座对桥梁抗震有重要意义,优化支座的参数可有效提升隔震效率。以一座三跨连续梁桥为例,建立了考虑桩-土-结构相互作用的有限元模型。将铅芯橡胶支座的特征强度及初始刚度视为优化变量,以最小化桥梁结构的系统地震易损性为目标。通过动力时程分析,得到支座参数对桥梁系统地震易损性的影响规律,确定支座参数的合理区间。高斯过程模型用来取代耗时的动力时程分析,降低隔震支座优化设计的计算成本。分析结果表明:铅芯橡胶支座的特征强度和初始刚度对桥梁系统地震易损性有明显影响;支座优化设计有效降低了桥梁系统地震易损性,大幅减小支座的剪切应变,提高了支座的隔震效率。The isolation bearing is of great significance to the seismic resistance of bridges,and the optimization of bearing parameters can effectively improve the seismic isolation efficiency.A three-span continuous girder bridge is used as an example,and a finite element model considering soil-pile-structure interaction(SPSI)is established.The characteristic strength and elastic stiffness of lead rubber bearing are adopted as optimization variables to minimize the seismic fragility of bridge structures.By dynamic time history analysis,the reasonable ranges of bearing parameters are determined.The Gaussian process model is used to replace the time-consuming dynamic time history analysis,aiming to reduce the computational burden of the optimal design of the isolation bearing.The analysis results of this study show:(1)the characteristic strength and elastic stiffness of lead rubber bearing have obvious influence on seismic fragility of bridge system;and(2)the bearing optimization effectively reduces the seismic fragility of the bridge system,significantly reduces the shear strain of the bearing,and improves the isolation efficiency of the bearing.

关 键 词：地震易损性 桥梁结构 铅芯橡胶支座 高斯过程模型 优化设计 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]