2022年泸定地震某隔震建筑内非结构构件震害模拟分析  

Evaluation of Seismic Damage to Non-structural Components in an Isolated Building During the 2022 Luding Earthquake

作　　者：陈尉唯 王健泽 戴靠山 李弢 杨毅坚 CHEN Weiwei;WANG Jianze;DAI Kaoshan;LI Tao;YANG Yijian(College of Architecture and Environment,Sichuan Univ.,Chengdu 610065,China;Key Lab.of Deep Underground Sci.and Eng.for Ministry of Education,Sichuan Univ.,Chengdu 610065,China)

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学深地科学与工程教育部重点实验室,四川成都610065

出　　处：《工程科学与技术》2024年第2期172-185,共14页Advanced Engineering Sciences

基　　金：四川省自然科学基金项目(2022NSFSC0988,2022NSFSC0432)。

摘　　要：2022年9月5日四川泸定地震中,位于震中近断层场地的一栋采用隔震设计的建筑内部非结构构件发生不同程度的破坏。非结构构件作为整体结构经济价值最重要的组成部分,减小其地震损伤对于建筑震后功能恢复至关重要。为此,在介绍该建筑内部非结构构件主要震害的基础上,采用二阶段级联方法对非结构件在地震中的具体运动响应进行模拟。第1阶段,在Etabs中建立一8层框架–剪力墙结构有限元模型,基于实测邻近台站近断层强震记录的非线性地震反应分析,模拟该建筑各楼层地震响应;第2阶段,以建筑内部文件柜等常见浮放式非结构构件为原型,在OpenSees中建立零长度转角弹簧模型,以上一阶段的结构楼面加速度响应作为输入,模拟建筑内部不同尺寸高宽比非结构构件的摇晃与倾覆响应,并同时考虑水平单向输入与水平–竖向双向输入两种方式,重点考察近断层地震强竖向分量的影响。结果表明:隔震层能有效降低上部结构的水平楼面加速度响应,但竖向楼面峰值加速度相比竖向地面峰值加速度被显著放大;水平与竖向激励同时输入下浮放式设备的摇晃角度与倾覆概率大于水平单向激励输入的情况,考虑竖向激励的作用后会增大浮放式设备的倾覆破坏风险。因此,在近断层场地进行建筑抗震设计时,强竖向地面运动对建筑内部非结构构件的影响不容忽视。On September 5,2022,a seismic event with a magnitude of 6.8 occurred in Luding,Sichuan,resulting in varying degrees of damage to non-structural components inside a seismic isolation-designed building located near the epicenter fault.Non-structural components constitute a substantial portion of the overall structural economic value,and their seismic damage is crucial for post-earthquake functional recovery.Con-sequently,this study presents the primary seismic damage to non-structural components within the building,employing a two-stage cascading analysis approach.In the first stage,nonlinear response history analyses of an 8-story frame-shear wall building's Etabs model were conducted,utilizing a set of ground motion records from nearby monitoring stations to simulate floor seismic response.In the second stage,employing com-mon freestanding non-structural components,such as document cabinets inside the building as prototypes,nonlinear response history analyses of a zero-length rotation spring OpenSees model were performed.This analysis considered a suite of floor acceleration responses obtained from the previous stage to simulate rocking and overturning responses of non-structural components with varying sizes and slenderness throughout the building.Rocking and overturning responses of non-structural components subjected to both bidirectional and unidirectional inputs were ex-amined,with a specific emphasis on the impact of the strong vertical component of the near-fault ground motion.The results indicate that the isol-ation system effectively reduces the horizontal floor acceleration response of the upper structure.However,the vertical peak floor acceleration is significantly amplified compared to the vertical peak ground acceleration.Furthermore,under bidirectional horizontal and vertical excitations,the rocking angles and the probability of overturning for freestanding non-structural components exceed those observed under horizontal unidirection-al excitation.The influence of vertical excitation significantly i

关 键 词：泸定地震 隔震建筑 近断层地震 多维地震作用 非结构构件 摇晃响应 倾覆响应 

分 类 号：TU352.12[建筑科学—结构工程]