结合脉动测试的金刚宝座塔地震反应分析及震害预测  

A Masonry Vajra Throne Pagoda Seismic Response Analysis and Earthquake Damage Prediction Combined with Pulsation Measurement

作　　者：李嘉怿 卢俊龙 李凯[1] 张荫[1] LI Jiayi;LU Junlong;LI Kai;ZHANG Yin(Xi＇an University of Architecture and Technology,Xi＇an 710055, China;Xi＇an University of Technology, Xi＇an 710048, China)

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西安理工大学,陕西西安710048

出　　处：《防灾减灾工程学报》2017年第5期732-739,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51308455);陕西省自然科学基金项目(2015JM5206);住房与城乡建设部科技计划项目(2014-K2-018);陕西省博士后基金项目(2014)资助

摘　　要：为了研究内蒙古呼和浩特市慈灯寺金刚宝座塔的抗震性能,测试了金刚宝座上五座小塔的动力特性,并建立数值模型计算结构的动力特性。通过动力特性比较,确定了结构整体等效弹性模量,输入调幅后的三向EL-Centro波计算古塔的地震反应,输出古塔各层应力响应、弹性位移响应、最大层间位移角以及塔底加速度时程。结果表明:中塔的水平剪应力在塔体中部最大,中塔竖向正应力、边塔水平剪应力和竖向正应力在塔体底部最大;层间位移值在塔体顶部最大,中塔和边塔的结构薄弱层分别为4层与顶层以及底层与顶层。慈灯寺塔在8度多遇地震下塔体基本完好,在8度罕遇地震下塔体上部将产生严重破坏。设置金刚宝座降低了各小塔的振动频率,加大了塔体底部的加速度幅值,不利于古塔的抗震性能。To study the seismic property of vajra throne pagoda of Cideng Temple in Hohhot,Inner Mongolia Autonomous Region,the dynamic property of five tower above vajra throne were tested and a numerical model was built to calculate the dynamic characteristics of structures.We determine the equivalent elastic modulus of structure by comparing the dynamic property,and output the tower stress response,the elastic displacement response,the maximum interstory drift ratio of each layer and the bottom acceleration time history by inputting El Centro ground motion to calculate the seismic response of pagoda.Results indicate that the maximum value of horizontal shear stress is located in the middle of middle tower and at the bottom of side tower;the maximum value of vertical axial stress was located at the bottom of both tower;the maximum value of inter-story displacement was located at the top of both tower.The weak structures layer of middle tower are four-layer and top and side tower are at bottom and top.Pagoda of Cideng Temple can be basically integrity under frequent earthquake of intensity 8 but will suffer heavy damage in the top of structure under rare earthquake of intensity 8.The follows were indicated by calculation results that vajra throne reduces the calculated frequency of tower,increases the acceleration amplitude at the bottom of tower,which are bad for the seismic property of the pagoda.

关 键 词：金刚宝座塔 砖石古塔 数值模拟 地震反应 震害预测 

分 类 号：TU352.1[建筑科学—结构工程]