摘要
为了研究余震作用下主震受损砖石古塔的损伤规律,以中江南塔为原型,建立相似比为1∶35的试验模型进行振动台试验,研究结构在主余震序列作用下的动力特性、损伤模式及动力响应特征,并采用余震影响比来分析余震对主震受损古塔的影响。结果表明:在输入地震动频谱、结构自振特性、古塔构造特征的影响下,试验模型第一、四、六、七层明显破坏;对于主震损伤结构,低幅值余震不会引起受损古塔的“二次损伤”,当余震幅值达到0.05g~0.15g时,古塔结构发生“二次损伤”;结构顶部峰值加速度和最大层间位移角的余震影响比分别介于22.93%~65.72%和58.59%~87.12%,余震对于古塔最大层间位移角的影响较为明显。因此,应重视余震时对主震损伤古塔的保护。
In order to study the influence law of aftershock on the damaged masonry pagoda during main shock,taking the Zhongjiang South Pagoda as a prototype,a test model with a similarity ratio of 1:35 is established for shaking table tests.The dynamic properties,damage modes,and dynamic response of the structure under the action of the main-aftershock sequence are studied,and the influence ratio of aftershock is used to analyse the effect of the aftershock on the mainshock-damaged ancient pagoda.The results show that the first,fourth,sixth and seventh floors of the test model are obviously damaged under the influence of the input ground motion spectrum,natural vibration characteristics,and structural constitution of the ancient pagoda;for the mainshock-damaged structure,the low-amplitude aftershocks do not cause‘secondary damage'to the damaged pagoda,and the‘secondary damage'occurs to the structure when the amplitude of the aftershock reaches between 0.05g and O.15g.The influence ratio of aftershock for the peak acceleration at the top of the structure and maximum interstorey drift ranged from 22.93%~65.72%and 58.59%~87.12%respectively,and the aftershock's impact on the maximum inter-storey drift of the pagoda is more obvious.Therefore,attention should be paid to the protection of the main shock damaged pagodas during the aftershock.
作者
姜治军
徐呈昊
张磊
李胜才
袁建力
周星宇
Jiang Zhijun;Xu Chenghao;Zhang Lei;Li Shengcai;Yuan Jianli;Zhou Xingyu(Yangzhou University,College of Architectural Science and Engineering,Yangzhou 225100,China;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Bejing 100124,China)
出处
《建筑科学》
北大核心
2025年第5期17-25,共9页
Building Science
基金
国家自然科学基金项目(51478409)
江苏省产学研合作项目(BY20221086)
北京工业大学城市与工程安全减灾教育部重点实验室开放课题(2023B05)
教育部供需对接就业育人项目(2023122959765)。
关键词
砖石古塔
主余震序列
二次损伤
余震影响比系数
masonry pagoda
main-aftershock sequence
secondary damage
influence ratio of aftershocks
