摘要
近断层脉冲型地震作用对工程结构破坏作用较强,连体结构传力机制复杂,研究其在脉冲型地震下的抗震性能至关重要。利用SAP 2000有限元软件建立了连体结构数值模型,研究了其在近断层脉冲型与非脉冲型地震动作用下的结构响应特征,基于增量动力分析法研究了其在两种类型地震动作用下的结构易损性,进而评价了其在脉冲型地震作用下的安全性。结果表明:与非脉冲型地震作用相比,脉冲型地震动作用下连体结构的楼层峰值加速度、最大层间位移角、基底剪力明显较大,平均差异分别可达77%、131%及94%;脉冲型地震作用下连体结构对应各级极限状态的超越概率明显较大,尤其极限状态LS5对应的超越概率差异最为显著。此外,脉冲型地震动作用下的连体结构基本满足“小震不坏、中震可修、大震不倒”的抗震设防目标。但是地震动脉冲特征对连体结构的不利影响仍然值得关注。
Near-fault pulse-like ground motion has a strong destructive effect on engineering structures,and the force transmission mechanism of connected structures is complex.It is crucial to study their seismic performance under this kind of ground motion.This study uses sap 2000 finite element software to establish a numerical model of a connected structure,and its dynamic response characteristics under pulse-like and non-pulse ground motions is studied.Based on the incremental dynamic analysis method,the structural vulnerability under two types of ground motion is studied,then its safety under pulselike ground motion is evaluated.The results show that compared with non-pulse ground motion,the peak acceleration,maximum inter-story drift,and base shear force of connected structures under pulse-like ground motion are significantly larger,with an average difference of 77%,131%,and 94%,respectively.Under the action of pulse-like earthquakes.The exceedance probability of the connected structure corresponding to the limit state of each level is obviously larger,especially the difference in exceedance probability corresponding to LS5 is the most significant.In addition,the connected structures under the action of pulse-like ground motion basically meet the seismic fortification goals of"not damaged by small earthquakes,repairable by medium earthquakes,and not collapsed by large earthquakes".However,the adverse effects of ground motion pulse characteristics on connected structures are still worthy of attention.
作者
姜治军
钟荣强
张磊
魏春明
张贺
JIANG Zhi-jun;ZHONG Rong-qiang;ZHANG Lei;WEI Chun-ming;ZHANG He(College of Civil Science and Engineering,Yangzhou University,225000,Yangzhou,Jiangsu,China;Jiangsu Huajian Construction Co.,Ltd.,225000,Yangzhou,Jiangsu,China)
出处
《建筑技术》
2024年第17期2133-2137,共5页
Architecture Technology
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
近断层脉冲型地震动
连体结构
地震易损性
动力响应
near-fault pulse-like ground motion
connected structures
seismic vulnerability
dynamic response
