近场地震动对我国RC框架结构地震响应影响分析  

Analysis of the influence of near-field ground motion on the seismic response of RC frame structure in China

作　　者：张令心[1,2] 王子铭 朱柏洁 ZHANG Lingxin;WANG Ziming;ZHU Baijie(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080

出　　处：《世界地震工程》2024年第4期39-50,共12页World Earthquake Engineering

基　　金：国家自然科学基金项目(U2139209);黑龙江省自然科学基金(LH2021E120);中国地震局工程力学研究所基本科业务费专项资助项目(2021C04)。

摘　　要：近场地震常含有丰富的脉冲成分,其短时间内产生的冲击效应会对近场地区建筑结构造成严重破坏。钢筋混凝土(reinforced concrete,RC)框架结构在我国城镇地区应用较多,为此应开展近场地震动对我国框架结构地震响应影响研究。基于近期记录较为完整的土耳其M 7.8级地震,筛选出近场脉冲型和非脉冲型两类地震动各2条作为输入,并对比分析了4条地震动加速度反应谱的形状特征;按8度设防设计并建立了4、7、10层三个不同周期的RC框架结构有限元分析模型,利用现有试验结果验证了该模型的准确性;采用非线性动力时程分析方法,通过比较地震加速度反应谱、结构层间位移角、结构耗能和梁、柱构件利用率等指标,从结构整体到构件层面综合分析了这两类地震动对框架结构地震响应的影响。研究结果表明:所选的脉冲型地震动加速度反应谱平台段较长且双峰和多峰特性明显,非脉冲型地震动加速度反应谱的单峰特性明显;在这两类地震动作用下,短周期结构整体响应以及梁、柱构件的破坏程度均与地震加速度反应谱值呈正相关性;而对于中和长周期结构,相比较非脉冲型地震动,脉冲型地震动作用下会造成加速度反应谱值小,而结构整体响应以及梁、柱构件的破坏程度较大的现象。因此,对该类结构进行抗震设计时应充分考虑近场地震动脉冲效应的影响。Near-field earthquakes often contain rich pulse components,and the impact effects generated in a short period of time will cause serious damage to building structures in the near-field area.Due to reinforced concrete(RC)frame structure widely used in urban areas in China,the influence of near-site earthquake on seismic response of frame structures in China should be studied.Based on the recent M 7.8 earthquake in Turkey with relatively complete records,two near-field pulse-type and two non-pulse-type ground motions are selected as input.The shape features of acceleration response spectrum of4 ground motions are compared.The finite element models of RC frame structure with three different periods for respective 4,7 and 10 stories were designed and established,and the accuracy of the model was verified by the existing test results.The nonlinear dynamic time history analysis method is used to comprehensively analyze the influence of these two types of ground motions on the seismic response of frame structures by comparing the seismic acceleration response spectrum,the inter-story displacement angle of the structure,the energy consumption of the structure,and the utilization rate of the beam and column members.The effects of these two types of ground motions on the seismic response of frame structures are analyzed from the whole structure to the component level.The results show that the selected acceleration response spectrum of pulse-type ground motion has a long platform and obvious bimodal characteristics,while the acceleration response spectrum of non-pulse-type ground motion has obvious unimodal characteristics.Under the action of these two types of ground motion,the response of whole structure and beam/column of short-period structure are positively correlated with the value of seismic acceleration response spectrum.For medium and long-period structures,the acceleration response spectrum will be small and the structural response with the damage of beam/column will be large under the action of pulse-type ground

关 键 词：近场地震动 RC框架结构 地震响应影响分析 结构非线性分析 土耳其M 7.8地震 

分 类 号：TU352.11[建筑科学—结构工程]