近场波动对钢筋混凝土框架结构地震响应的影响  

Impacts of near-field wave motion on seismic response of a reinforced concrete frame structure

作　　者：彭丽 高智能 凌远辉 左志成 谷音[3,4] PENG Li;GAO Zhineng;LING Yuanhui;ZUO Zhicheng;GU Yin(School of Civil Engineering&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Key Laboratory for Geo-Environmental Engineering and Engineering Disaster Governance of Jiangxi Province,Ganzhou 341000,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Key Laboratory for Multi-disaster Prevention and Governance of Civil Engineering of Fujian Province,Fuzhou 350108,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000 [2]江西省环境岩土与工程灾害控制重点实验室,江西赣州341000 [3]福州大学土木工程学院,福建福州350108 [4]福建省土木工程多灾害防治重点实验室,福建福州350108

出　　处：《福建理工大学学报》2024年第3期225-232,共8页JOURNAL OF FUJILAN UNIVERSITY OF TECHNOLOGY

基　　金：国家自然科学基金项目(52068032)。

摘　　要：采用一维化时域方法将地震波动转化为等效节点荷载,通过三维黏弹性人工边界单元模拟远场地基辐射阻尼,建立基于刚性地基假定和考虑近场波动的三维钢筋混凝土框架结构有限元模型,对比内力和位移动力时程响应。研究表明:考虑近场波动使钢筋混凝土框架结构自振周期变长;与刚性地基假定相比,在观测点处,梁端弯矩幅值增大,轴力幅值减小,剪力幅值改变;柱端弯矩幅值减小,轴力幅值增大,剪力幅值也存在差异;顶点位移和层间位移均衰减。A one-dimensional time-domain method was used to convert seismic wave into equivalent nodal loads.The far-field foundation radiation damping was simulated by three-dimensional viscous-elastic artificial boundary elements.Two three-dimensional finite element models of reinforced concrete frame structures based on the assumption of rigid foundation and considering near-field fluctuations were established,and the internal force and displacement dynamic time-history response were compared.The research shows that considering near-field wave motion can prolong the natural vibration period of reinforced concrete frame structures;comparison with the assumption of a rigid foundation shows that at the observation point,the amplitude of the bending moment at the beam end increases,the amplitude of the axial force decreases,and the amplitude of the shear force changes;the amplitude of the bending moment at the column end decreases,the amplitude of the axial force increases,and there are also differences in the amplitude of the shear force;both the top point’s displacement and the inter-story displacement attenuate.

关 键 词：钢筋混凝土框架结构 近场波动 一维化时域方法 地震波动输入 地震响应规律 

分 类 号：TU375.4[建筑科学—结构工程] P315.9[天文地球—地震学]