基于简化模型的高层隔震结构选波方法研究  

Study on ground motion selection for time-history analysis of high-rise isolated structure based on simplified model

作　　者：李金风 王德才[2] 华贝 种迅[1] LI Jinfeng;WANG Decai;HUA Bei;CHONG Xun(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;School of Architecture and Art,Hefei University of Technology,Hefei 230601,China;Zhejiang Branch,China Architecture Design and Research Group,Hangzhou 310012,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学建筑与艺术学院,安徽合肥230601 [3]中国建筑设计研究院有限公司浙江分公司,浙江杭州310012

出　　处：《合肥工业大学学报（自然科学版）》2021年第4期508-513,542,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51708165);安徽省自然科学基金资助项目(1708085QE103)。

摘　　要：地震动输入是影响高层隔震结构时程分析结果可靠性的重要因素。文章建立能反映高层隔震结构变形和动力特性的简化模型,并以此作为分析对象,基于双频段选波方法对不同自振周期的模型进行时程分析,研究高层隔震结构时程分析选取地震动记录时结构动力特性的影响;以结构隔震层、顶层的位移和加速度反应作为评价指标,对比分析了不同天然地震动记录选取方法的有效性和适用性。结果表明:采用反应谱双频段选波方法应合理选取控制频段;基于地震信息的选波方法与结构动力特性无关,且没有把降低结构反应的离散性作为选波目标,但合理选取并控制地震动参数也能有效降低反应的离散性;最不利选波方法能有效筛选出对结构破坏性较大的记录,但离散性较大,该方法适用于校核结构的抗震性能。Ground motion selection is an important factor that influences the reliability of time-history analyses of the high-rise isolated structure.The simplified models that can reflect the deformation and dynamic characteristics of the high-rise isolated structure are established.A series of time-history analyses for the high-rise isolated structure are conducted with different natural periods based on double-band method to research the influence of the structural dynamic characteristics.The displacement response and acceleration response for the isolation layer and top floor are selected as evaluation indexes to compare the effectiveness and applicability for different methods of ground motion selection.The results show that the reasonable frequency range should be selected while using the method of double-band spectrum match.The selection method based on seismic information is irrelevant with the structural dynamic characteristics,and the structural response discreteness under different ground motions is not considered.However,the discreteness can be effectively reduced by reasonably selecting and controlling ground motion parameters.Using the method of severest ground motion can effectively select the ground motions that cause the larger damage for structure,but the structural response discreteness under different ground motions is bigger.Thus,this method is suitable for verifying the structural seismic performance.

关 键 词：高层隔震结构 地震动输入选取 简化模型 

分 类 号：P315.9[天文地球—地震学]