基于位移-速度输入法结构多点激励FPS支座隔震效果研究  

Research on Seismic Isolation Efficiency of FPS Bearing under Multi-point Excitation of Earthquake Waves Based on Displacement-velocity Input Method

作　　者：王浩霆 葛楠 韩流涛 于建东 WANG Haoting;GE Nan;HAN Liutao;YU Jiandong(North China University of Science and Technology,Architectural Engineering Institute,Tangshan 063210,China)

机构地区：[1]华北理工大学建筑工程学院,河北唐山063210

出　　处：《防灾减灾工程学报》2024年第1期165-174,共10页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：受行波效应、相干效应、场地效应的影响,大跨度结构的多点激励地震反应分析非常复杂,且考虑多点激励下对大跨空间网格结构隔震性能的影响是结构工程抗震方向中有重大意义的研究课题。以单层圆柱面大跨度空间网架结构为研究对象,基于直接位移法,应用SAP2000有限元软件建立了多点激励动力反应时程分析模型,进行结构在地震动一致激励和多点激励作用下的动力反应分析计算。结果表明:水平地震动多点激励效应对大跨度空间结构的影响十分显著,需采取使用多点激励输入方式。不设置隔震支座时,多点激励下,支撑柱弯矩与剪力随波速的减小而明显增加,柱顶位移变小,中柱轴力略微上升。基础隔震时,各支撑柱柱顶内力与位移的分配较无隔震时存在差异。边柱的弯矩、剪力及轴力均小于中柱的相应值,但柱顶位移增加明显。柱弯矩减震效率保持在45%~75%,柱剪力减震效率保持在60%~85%;柱顶隔震时,能得到比基础隔震更高的隔震效率,且柱弯矩隔震效率高达90%左右,柱剪力隔震效率保持在85%~90%。柱顶位移显著减小,柱轴力比基础隔震时略有增加。Under the influence of the traveling wave effect,coherence effect and site effect,the seis-mic response analysis of long-span structures under multi-point excitation is very complex,and consid-ering the influence of multi-point excitation on the isolation performance of long-span spatial grid struc-tures is a significant research topic in seismic engineering.An analytical seismic dynamic model under multi-point excitation was presented using SAP2000 finite element software and displacement input method for a single-layer cylindrical lattice shell large-span structure.The seismic dynamic response for consistent excitation and multi-point excitation were executed respectively.Results show that the multi-point excitation effect could exert a notable influence on the seismic dynamic response of spatial large-span structures,and the use of multi-point excitation is necessary.When the seismic isolation is absent,the column moment and shear force increase significantly,displacement of column top de-creases and the axial force in the middle column increases slightly with the decrease of seismic wave velocity.When the base isolations are considered,the mitigation efficiency is in the range of 45%to 75%for column moments and is maintained between 60%and 85%for column shear forces.The dis-tribution of column inner forces and displacement is different from that without seismic isolation.The inner forces of side columns are all smaller than those of central columns while the relative displace-ment at the top of the columns increases obviously.When column top isolations are installed,higher seismic isolation efficiency can be expected,with a column moment damping efficiency of about 90%and a column shear force damping efficiency between 85%and 90%.The displacement at the top of the column notably decreases and the column axial forces slightly decline.

关 键 词：空间网架结构 多点激励 时程分析 FPS摩擦摆支座 大质量法 

分 类 号：TU393.3[建筑科学—结构工程]