大跨度弦支穹顶结构多维多点随机地震响应分析  

Random seismic response analysis of long-span suspen-dome structure under multi support and multi dimensional earthquake excitations

作　　者：吕迎新 王宇[1] LÜYingxin;WANG Yu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《世界地震工程》2023年第4期177-184,共8页World Earthquake Engineering

基　　金：辽宁省教育厅项目(LJKZ0560)。

摘　　要：采用虚拟激励法,以一大跨度弦支穹顶结构—济南奥体中心体育馆为研究对象,考虑结构静力初始状态的影响,分析大跨度弦支穹顶结构多点激励随机地震响应。研究结果表明:大跨度弦支穹顶结构受行波效应与部分相干效应影响显著,考虑地震动空间变化效应使径向杆、环向杆、环索及竖向撑杆控制构件内力增幅约分别达到了50%、39%、27%及150%;其中结构不同类型、不同位置构件提升程度不同,需对具体响应具体分析;考虑地震动多维输入相比单维输入增大达到30%;行波效应与部分相干效应对结构轴力响应的影响程度存在差异;单独考虑行波效应和部分相干效应不能得到结构的最不利响应。由此得出结论:为确保大跨度弦支穹顶结构的安全,必须根据场地条件选取多种可能的地震波视波速,同时考虑部分相干效应的影响进行多维多点随机地震响应分析。A long-span suspen-dome structure-Jinan Olympic Center Gymnasium was selected as a research object,the pseudo excitation method considering the initial static state is adopted to analyze the structure random seismic response under multi support earthquake excitations0x0E䥺Symbol`@@0x0F,results show that wave passage effect and coherent effects has a great effect on the seismic response of the long-span suspen-dome structure,the axial forces of the controlled rods of radial members,circle members,hoop cables,brace struts may be increased by about 50%,39%,27%,150%when considering the multi support earthquake excitation;and the increase degree is different for different types and different positions of members,and need to be analyzed specifically;the axial forces of the control bars may be increased by about 30%when considering the multi dimensional effect of earthquake excitation;The influence degree of the wave passage effect and coherent effects on the axial forces response of the structure is different;With spatial variations considering wave passage effect or coherency effect only does not provide the most critical for the response calculations.The conclusions are that in order to guarantee the safety of the long-span suspen-dome structure,the random seismic analysis under multi support and multi dimensional earthquake excitation should be carried out for possible traveling wave velocities and considering the coherency effect is very necessary.

关 键 词：弦支穹顶结构 多点激励 随机地震分析 虚拟激励法 

分 类 号：TU394[建筑科学—结构工程]