大尺度空间结构多点输入地震反应分析应用研究
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摘要
GB 50011—2010《建筑抗震设计规范》要求对于平面投影尺度很大的空间结构,应进行多点输入地震反应分析。在多点输入地震反应分析的主要方法中,时程分析法的应用最为广泛。在确定多点输入地震波时,主要考虑行波效应和局部场地条件效应。多点输入时程分析在有限元分析程序中的实现方法主要有两种,一是对各支座点施加强制边界条件,二是采用大质量法。据此,提出以超载单元和超载比作为多点输入对结构影响的主要评价指标,并根据多个实际工程多点输入分析的经验,给出了多点输入的一般性结论:多点输入将增加结构的扭转输入,因此对于边角构件的影响较大;多点输入降低输入的同步性,因此结构平动反应减小;在一定视波速范围内,多点输入影响随着视波速的减小逐渐增加;多点输入的影响随着楼层的增高而减小等。
Based on the 'Code for seismic design of buildings(2010)',seismic analysis under multi-support excitation should be done to structures with large dimension.The time-history seismic analysis method is popular among the main methods used for multi-support seismic analysis.In confirming the multi-support earthquake wave,the traveling wave effect and local site effect are two critical factors.Generally,there are two methods to make multi-support excitation analysis in finite element program.One is the compulsory boundary condition method,and the other is the big-mass method.The paper suggests taking the overload element and overload proportion as the evaluation index to the influence of multi-support seismic analysis.At the same time,some common conclusions are summarized in the paper based on the analysis experience of some projects.Such conclusions include that the torsion effect will be increased under multi-support seismic analysis and then result in adverse effect on the corner and side members.The earthquake input synchronization will be reduced under multi-support seismic analysis and then decrease the structure translational displacement.Generally,the influence of multi-support seismic analysis will be increased along with the reduction of traveling wave velocity while be decreased along with the increase of the building height.
Based on the 'Code for seismic design of buildings(2010)',seismic analysis under multi-support excitation should be done to structures with large dimension.The time-history seismic analysis method is popular among the main methods used for multi-support seismic analysis.In confirming the multi-support earthquake wave,the traveling wave effect and local site effect are two critical factors.Generally,there are two methods to make multi-support excitation analysis in finite element program.One is the compulsory boundary condition method,and the other is the big-mass method.The paper suggests taking the overload element and overload proportion as the evaluation index to the influence of multi-support seismic analysis.At the same time,some common conclusions are summarized in the paper based on the analysis experience of some projects.Such conclusions include that the torsion effect will be increased under multi-support seismic analysis and then result in adverse effect on the corner and side members.The earthquake input synchronization will be reduced under multi-support seismic analysis and then decrease the structure translational displacement.Generally,the influence of multi-support seismic analysis will be increased along with the reduction of traveling wave velocity while be decreased along with the increase of the building height.
引文
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[12]傅学怡,杨想兵,高颖.多重弦支网格梁结构在山西体育中心三馆钢屋盖中的应用[J].建筑结构学报,2012,33(5):1-8.(FU Xueyi,YANG Xiangbing,GAO Ying.Application of multiple suspended beamstructure in the Shanxi Olympic Gymnasium[J].Journal of Building Structures,2012,33(5):1-8.(inChinese))
[2]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB50011—2010Codefor seismic design of buildings[S].Beijing:ChinaArchitecture&Building Press,2010.(in Chinese))
[3]Zerva A.Response of multi-span beams to spatiallyincoherent seismic ground motions[J].EarthquakeEngineering&Structural Dynamic,1990,19(6):819-832.
[4]Der Kiureghian Armen,Neuenhofer Ansgar.Responsespectrum method for multi-support seismic excitations[J].Earthquake Engineering&Structural Dynamic,1992,21(8):713-740.
[5]李建俊,林家浩,张文首,张宏宝.大跨度结构受多点随机地震激励的响应[J].计算结构力学及其应用,1995,12(4):445-452.(LI Jianjun,LIN Jiahao,ZHANG Wenshou,ZHANG Hongbao.Response oflong-span structures subjected to arbitrarily coherentmulti-point stationary random seismic excitation[J].Computational Structural Mechanics and Applications,1995,12(4):445-452.(in Chinse))
[6]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360.(Lin Jiahao,Zhang Yahui,Zhao Yan.Method andrecent advances in seismic analysis of long-spanstructures[J].Advances in Mechanics,2001,31(3):350-360.(in Chinese))
[7]胡世德,范立础.江阴长江公路大桥纵向地震反应分析[J].同济大学学报,1994,22(4):433-438.(Hu Shide,Fan Lichu.Longitudinal seismic analysisof Jiangyin Changjiang river bridge[J].Journal ofTongji University,1994,22(4):433-438.(inChinese))
[8]刘枫,肖从真,徐自国,等.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5):56-63.(LIU Feng,XIAO Congzhen,XU Ziguo,et al.Time-history analysis of terminal 3 ofthe Capital Airport under multi-support and multi-dimension seismic excitation[J].Journal of BuildingStructures,2006,27(5):56-63.(in Chinese))
[9]傅学怡,廖新军,周颖,等.杭州奥体博览城主体育场罩棚结构设计[C]//中国钢协结构稳定与疲劳分会第12届(ASSF-2010)学术交流会暨教学研讨会论文集.北京:《钢结构》编辑部,2010:793-800.
[10]刘枫,张高明,杜义欣,赵鹏飞.武汉国际博览中心二期海洋乐园屋盖钢结构体系研究[C]//第十四届空间结构学术会议.北京:中国土木工程学会桥梁及结构工程分会空间结构委员会,2012:774-780.
[11]傅学怡,杨想兵,高颖,等.山西体育中心三馆结构设计综述[J].施工技术,2012,41(14):66-72,176.(FU Xueyi,YANG Xiangbing,Gao Ying,et al.Structure design of the three pavilions of Shanxi SportsCenter[J].Construction Technology,2012,41(14):66-72,176.(in Chinese))
[12]傅学怡,杨想兵,高颖.多重弦支网格梁结构在山西体育中心三馆钢屋盖中的应用[J].建筑结构学报,2012,33(5):1-8.(FU Xueyi,YANG Xiangbing,GAO Ying.Application of multiple suspended beamstructure in the Shanxi Olympic Gymnasium[J].Journal of Building Structures,2012,33(5):1-8.(inChinese))
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