近场地震作用下不规则层间隔震结构的动力响应分析
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摘要
层间隔震结构作为一种新型的隔震形式,不仅可以降低上部结构的动力响应,还可以弥补基础隔震结构的不足。现有研究多集中在远场地震作用下的规则层间隔震结构。本文利用通用结构分析与设计软件SAP2000分别模拟了一幢8层带裙房钢筋混凝土框架层间隔震结构、基础隔震结构和抗震结构,分析并对比了三种结构在近场地震作用下动力响应特征。结果表明在近场条件下三种结构顶层均出现不同程度的鞭梢效应;相比抗震结构两种隔震结构具有很好的减震效果,而且基础隔震结构的减震效果好于层间隔震结构;由于结构刚度突变的部位剪力较大,所以应对其裙楼顶部予以加强。
As a new form of isolation,the story isolation structure not only can reduce the dynamic response of upper structures but also can make up for the deficiency of foundation isolation structures.The existing literature mostly analyzes the regulated story isolation structures in far-field earthquakes.In this paper,an eight-story house with a podium-reinforced concrete frame story isolation structure,a foundation isolation structure,and a seismic structure are simulated by using SAP2000.The dynamic responses of the three structures in near-field earthquake conditions are compared.The results show that the whiplash effect is different in the top stories of the three structures in the near-field conditions.However,compared with the seismic structure,the other two kinds of isolated structures show very good damping behavior.In addition,the damping properties of the foundation isolation structure are better than the story isolation structure.Therefore,structures with a podium should be strengthened at the top of the podium.
As a new form of isolation,the story isolation structure not only can reduce the dynamic response of upper structures but also can make up for the deficiency of foundation isolation structures.The existing literature mostly analyzes the regulated story isolation structures in far-field earthquakes.In this paper,an eight-story house with a podium-reinforced concrete frame story isolation structure,a foundation isolation structure,and a seismic structure are simulated by using SAP2000.The dynamic responses of the three structures in near-field earthquake conditions are compared.The results show that the whiplash effect is different in the top stories of the three structures in the near-field conditions.However,compared with the seismic structure,the other two kinds of isolated structures show very good damping behavior.In addition,the damping properties of the foundation isolation structure are better than the story isolation structure.Therefore,structures with a podium should be strengthened at the top of the podium.
引文
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[2]徐忠根,周福霖.底部二层框架上部多塔楼底隔震数值模拟与试验研究[J].地震工程与工程振动,2005,25(1):126-132.XU Zhong-gen,ZHOU Fu-lin.Data Imitation and Test Re-search of Tower Bottom Isolation of Buildings with Lower TwoStories Frame and Upper multi-tower[J].Earthquake Engi-neering and Engineering Vibration,2005,25(1):126-132.
[3]陶明白,盛宏玉,吴韬,等.竖向刚度突变结构设置层间隔震层在地震作用下的反应谱分析[J].安徽建筑工业学院学报,2008,16(5):18-21.TAO Ming-bai,SHENG Hong-yu,WU Tao,et al.ResponseSpectrum Analysis for the Structure with Changing VerticalStiffness and Story Isolation under Earthquake Excitation[J].Journal of Anhui Institute of Architecture&Industry.,2008,16(5):18-21.
[4]卢明奇,田玉基,杨庆山.近断层地震作用下高层建筑结构地震响应分析[J].世界地震工程,1996,(2):33-36.LU Ming-qi,TIAN Yu-ji,YANG Qing-shan.Analysis ofSeismic Response of High-rise Building to Near-fault GroundMotions[J].World Earthquake Engineering.,2007,(29)2:314-317.
[5]叶昆,李黎,朱宏平,等.近断层脉冲型地震作用下基础隔震建筑结构最大位移反应研究[A]∥第四届全国防震减灾工程学术研讨会论文集[C].北京:中国建筑工业出版社,2009:523-530.YE Kun,LI Li,ZHU Hong-ping,et al.Study on MaximumDisplacement of Base-isolated Buildings under Near-faultPulse-like Ground Motions[A]∥Fourth National EarthquakeResistant Engineering Proceedings[C].Beijing:China Archi-tecture&Building Press,2009:523-530.
[6]王根龙,刘红帅,张军慧.汶川特大地震之北川县城震害分析[J].西北地震学报,2010,32(2):173-178.WANG Gen-long,LIU Hong-shuai,ZHANG Jun-hui.Analy-sis on Seismic Hazards in Beichuan County Town Caused byWenchuan Great Earthquake[J].Northwestern SeismologicalJournal,2010,32(2):173-178.
[7]罗光财,丁海平,王绍博.PGV/PGA和PGD/PGA随震级和震中距变化的研究[J].西北地震学报,2010,32(2):112-116.LUO Guang-cai,D ING Hai-ping,WANG Shao-bo.Variationof the PGV/PGAand PGD/PGAalong with the Change ofMagnitudes and Epicentral Distances[J].Northwestern Seis-mological Journal,2010,32(2):112-116.
[8]徐忠根,周福霖.多层钢结构基础隔震性能研究[J].地震工程与工程震动,1999,19(3):131-135.XU Zhong-gen,ZHOU Fu-in.Base Isolation Research ofMulti-story Steel Frame[J].Earthquake Engineering and En-gineering Vibration,1999,19(3):131-135.
[9]夏坤,张令心,刘洁平.建筑物高低层地震反应差异研究[J].西北地震学报,2011,33(3):284-290.XIA Kun,ZHANG Lin-xin,LIU Jie-ping.Study on Differ-ence between Seismic Response of Lower Stories and That ofHigher Stories of Building[J].Northwestern SeismologicalJournal,2011,33(3):284-290.
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