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1、第28卷第6期地震工程与工程振动Vo.l28No.62008年12月JOURNALOFEARTHQUAKEENGINEERINGANDENGINEERINGVIBRATIONDec.2008文章编号:1000-1301(2008)06-0106-10近断层地震动对短肢剪力墙高层结构地震反应的影响杨迪雄,王汉兵,李刚(大连理工大学工程力学系工业装备结构分析国家重点实验室,辽宁大连116023)摘要:近断层地震动具有独特的上盘效应、破裂方向性效应和速度脉冲特征。本文分组考察具有这些运动特征的地震动对短肢剪力墙
2、高层建筑结构地震反应的影响。选择台湾集集近断层地震动记录作为地震动输入,利用ANSYS软件对一幢12层短肢剪力墙结构建立空间杆件-壳元组合有限元模型,进行弹塑性时程分析。计算结果表明,近断层地震动上盘效应和破裂方向性效应明显增大短肢剪力墙结构体系的地震反应,短肢剪力墙高层结构的最大层间位移角发生在中部第5层,为0.98%,说明该结构已经达到中等破坏状态;脉冲型地震动效应与结构周期长短密切相关,对长周期结构脉冲效应显著。关键词:近断层地震动;运动特征;短肢剪力墙结构;弹塑性时程分析中图分类号:P315.9文
3、献标志码:AInfluenceofnear-faultgroundmotionsonseismicresponsesofhighrisestructurewithshort-limbwallsYANGDixiong,WANGHanbing,LIGang(DepartmentofEngineeringMechanics,andStateKeylaboratoryforStructuralAnalysisofIndustrialEquipment,DalianUniversityofTechnology,Da
4、lian116024,China)Abstract:Near-faultgroundmotionshavethedistinctcharacteristicsofhangingwalleffec,trupturedirectivityeffec,tandvelocitypulse-likemotion.Thepresentpaperexaminestheinfluenceofthegroundmotionswiththesecharacteristicsontheseismicresponsesofthe
5、highrisebuildingstructurewithshor-tlimbwalls.Near-faultgroundmotionrecordingsfromthesameearthquakeeven,t.ie.Ch-iCh,iTaiwanearthquake(Sep.21,1999),arese-lectedasaninpu.tTheANSYSsoftwareisusedtoestablisha3Dmember-shellcombinedfiniteelementmodelforone12-stor
6、yhighrisebuildingstructurewithshor-tlimbwalls,andtheelasto-plastictimehistoryanalysisofthestructureisimplemented.Thenumericalresultsillustratethatthehangingwallandthedirectivityeffectamplifytheseismicresponsesofthestructuralsystemwithshor-tlimbwallsremark
7、ably,andthemaximumdriftratioofthestruc-thtureoccursatthe5storyinthemiddleofthebuilding,andattains0.98%,whichdemonstratesthatthebuildingreachesmediumdamagestate.Moreover,theeffectofpulse-likegroundmotionsdependshighlyonthestructuralperiod,andthepulse-likee
8、ffectonthelong-periodstructureissignifican.tKeywords:near-faultgroundmotion;motioncharacteristics;shor-tlimbwallstructure;elasto-plastictimehistoryanalysis收稿日期:2006-12-14;修订日期:2007-09-25基金项目:国家自然科学基金项目(50578028,1067
