既有钢筋混凝土框架原位推覆试验研究
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摘要
为研究既有结构地震损伤和破坏的特点,利用上世纪80年代初建造的一栋3层钢筋混凝土框架结构,进行了原位推覆试验。试验以原结构切割出的一单跨单开间框架为对象,其余部分作为反力装置。鉴于外砖墙的不对称性,水平加载力分布模式由按楼层倒三角分布的地震加速度乘以对应各加载点分配质量确定。根据结构的试验破坏过程,分析了结构的破坏机理,对其抗震性能作出评价。研究结果表明:墙体不对称布置引起结构严重扭转;梁、柱铰机制均未出现;结构的破坏是以底层柱剪切破坏为特征的脆性破坏。建议对既有老建筑结构抗震评估时,必须考虑梁、柱剪切破坏模式,并考虑楼板及墙体刚度的参与作用。
In order to study the seismic damage and failure patterns of aged existing building structures under earthquake,an in-situ pushover test was performed recently on a three-story reinforced concrete frame building built in early 80's of last centenary.A single span,single bay frame cut from the original structure was taken as the test object while the rest part was used as providing loading reaction.Considering unsymmetrical distribution of the brick walls,a loading pattern was scheduled using distributed mass at each loading point multiplied by seismic acceleration in inverted triangular distribution.The process of structural failure was reported,its intrinsic mechanism was analyzed,and the assessment on its seismic performance was given.It is shown that the torsional responses are obvious because of the unsymmetrical layout of brick wall,and realistic plastic hinge is not observed at the end of columns and beams.It is concluded that the final breakdown of the structure would be due to brittle type characterized by shear failure of the first story columns.It is suggested that shear failure models of beams and columns as well as rigidity of slab and brick wall must be taken into account for a reliable evaluation on seismic performance of aged existing building structures.
In order to study the seismic damage and failure patterns of aged existing building structures under earthquake,an in-situ pushover test was performed recently on a three-story reinforced concrete frame building built in early 80's of last centenary.A single span,single bay frame cut from the original structure was taken as the test object while the rest part was used as providing loading reaction.Considering unsymmetrical distribution of the brick walls,a loading pattern was scheduled using distributed mass at each loading point multiplied by seismic acceleration in inverted triangular distribution.The process of structural failure was reported,its intrinsic mechanism was analyzed,and the assessment on its seismic performance was given.It is shown that the torsional responses are obvious because of the unsymmetrical layout of brick wall,and realistic plastic hinge is not observed at the end of columns and beams.It is concluded that the final breakdown of the structure would be due to brittle type characterized by shear failure of the first story columns.It is suggested that shear failure models of beams and columns as well as rigidity of slab and brick wall must be taken into account for a reliable evaluation on seismic performance of aged existing building structures.
引文
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[11]GB 50011—2001建筑抗震设计规范[S].(GB50011—2001 Code for seismic design of buildings[S].(in Chinese))
[12]Priestley M J N,Seible F,Calvi G M.Seismic designand retrofit of bridges[M].New York:John Wiley&Sons,1996.
[13]Sezen H,Moehle J P.Shear strength model for lightlyreinforced concrete columns[J].Journal of StructuralEngineering,2004,130(11):1692-1703.
[2]Saatcioglu M.Seismic risk mitigation throughretrofitting nonductile concrete frame systems[C]//Advances in Earthquake Engineering for Urban RiskReduction.Turkey:Springer,2006:179-194.
[3]Hans S,Boutin C,Ibraim E,et al.In situ experimentsand seismic analysis of existing buildings.Part I:Experimental investigations[J].EarthquakeEngineering and Structural Dynamics,2005,34(12):1513-1529.
[4]Corte G D,Barecchia E,Mazzolani F M.Seismicupgrding of RC buildings by FRP:Full-scale tests of areal structure[J].Journal of Materials in CivilEngineering,2006,18(5):659-669.
[5]朱伯龙,蒋志贤,吴明舜.上海五层砌块试验楼抗震能力分析[J].同济大学学报:自然科学版,1981,9(4):7-14.(ZHU Bolong,JIANG Zhixian,WUMingshun.Seismic analysis of a five-story concreteblock masonry building[J].Journal of TongjiUniversity:Natural Science,1981,9(4):7-14.(inChinese))
[6]李桂青,张大森.石家庄79型框架轻板建筑整体破坏性试验研究[J].武汉理工大学学报,1986,8(2):191-198.(LI Guiqing,ZHANG Dasen.Destructivetest study of framed light-weight panel buildings Type79,Shijiazhuang[J].Journal of Wuhan University ofTechnology,1986,8(2):191-198.(in Chinese))
[7]李桂青.建筑结构整体试验方法[J].工程力学,1988,5(1):93-102.(LI Guiqing.In situ test methodof monolithic building structure[J].EngineeringMechanics,1988,5(1):93-102.(in Chinese))
[8]姚振纲,刘祖华.建筑结构试验[M].上海:同济大学出版社,1996.(YAO Zhengang,LIU Zuhua.Testsfor building structures[M].Shanghai:TongjiUniversity Press,1996.(in Chinese))
[9]吕西林,钱江,鲁亮,等.同济大学机电厂厂房框架原位推覆试验研究报告[R].上海:同济大学土木工程防灾国家重点实验室,2008.(LU Xilin,QIANJiang,LU Liang,et al.In situ pushover test report ofelectrical factory frame of Tongji University[R].Shanghai:State Key Laboratory for Disaster Reductionin Civil Engineering,Tongji University,2008.(inChinese))
[10]杨仕升,李航,韦立林,等.利用地脉动评估结构抗震能力的技术及应用前景[J].广西大学学报:自然科学版,2007,32(4):358-361.(YANG Shisheng,LIHang,WEI Lilin,et al.The technology of using micro-tremor testing methods to evaluate seismic capabilityand the technology’s application prospect[J].Journalof Guangxi University:Natural Science,2007,32(4):358-361.(in Chinese))
[11]GB 50011—2001建筑抗震设计规范[S].(GB50011—2001 Code for seismic design of buildings[S].(in Chinese))
[12]Priestley M J N,Seible F,Calvi G M.Seismic designand retrofit of bridges[M].New York:John Wiley&Sons,1996.
[13]Sezen H,Moehle J P.Shear strength model for lightlyreinforced concrete columns[J].Journal of StructuralEngineering,2004,130(11):1692-1703.
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