汶川地震典型RC框架结构抗倒塌加固效果分析
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摘要
以汶川地震震中附近的一栋典型RC框架结构为背景,分别采用普通支撑、防屈曲支撑(BRB)和粘滞阻尼器支撑3种加固方案来提高其抗震能力,并采用基于动力增量分析(IDA)的地震倒塌易损性分析方法,对各种加固方案的抗倒塌能力及其影响参数进行了分析。结果表明:以结构抗倒塌能力为目标,粘滞阻尼器支撑加固方案的效果优于BRB加固方案,而BRB方案的加固效果要优于普通支撑加固方案;相同参数情况下,A型支撑布置方案的加固效果优于X型支撑加固。
Taking a typical reinforced concrete(RC) frame structure that was close to the epicenter during the Wenchuan Earthquake as background,the seismic collapse resistance of the frame was strengthened by attached substructures,including conventional brace,buckling-restrained brace(BRB) and viscous damper brace.Seismic collapse fragility analysis method based on incremental dynamic analysis(IDA) was implemented for each strengthening scheme to compare their effects and to analyze the influence of critical parameters.The results show that the viscous damper brace strengthening scheme performs better than the BRB,and the BRB performs better than conventional brace.With the same strengthening parameters,the strengthening effect of A-shaped bracing scheme is better than that of the X-shaped scheme.
Taking a typical reinforced concrete(RC) frame structure that was close to the epicenter during the Wenchuan Earthquake as background,the seismic collapse resistance of the frame was strengthened by attached substructures,including conventional brace,buckling-restrained brace(BRB) and viscous damper brace.Seismic collapse fragility analysis method based on incremental dynamic analysis(IDA) was implemented for each strengthening scheme to compare their effects and to analyze the influence of critical parameters.The results show that the viscous damper brace strengthening scheme performs better than the BRB,and the BRB performs better than conventional brace.With the same strengthening parameters,the strengthening effect of A-shaped bracing scheme is better than that of the X-shaped scheme.
引文
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[2]清华大学、西南交通大学、北京交通大学土木工程结构专家组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.Civil and Structural Groups of Tsinghua University,Southwest Jiaotong University and Beijing JiaotongUniversity.Analysis on Seismic Damage of Buildingsin the Wenchuan Earthquake[J].Journal of BuildingStructures,2008,29(4):1-9.
[3]叶列平,陆新征,赵世春,等.框架结构抗地震倒塌能力的研究——汶川地震极震区几个框架结构震害案例分析[J].建筑结构学报,2009,30(6):67-76.YE Lie-ping,LU Xin-zheng,ZHAO Shi-chun,et al.Seismic Collapse Resistance of RC Frame Struc-tures—Case Studies on Seismic Damages of SeveralRC Frame Structures Under Extreme Ground Motionin Wenchuan Earthquake[J].Journal of BuildingStructures,2009,30(6):67-76.
[4]叶列平,李易,潘鹏.漩口中学建筑震害调查分析[J].建筑结构,2009,39(11):54-57,29.YE Lie-ping,LI Yi,PAN Peng.Seismic Damages ofBuilding Structures of Xuankou Middle School inYingxiu Town[J].Building Structure,2009,39(11):54-57,29.
[5]陆新征,叶列平.基于IDA分析的结构抗地震倒塌能力研究[J].工程抗震与加固改造,2010,32(1):13-18.LU Xin-zheng,YE Lie-ping.Study on the SeismicCollapse Resistance of Structural System[J].Earth-quake Resistant Engineering and Retrofitting,2010,32(1):13-18.
[6]马玉虎.汶川地震典型框架结构震害分析和防倒塌对策研究[D].北京:清华大学,2010.MA Yu-hu.Seismic Damage Simulation and CollapseResistance Strategies of Typical RC Frames Duringthe Great Wenchuan Earthquake[D].Beijing:Tsing-hua University,2010.
[7]ATC-63,Quantification of Building Seismic Perform-ance Factors[S].
[8]陆新征,叶列平,缪志伟.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2009.LU Xin-zheng,YE Lie-ping,MIAO Zhi-wei.Elasto-plastic Analysis of Buildings Against Earthquake[M].Beijing:China Architecture&Building Press,2009.
[9]BOUSALEM B,CHIKH N.Development of a Con-fined Model for Rectangular Ordinary ReinforcedConcrete Columns[J].Materials and Structures,2007,40(6):605-613.
[10]程光煜.基于能量抗震设计方法及其在钢支撑框架结构中的应用[D].北京:清华大学,2007.CHENG Guang-yu.Study on Energy-based SeismicDesign Methodology and Application in Steel BracedFrames[D].Beijing:Tsinghua University,2007.
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