既有钢筋混凝土框架抗剪能力分析
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摘要
为研究既有结构地震损伤直至破坏的特点,选取1栋20世纪80年代初建造的钢筋混凝土框架结构的一榀单跨平面框架进行Pushover分析。基于OpenSees分析平台,得出结构破坏过程中塑性铰截面处的剪力需求,并与现行规范中的截面抗剪能力进行比较。研究结果表明:结构在出现塑性铰的过程中,将出现脆性剪切破坏;结构的破坏机理是底层柱发生弯曲-剪切破坏。建议对既有建筑结构进行抗震评估时,必须考虑梁、柱剪切破坏模式。该方法可用于结构抗剪能力及延性的初步评估。
Pushover analysis was performed to study the seismic damage and failure pattern of aged existing building structures during earthquake. The target structure was a single-span,single-bay reinforced concrete frame built in early 80's of the 20th centenary. By using OpenSees software,the shear demand at plastic hinges of the damaged structure was obtained and compared with the shear capacity in the current design code. The results show that the brittle shear failure may occur at some plastic hinges,and that final breakdown of the structure is caused by the shear-bending failure occurring at the first story columns. The structural displacement limit for shear resistance is also proposed. The shear failure model of beam and column should be taken into account for seismic assessment of existing aged building structures. The proposed method is applicable to preliminary evaluation of structural shear capacity and ductility.
Pushover analysis was performed to study the seismic damage and failure pattern of aged existing building structures during earthquake. The target structure was a single-span,single-bay reinforced concrete frame built in early 80's of the 20th centenary. By using OpenSees software,the shear demand at plastic hinges of the damaged structure was obtained and compared with the shear capacity in the current design code. The results show that the brittle shear failure may occur at some plastic hinges,and that final breakdown of the structure is caused by the shear-bending failure occurring at the first story columns. The structural displacement limit for shear resistance is also proposed. The shear failure model of beam and column should be taken into account for seismic assessment of existing aged building structures. The proposed method is applicable to preliminary evaluation of structural shear capacity and ductility.
引文
[1]王亚勇.汶川地震建筑震害启示——抗震概念设计[J].建筑结构学报,2008,29(4):20-25.WANG Ya-yong.Lessons learnt from building damages in the Wenchuan earthquake:Seismic concept design of buildings[J].Journal of Building Structures,2008,29(4):20-25.
[2]清华大学土木结构组,西南交通大学土木结构组,北京交通大学土木结构组.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,Xinan Jiaotong University and Beijing Jiaotong University.Analysis on seismic damage of buildings in the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):1-9.
[3]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.YE Lie-ping,QU Zhe,LU Xin-zheng,et al.Collapse prevention of building structures:A lesson from the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):42-50.
[4]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.LI Hong-nan,XIAO Shi-yun,HUO Lin-sheng.Damage investigation and analysis of engineering structures in the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):10-19.
[5]冯远,肖克艰,刘宜丰.汶川地震灾害引发建筑结构设计者的思考[J].建筑结构,2008,38(7):25-27.FENG Yuan,XIAO Ke-jian,LIU Yi-feng.Thinking of structural designer from Wenchuan earthquake[J].Building Structure,2008,38(7):25-27.
[6]江见鲸,李杰,金伟良.高等混凝土结构理论[M].北京:中国建筑工业出版社,2007:153-183.JIANG Jian-jing,LI Jie,JING Wei-liang.Advanced theory of reinforced concrete structures[M].Beijing:China Architecture&Building Press,2007:153-183.
[7]雷拓,吕西林,钱江,等.既有钢筋混凝土框架原位推覆试验研究[J].建筑结构学报,2009,30(5):23-30.LEI Tuo,LüXi-lin,QIAN Jiang,et al.In-situ pushover test of an existing reinforced concrete frame[J].Journal of Building Structures,2009,30(5):23-30.
[8]Priestley M J N,Verma R,XIAO Yan.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1994,120(8):2310-2329.
[9]Priestley M J N,Verma R,XIAO Yan.Closure to“Seismic shear strength of reinforced concrete columns”by Priestley M J N,Verma R,XIAO Yan[J].Journal of Structural Engineering,1996,122(4):464-467.
[10]DGJ08-9—2003,建筑抗震设计规程[S].DGJ08-9—2003,Code for seismic design of buildings[S].
[11]FEMA273,NEHRP guidelines for the seismic rehabilitation of buildings[S].
[12]Spacone E,Filippou F C,Taucer F F.Fiber beam-column model for nonlinear analysis of concrete reinforced frames,Part I:Formulation[J].Earthquake Engineering and Structural Dynamics,1996,25:711-725.
[13]CEB Bulletin236,Seismic design of reinforced concrete structures for controlled inelastic response-Recent advances indesign concepts and codes[S].
[14]Paulay T,Priestley M J N.钢筋混凝土和砌体的抗震结构设计[M].戴瑞同,陈世鸣,林宗凡,等译.北京:中国建筑工业出版社,1999:84-85.Paulay T,Priestley M J N.Seismic design of reinforced concrete and masonry buildings[M].DAI Rui-tong,CHEN Shi-ming,LIN Zong-fan,et al,trans.Beijing:China Architecture&Building Press,1999:84-85.
[15]GB50010—2002,混凝土结构设计规范[S].GB50010—2002,Code for design of concrete structures[S].
[16]Sezen H,Moehle J P.Shear strength model for lightly reinforced concrete columns[J].Journal of Structural Engineering,2004,130(11):1692-1703.
[17]Priestley M J N,Seible F,Calvi G M.桥梁抗震设计与加固[M].袁万城,胡勃,崔飞,等译.北京:人民交通出版社,1997:223-232,379-380.Priestley M J N,Seible F,Calvi G M.Seismic design and retrofit of bridges[M].YUAN Wan-cheng,HU Bo,CUI Fei,et al,trans.Beijing:China Communications Press,1997:223-232,379-380.
[2]清华大学土木结构组,西南交通大学土木结构组,北京交通大学土木结构组.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,Xinan Jiaotong University and Beijing Jiaotong University.Analysis on seismic damage of buildings in the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):1-9.
[3]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.YE Lie-ping,QU Zhe,LU Xin-zheng,et al.Collapse prevention of building structures:A lesson from the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):42-50.
[4]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.LI Hong-nan,XIAO Shi-yun,HUO Lin-sheng.Damage investigation and analysis of engineering structures in the Wenchuan earthquake[J].Journal of Building Structures,2008,29(4):10-19.
[5]冯远,肖克艰,刘宜丰.汶川地震灾害引发建筑结构设计者的思考[J].建筑结构,2008,38(7):25-27.FENG Yuan,XIAO Ke-jian,LIU Yi-feng.Thinking of structural designer from Wenchuan earthquake[J].Building Structure,2008,38(7):25-27.
[6]江见鲸,李杰,金伟良.高等混凝土结构理论[M].北京:中国建筑工业出版社,2007:153-183.JIANG Jian-jing,LI Jie,JING Wei-liang.Advanced theory of reinforced concrete structures[M].Beijing:China Architecture&Building Press,2007:153-183.
[7]雷拓,吕西林,钱江,等.既有钢筋混凝土框架原位推覆试验研究[J].建筑结构学报,2009,30(5):23-30.LEI Tuo,LüXi-lin,QIAN Jiang,et al.In-situ pushover test of an existing reinforced concrete frame[J].Journal of Building Structures,2009,30(5):23-30.
[8]Priestley M J N,Verma R,XIAO Yan.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1994,120(8):2310-2329.
[9]Priestley M J N,Verma R,XIAO Yan.Closure to“Seismic shear strength of reinforced concrete columns”by Priestley M J N,Verma R,XIAO Yan[J].Journal of Structural Engineering,1996,122(4):464-467.
[10]DGJ08-9—2003,建筑抗震设计规程[S].DGJ08-9—2003,Code for seismic design of buildings[S].
[11]FEMA273,NEHRP guidelines for the seismic rehabilitation of buildings[S].
[12]Spacone E,Filippou F C,Taucer F F.Fiber beam-column model for nonlinear analysis of concrete reinforced frames,Part I:Formulation[J].Earthquake Engineering and Structural Dynamics,1996,25:711-725.
[13]CEB Bulletin236,Seismic design of reinforced concrete structures for controlled inelastic response-Recent advances indesign concepts and codes[S].
[14]Paulay T,Priestley M J N.钢筋混凝土和砌体的抗震结构设计[M].戴瑞同,陈世鸣,林宗凡,等译.北京:中国建筑工业出版社,1999:84-85.Paulay T,Priestley M J N.Seismic design of reinforced concrete and masonry buildings[M].DAI Rui-tong,CHEN Shi-ming,LIN Zong-fan,et al,trans.Beijing:China Architecture&Building Press,1999:84-85.
[15]GB50010—2002,混凝土结构设计规范[S].GB50010—2002,Code for design of concrete structures[S].
[16]Sezen H,Moehle J P.Shear strength model for lightly reinforced concrete columns[J].Journal of Structural Engineering,2004,130(11):1692-1703.
[17]Priestley M J N,Seible F,Calvi G M.桥梁抗震设计与加固[M].袁万城,胡勃,崔飞,等译.北京:人民交通出版社,1997:223-232,379-380.Priestley M J N,Seible F,Calvi G M.Seismic design and retrofit of bridges[M].YUAN Wan-cheng,HU Bo,CUI Fei,et al,trans.Beijing:China Communications Press,1997:223-232,379-380.
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