玄武岩纤维加固震损三维混凝土框架节点抗震试验
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摘要
通过5组三维混凝土框架节点试验,研究玄武岩纤维加固后节点的抗震性能.分别进行了模拟地震的预损伤试验、构件加固和加固后的低周反复试验,探讨不同损伤程度、不同裂缝处理方法对三维框架节点抗震性能的影响.通过对节点的滞回&骨架曲线、延性系数、承载力及刚度退化等参数分析可知:玄武岩纤维加固对提高节点承载力作用有限,但对提高抗震性能效果明显,节点的抗震性能恢复并超过了受损前,加固后节点由"弱柱强梁"转变成了"强柱弱梁"的破坏形式,说明该加固方法是合理而有效的.
A total of five repaired beam-column joints(B-CJs) were pre-damaged under cyclic loads in order to study on the seismic behavior.The experimental study including pre-damage,rehabilitation and re-test under cyclic loads concentrated on the effect on different levels of pre-damage and epoxy injection.Through the test data,namely the hysteresis curves,ductility,ultimate strength and stiffness degradation,etc,the following conclusion is drawn that the rehabilitation with basalt fiber sheets has notable influence on the seismic performance of joints,but ultimate loads limited.The repaired B-CJs can reach or even exceed the level of their original seismic performance before pre-damage.The failure mode of strong beam and weak column is changed into strong column and weak beam after rehabilitations.The proper method is used in need for strengthening the damaged joints.
A total of five repaired beam-column joints(B-CJs) were pre-damaged under cyclic loads in order to study on the seismic behavior.The experimental study including pre-damage,rehabilitation and re-test under cyclic loads concentrated on the effect on different levels of pre-damage and epoxy injection.Through the test data,namely the hysteresis curves,ductility,ultimate strength and stiffness degradation,etc,the following conclusion is drawn that the rehabilitation with basalt fiber sheets has notable influence on the seismic performance of joints,but ultimate loads limited.The repaired B-CJs can reach or even exceed the level of their original seismic performance before pre-damage.The failure mode of strong beam and weak column is changed into strong column and weak beam after rehabilitations.The proper method is used in need for strengthening the damaged joints.
引文
[1]叶列平,曲哲,马千里,等.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52.YE Lieping,QU Zhe,MA Qianli,et al.Study on ensuring thestrong column-weak beam mechanism for RC frames based onthe damage analysis in the Wenchuan earthquake[J].BuildingStructure,2008,38(11):52.
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[3]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.WANG Yayong.Lessons learnt from building damages in theWenchuan earthquake-seismic concept design of buildings[J].Journal of Building Structures,2008,29(4),20.
[4]王亚勇.汶川地震建筑震害启示——三水准设防和抗震设计基本要求[J].建筑结构学报,2008,29(4):26.WANG Yayong.Lessons learnt from building damages in theWenchuan earthquake—three earthquake performanceobjectives and basic requirements for seismic design ofbuildings[J].Journal of Building Structures,2008,29(4),26.
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[6]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,12(3):11.JIANG Yongsheng,CHEN Zhongfan,ZHOU Xuping.et al.Aseismic research on RC frame joint of monolithically castedslab[J].Journal of Building Structures,1994,12(3),11.
[7]Ammerman O V,Wolfgram-French C.R/C beam-column-slabsubassemblages subjected to lateral loads[J].Journal ofStructural Engineering,1989,115(6):1298.
[8]Parvin Azadeh,WU Shanhong.Ply angle effect on fibercomposite wrapped reinforced concrete beam-columnconnections under combined axial and cyclic loads[J].Composite Structures,2008,82(2):532.
[9]Abhijit Mukherjee,Mangesh Joshi.FRPC reinforced concretebeam-column joints under cyclic excitation[J].CompositeStructures,2005,70(9):185.
[10]Adin M A,Yankelevsky D Z,Farhey D N.Cyclic behavior ofepoxy repaired reinforced concrete beam-column joints[J].Struct J ACI,1993,90(2):170.
[11]洪涛.碳纤维加固震损混凝土框架节点抗震性能试验研究[D].上海:同济大学土木工程学院,2002.HONG Tao.A study on performance of injured interior column-beam-slab subassemblies rehabilitated by pasted carbon fiberreinforced plastics[D].Shanghai:Tongji University.College ofCivil Engineering,2002.
[12]卢亦焱,陈少雄,赵国藩.外包钢与碳纤维布复合加固钢筋混凝土柱抗震性能试验研究[J].土木工程学报,2005,38(5):10.LU Yiyan,CHEN Shaoxiong,ZHAO Guofan.An experimentalstudy on the seismic behavior of reinforced concrete columnstrenthened with bonded steel hoops and carbon fiber reinforcedpolymer sheet[J].China Civil Engineering Journal,2005,38(5):10.
[13]Xiao Y,Wu H,Matin G R.Prefabricated composite jacketing ofRC columns for enhanced shear strength[J].Journal ofStructural Engineering,ASCE,1999,125(3):1357.
[14]吴刚,吕志涛,蒋剑彪.碳纤维布加固钢筋混凝土柱抗震性能的试验研究[J].建筑结构,2002,32(10):42.WU Gang,LV Zhitao,JIANG Jianbiao.Experimental study onthe seismic behavior of RC columns strengthened with carbonfiber sheet[J].Building Structure,2002,32(10):42.
[15]Sim Jongsung,Park Cheolwoo,Do Youngmoon.Characteristicsof basalt fiber as a strengthening material for concretestructures[J].J Simetal Composites,2005,36(B):504.
[16]吴刚,魏洋,吴智深,等.玄武岩纤维与碳纤维加固混凝土矩形柱抗震性能比较研究[J].工业建筑,2007,37(6):14.WU Gang,WEI Yang,WU Zhishen,et al.Comparative study onseimic performance of rectangular concrete columnsstrengthened with BFRP and CFRP composites[J].IndustrialConstruction,2007,37(6):14.
[17]吴刚,顾冬生,吴智深,等.玄武岩纤维与碳纤维加固混凝土圆形柱抗震性能比较研究[J].工业建筑,2007,37(6):19.WU Gang,GU Dongsheng,WU Zhishen,et al.Comparativestudy on seimic performance of circle concrete columnsstrengthened with BFRP and CFRP composites[J].IndustrialConstruction,2007,37(6):19.
[18]欧阳煜,张云超,李翔.玄武岩纤维布加固钢筋混凝土梁抗剪试验研究[J].工业建筑,2009,39(1):134.OUYANG Yu,ZHANG Yunchao,LI Xiang.The research on shearcapacity of RC beams strenthened with BFRP sheets[J].Industrial Construction,2009,39(1):134.
[19]程莉.玄武岩纤维加固震损混凝土框架节点抗震性能试验研究[D].上海:同济大学土木工程学院,2008.CHENG Li.Investigation of BFRP-reinforced pre-damagedconcrete beam-column joints under reversed cyclic loading[D].Shanghai:Tongji University.College of Civil Engineering,2008.
[2]中华人民共和国建设部.GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2008.National Standard of the People’s Republic of China.GB50011—2001Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2008.
[3]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.WANG Yayong.Lessons learnt from building damages in theWenchuan earthquake-seismic concept design of buildings[J].Journal of Building Structures,2008,29(4),20.
[4]王亚勇.汶川地震建筑震害启示——三水准设防和抗震设计基本要求[J].建筑结构学报,2008,29(4):26.WANG Yayong.Lessons learnt from building damages in theWenchuan earthquake—three earthquake performanceobjectives and basic requirements for seismic design ofbuildings[J].Journal of Building Structures,2008,29(4),26.
[5]叶列平,程光煜,陆新征,等.论建筑结构抗震的鲁棒性[J].建筑结构,2008,38(6),11.YE Lieping,CHENG Guangyu,LU Xinzheng,et al.Introductionof robustness for seismic structures[J].Building Structure,2008,38(6):11.
[6]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,12(3):11.JIANG Yongsheng,CHEN Zhongfan,ZHOU Xuping.et al.Aseismic research on RC frame joint of monolithically castedslab[J].Journal of Building Structures,1994,12(3),11.
[7]Ammerman O V,Wolfgram-French C.R/C beam-column-slabsubassemblages subjected to lateral loads[J].Journal ofStructural Engineering,1989,115(6):1298.
[8]Parvin Azadeh,WU Shanhong.Ply angle effect on fibercomposite wrapped reinforced concrete beam-columnconnections under combined axial and cyclic loads[J].Composite Structures,2008,82(2):532.
[9]Abhijit Mukherjee,Mangesh Joshi.FRPC reinforced concretebeam-column joints under cyclic excitation[J].CompositeStructures,2005,70(9):185.
[10]Adin M A,Yankelevsky D Z,Farhey D N.Cyclic behavior ofepoxy repaired reinforced concrete beam-column joints[J].Struct J ACI,1993,90(2):170.
[11]洪涛.碳纤维加固震损混凝土框架节点抗震性能试验研究[D].上海:同济大学土木工程学院,2002.HONG Tao.A study on performance of injured interior column-beam-slab subassemblies rehabilitated by pasted carbon fiberreinforced plastics[D].Shanghai:Tongji University.College ofCivil Engineering,2002.
[12]卢亦焱,陈少雄,赵国藩.外包钢与碳纤维布复合加固钢筋混凝土柱抗震性能试验研究[J].土木工程学报,2005,38(5):10.LU Yiyan,CHEN Shaoxiong,ZHAO Guofan.An experimentalstudy on the seismic behavior of reinforced concrete columnstrenthened with bonded steel hoops and carbon fiber reinforcedpolymer sheet[J].China Civil Engineering Journal,2005,38(5):10.
[13]Xiao Y,Wu H,Matin G R.Prefabricated composite jacketing ofRC columns for enhanced shear strength[J].Journal ofStructural Engineering,ASCE,1999,125(3):1357.
[14]吴刚,吕志涛,蒋剑彪.碳纤维布加固钢筋混凝土柱抗震性能的试验研究[J].建筑结构,2002,32(10):42.WU Gang,LV Zhitao,JIANG Jianbiao.Experimental study onthe seismic behavior of RC columns strengthened with carbonfiber sheet[J].Building Structure,2002,32(10):42.
[15]Sim Jongsung,Park Cheolwoo,Do Youngmoon.Characteristicsof basalt fiber as a strengthening material for concretestructures[J].J Simetal Composites,2005,36(B):504.
[16]吴刚,魏洋,吴智深,等.玄武岩纤维与碳纤维加固混凝土矩形柱抗震性能比较研究[J].工业建筑,2007,37(6):14.WU Gang,WEI Yang,WU Zhishen,et al.Comparative study onseimic performance of rectangular concrete columnsstrengthened with BFRP and CFRP composites[J].IndustrialConstruction,2007,37(6):14.
[17]吴刚,顾冬生,吴智深,等.玄武岩纤维与碳纤维加固混凝土圆形柱抗震性能比较研究[J].工业建筑,2007,37(6):19.WU Gang,GU Dongsheng,WU Zhishen,et al.Comparativestudy on seimic performance of circle concrete columnsstrengthened with BFRP and CFRP composites[J].IndustrialConstruction,2007,37(6):19.
[18]欧阳煜,张云超,李翔.玄武岩纤维布加固钢筋混凝土梁抗剪试验研究[J].工业建筑,2009,39(1):134.OUYANG Yu,ZHANG Yunchao,LI Xiang.The research on shearcapacity of RC beams strenthened with BFRP sheets[J].Industrial Construction,2009,39(1):134.
[19]程莉.玄武岩纤维加固震损混凝土框架节点抗震性能试验研究[D].上海:同济大学土木工程学院,2008.CHENG Li.Investigation of BFRP-reinforced pre-damagedconcrete beam-column joints under reversed cyclic loading[D].Shanghai:Tongji University.College of Civil Engineering,2008.
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