再生混凝土长柱的抗震性能试验研究
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摘要
为研究再生混凝土框架柱的抗震性能,对剪跨比为4、截面尺寸为450 mm×450 mm的6根再生混凝土柱和1根普通混凝土柱进行低周反复荷载试验.试验参数主要为纵筋率、轴压比、箍筋加密区的体积配箍率,其中配箍率的取值与国家规范的要求接近.结果表明,低轴压、低配箍的再生混凝土柱可实现良好的延性和变形性能,能满足抗震设计的要求;较高轴压、低配箍的再生混凝土柱最终发生剪切压溃,呈现出显著的脆性性质;较高轴压的再生混凝土柱在提高配箍后,延性与耗能性能得以改善.建议轴压比不宜过大,并适当提高配箍要求.此外,分析表明再生混凝土柱极限受弯承载力的计算可采用与普通混凝土柱类似的方法,通过考虑钢筋强化、合理选取再生混凝土的本构模型进行准确计算.
To study the seismic behavior of recycled concrete frame columns,six recycled concrete columns and one normal concrete column are tested under low-cycle reversed loading.The columns are 450 mm×450 mm in cross section and the shear span ratio is 4.The test parameters mainly include longitudinal steel ratio,axial load ratio and stirrup reinforcement ratio in potential plastic region.In this test,the stirrup reinforcement ratios of columns are close to the limit requirements of Chinese code.The experimental results show that the columns with small axial load and low stirrup reinforcement ratio can achieve satisfactory ductility and ultimate deformability,which can meet the requirements of seismic design.However,the columns with high axial load and low stirrup reinforcement ratio exhibit obvious brittle behavior and the shear crushing is observed at final failure.After improving the stirrup reinforcement ratio of the columns with high axial load,its ductility and energy dissipation behavior become better.It is recommended that the axial load ratio should not be too large,and the confinement requirement should be improved.Moreover,analyses show that the calculation of the ultimate flexural capacity of recycled concrete columns can use similar method to that of normal concrete columns,and it can be accurately calculated by considering the strain hardening of longitudinal steel and appropriately choosing the stress-strain model of recycled concrete.
To study the seismic behavior of recycled concrete frame columns,six recycled concrete columns and one normal concrete column are tested under low-cycle reversed loading.The columns are 450 mm×450 mm in cross section and the shear span ratio is 4.The test parameters mainly include longitudinal steel ratio,axial load ratio and stirrup reinforcement ratio in potential plastic region.In this test,the stirrup reinforcement ratios of columns are close to the limit requirements of Chinese code.The experimental results show that the columns with small axial load and low stirrup reinforcement ratio can achieve satisfactory ductility and ultimate deformability,which can meet the requirements of seismic design.However,the columns with high axial load and low stirrup reinforcement ratio exhibit obvious brittle behavior and the shear crushing is observed at final failure.After improving the stirrup reinforcement ratio of the columns with high axial load,its ductility and energy dissipation behavior become better.It is recommended that the axial load ratio should not be too large,and the confinement requirement should be improved.Moreover,analyses show that the calculation of the ultimate flexural capacity of recycled concrete columns can use similar method to that of normal concrete columns,and it can be accurately calculated by considering the strain hardening of longitudinal steel and appropriately choosing the stress-strain model of recycled concrete.
引文
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[7]Poon Chisun,Kou Shicong.Effects of fly ash on me-chanical properties of 10-year-old concrete prepared w ithrecycled concrete aggregates[C]//Proceedings of the2nd International Conference on Waste Engineering andManagement.Shanghai,China,2010:46-59.
[8]彭有开.再生混凝土框架柱抗震性能试验研究[D].北京:北京建筑工程学院土木与交通工程学院,2011.
[9]中华人民共和国建设部.JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.
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[11]Mander J B,Priestley M J N,Park R.Observedstress-strain behavior of confined concrete[J].Jour-nal of Structural Engineering,1988,114(8):1827-1849.
[12]Mander J B,Priestley M J N,Park R.Theoreticalstress-strain model for confined concrete[J].Journalof Structural Engineering,1988,114(8):1804-1826.
[13]Esmaeily A.Seismic behavior of bridge columns sub-jected to various loading patterns[D].Los Angeles,CA,USA:University of Southern California,2001.
[2]白国良,刘超,赵洪金,等.再生混凝土框架柱抗震性能试验研究[J].地震工程与工程振动,2011,31(1):61-66.Bai Guoliang,Liu Chao,Zhao Hongjin,et al.Experi-mental research on seismic behavior of recycled concreteframe columns[J].Journal of Earthquake Engineeringand Engineering Vibration,2011,31(1):61-66.(inChinese)
[3]胡琼,卢锦.再生混凝土柱抗震性能试验[J].哈尔滨工业大学学报,2012,44(2):23-27.Hu Qiong,Lu Jin.Experimental research on hystereticbehavior of recycled concrete[J].Journal of Harbin In-stitute of Technology,2012,44(2):23-27.(in Chi-nese)
[4]Xiao Jianzhuang,Huang Xiao,Shen Luming.Seismicbehavior of semi-precast column w ith recycled aggregateconcrete[J].Construction and Building Materials,2012,35:988-1001.
[5]程文瀼,李爱群,张晓峰,等.钢筋砼柱的轴压比限值[J].建筑结构学报,1994,15(6):25-30.Cheng Wenrang,Li Aiqun,Zhang Xiaofeng,et al.Limit values of axial compression ratio for reinforcedconcrete columns[J].Journal of Building Structure,1994,15(6):25-30.(in Chinese)
[6]中华人民共和国住房和城乡建设部.GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2011.
[7]Poon Chisun,Kou Shicong.Effects of fly ash on me-chanical properties of 10-year-old concrete prepared w ithrecycled concrete aggregates[C]//Proceedings of the2nd International Conference on Waste Engineering andManagement.Shanghai,China,2010:46-59.
[8]彭有开.再生混凝土框架柱抗震性能试验研究[D].北京:北京建筑工程学院土木与交通工程学院,2011.
[9]中华人民共和国建设部.JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.
[10]Park R,Priestley M J N,Gill W D.Ductility ofsquare-confined concrete columns[J].Journal ofStructural Division,ASCE,1982,108(4):929-950.
[11]Mander J B,Priestley M J N,Park R.Observedstress-strain behavior of confined concrete[J].Jour-nal of Structural Engineering,1988,114(8):1827-1849.
[12]Mander J B,Priestley M J N,Park R.Theoreticalstress-strain model for confined concrete[J].Journalof Structural Engineering,1988,114(8):1804-1826.
[13]Esmaeily A.Seismic behavior of bridge columns sub-jected to various loading patterns[D].Los Angeles,CA,USA:University of Southern California,2001.
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