外方内双螺旋箍筋约束混凝土柱轴压承载力计算方法
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摘要
约束混凝土可以有效改善混凝土的承载性能和延性,被广泛应用于工程实践中。针对轴压作用下多重箍筋约束混凝土柱的极限承载力计算问题,参考Sheikh提出的有效约束模型理论,建立外方内双螺旋箍筋约束混凝土柱轴压下的约束理论模型。并以约束混凝土计算理论为基础,采用叠加原理和统一强度理论,推导该约束形式下混凝土柱的轴压承载力计算方法,应用有限元软件ABAQUS对该类新型约束混凝土柱进行数值模拟计算。结果表明:外方内双螺旋箍筋约束混凝土柱轴压承载力的理论计算值与模拟值吻合良好,且理论值偏于保守,多重约束混凝土的承载性能明显优于普通箍筋约束混凝土柱的承载性能。
Confined concrete can effectively improve the bearing capacity and ductility of the concrete performances,and it is widely used in engineering practice.Aiming at the ultimate bearing capacity of multiple stirrups confined concrete column under axial compression,the newly confined model of concrete columns reinforced with double helix stirrups and rectangular stirrups is established with reference to Sheikh's effective confined model theory.Additionally,the formula for calculating the axial compressive capacity of concrete columns under the above mentioned confined conditions is derived from combining the superposition principle and the unified strength theory based on existing calculation theory of confined concrete.The simulation analysis of the bearing capacity is carried out with the finite element analysis software ABAQUS.The analytical results show that the predicted value of the bearing capacity is in good agreement with the analytical simulated value,and the predicted bearing capacity is somewhat conservative.The performance of the concrete column confined by double helix stirrups and rectangular stirrups is much better than that of the concrete column confined by normal rectangular stirrups.
Confined concrete can effectively improve the bearing capacity and ductility of the concrete performances,and it is widely used in engineering practice.Aiming at the ultimate bearing capacity of multiple stirrups confined concrete column under axial compression,the newly confined model of concrete columns reinforced with double helix stirrups and rectangular stirrups is established with reference to Sheikh's effective confined model theory.Additionally,the formula for calculating the axial compressive capacity of concrete columns under the above mentioned confined conditions is derived from combining the superposition principle and the unified strength theory based on existing calculation theory of confined concrete.The simulation analysis of the bearing capacity is carried out with the finite element analysis software ABAQUS.The analytical results show that the predicted value of the bearing capacity is in good agreement with the analytical simulated value,and the predicted bearing capacity is somewhat conservative.The performance of the concrete column confined by double helix stirrups and rectangular stirrups is much better than that of the concrete column confined by normal rectangular stirrups.
引文
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[3]黄煜镔,钱觉时,吕伟民.基于尺寸效应的混凝土脆性评价指标分析[J].四川建筑科学研究,2005,31(3):105-108.
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[5]刘成清,徐志斌,施卫星,等.汶川地震中混凝土框架柱破坏形式及快速加固[J].建筑结构,2011,41(S1):1201-1204.
[6]Park R,Priestley M J N,Gill W D.Ductility of square-confined concrete columns[J].ASCE Journal of the Structural Division,1982,108(4):929-950.
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[9]Mander J B,Priestley M J N,Park R.Theoretical stress-strain model for confined concrete[J].ASCE Journal of Structural Engineering,1988,114(8):1804-1825.
[10]史庆轩,杨坤,刘维亚,等.高强箍筋约束高强混凝土轴心受压力学性能试验研究[J].工程力学,2012,29(1):141-149.
[11]丁慧,陈兰响,樊成.双层高强螺旋箍筋约束混凝土轴压短柱强度和延性的研究[J].水利与建筑工程学报,2015,13(3):60-65.
[12]中华人民共和国住房和城乡建设部.GB50010-2010混凝土结构设计规范(2015版)[S].北京:中国建筑工业出版社,2015.
[13]Richart F E,Brandtzaeg A,Brown R L.A study of the failure of concrete under combined compressive stresses[R].Bulletin No.185,Engineering Experiment Station,University of Illinois,Urbana,1928.
[14]Yu Maohong.Unified strength theory and its applications[M].Berlin,Heidelberg:Springer,2004.
[15]Razvi S,Saatcioglu M.Confinement model for high-strength concrete[J].ASCE Journal of Structural Engineering,1999,125(3):281-289.
[16]Cusson D,Paultre P.Stress-strain model for confined high-strength concrete[J].ASCE Journal of Structural Engineering,1995,121(3):468-477.
[17]杨坤,史庆轩,赵均海,等.高强箍筋约束高强混凝土本构模型研究[J].土木工程学报,2013,46(1):34-41.
[18]Nielsen C V.Triaxial behavior of high-strength concrete and mortar[J].ACI Materials Journal,1998,95(2):144-151.
[19]蔡绍怀,焦占拴.复式钢管混凝土柱的基本性能和承载力计算[J].建筑结构学报,1997,18(6):20-24.
[20]赵均海,郭红香,魏雪英.圆中空夹层钢管混凝土承载力研究[J].建筑科学与工程学报,2005,22(1):50-54.
[21]余志武,丁发兴.混凝土受压力学性能统一计算方法[J].土木工程学报,2003,24(4):41-46.
[2]Xu J,He X.Size effect on the strength of a concrete member[J].Engineering Fracture Mechanics,1990,35(4):687-695.
[3]黄煜镔,钱觉时,吕伟民.基于尺寸效应的混凝土脆性评价指标分析[J].四川建筑科学研究,2005,31(3):105-108.
[4]钱觉时.混凝土脆性破坏的再认识[J].重庆建筑工程学院学报,1992,14(3):9-16.
[5]刘成清,徐志斌,施卫星,等.汶川地震中混凝土框架柱破坏形式及快速加固[J].建筑结构,2011,41(S1):1201-1204.
[6]Park R,Priestley M J N,Gill W D.Ductility of square-confined concrete columns[J].ASCE Journal of the Structural Division,1982,108(4):929-950.
[7]Sheikh S A,Uzumeri S M.Strength and ductility of tied concrete columns[J].ASCE Journal of the Structural Division,1980,106(5):1079-1102.
[8]Sheikh S A,Uzumeri S M.Analytical model for concrete confinement in tied columns[J].ASCE Journal of the Structural Division,1982,108(12):2703-2722.
[9]Mander J B,Priestley M J N,Park R.Theoretical stress-strain model for confined concrete[J].ASCE Journal of Structural Engineering,1988,114(8):1804-1825.
[10]史庆轩,杨坤,刘维亚,等.高强箍筋约束高强混凝土轴心受压力学性能试验研究[J].工程力学,2012,29(1):141-149.
[11]丁慧,陈兰响,樊成.双层高强螺旋箍筋约束混凝土轴压短柱强度和延性的研究[J].水利与建筑工程学报,2015,13(3):60-65.
[12]中华人民共和国住房和城乡建设部.GB50010-2010混凝土结构设计规范(2015版)[S].北京:中国建筑工业出版社,2015.
[13]Richart F E,Brandtzaeg A,Brown R L.A study of the failure of concrete under combined compressive stresses[R].Bulletin No.185,Engineering Experiment Station,University of Illinois,Urbana,1928.
[14]Yu Maohong.Unified strength theory and its applications[M].Berlin,Heidelberg:Springer,2004.
[15]Razvi S,Saatcioglu M.Confinement model for high-strength concrete[J].ASCE Journal of Structural Engineering,1999,125(3):281-289.
[16]Cusson D,Paultre P.Stress-strain model for confined high-strength concrete[J].ASCE Journal of Structural Engineering,1995,121(3):468-477.
[17]杨坤,史庆轩,赵均海,等.高强箍筋约束高强混凝土本构模型研究[J].土木工程学报,2013,46(1):34-41.
[18]Nielsen C V.Triaxial behavior of high-strength concrete and mortar[J].ACI Materials Journal,1998,95(2):144-151.
[19]蔡绍怀,焦占拴.复式钢管混凝土柱的基本性能和承载力计算[J].建筑结构学报,1997,18(6):20-24.
[20]赵均海,郭红香,魏雪英.圆中空夹层钢管混凝土承载力研究[J].建筑科学与工程学报,2005,22(1):50-54.
[21]余志武,丁发兴.混凝土受压力学性能统一计算方法[J].土木工程学报,2003,24(4):41-46.
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