考虑损伤累积效应的SRHSHPC框架节点滞回模型研究
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摘要
为考虑反复荷载作用下累计损伤对型钢高强高性能混凝土(SRHSHPC)框架节点力学性能的影响,进行了分析研究。该文将损伤指标引入到考虑软化段的三线型滞回模型中,建立了考虑损伤累积效应的SRHSHPC框架节点荷载-位移滞回模型,并分析了轴压比和混凝土强度对节点强度退化的影响。结果表明,理论计算与试验结果吻合较好;加载后期轴压比大的节点强度退化较快;混凝土强度高的节点加载前期强度退化较小;其受力后期抵抗位移以及荷载循环次数的能力大大下降。考虑损伤累积效应的滞回模型较为准确地模拟了SRHSHPC框架节点在反复荷载作用下的滞回性能,反映了框架节点产生损伤后其强度和刚度的退化规律,可为SRHSHPC结构的非线性地震反应分析提供理论依据。
In order to reflect the effects of accumulative damage of steel reinforced high strength and high performance concrete(SRHSHPC) frame joints on the mechanical properties such as the strength and stiffness degradation under reversed load,a damage index(D) is introduced into the hysteretic model of SRHSHPC frame joints.Then a trilinear load-displacement hysteretic model of SRHSHPC frame joints considering the accumulative damage is proposed,which could reveal the strength and stiffness degradation of SRHSHPC frame joints.At the same time,the influences of axial compression ratio and concrete strength on the strength degradation of SRHSHPC frame joints are analyzed.The calculated results tally with the experimental results well,and it is showed that the proposed hysteretic model considering the accumulative damage has a considerable precision.
In order to reflect the effects of accumulative damage of steel reinforced high strength and high performance concrete(SRHSHPC) frame joints on the mechanical properties such as the strength and stiffness degradation under reversed load,a damage index(D) is introduced into the hysteretic model of SRHSHPC frame joints.Then a trilinear load-displacement hysteretic model of SRHSHPC frame joints considering the accumulative damage is proposed,which could reveal the strength and stiffness degradation of SRHSHPC frame joints.At the same time,the influences of axial compression ratio and concrete strength on the strength degradation of SRHSHPC frame joints are analyzed.The calculated results tally with the experimental results well,and it is showed that the proposed hysteretic model considering the accumulative damage has a considerable precision.
引文
[1]郑山锁,曾磊,吕营,等.型钢高强高性能混凝土框架节点抗震性能试验研究[J].建筑结构学报,2008,29(3):128-136.
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[6]Ming-Liang Wang,Surendra P Shah.Reinforced concrete hysteresismodel based on the damage concept[J].Earthquake Engineering&Structural Dynamics.1987,15(8):993-1003.
[7]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44-54.
[8]Park Y J,Ang A H-S.Mechanical seismic damage model for rein-forced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722-739.
[9]顾祥林,黄庆华,吴周亻思.钢筋混凝土柱考虑损伤累积的反复荷载-位移关系分析[J].地震工程与工程振动,2006,26(4):68-74.
[10]李俊华,王新堂,薛建阳,等.低周反复荷载下型钢高强混凝土柱受力性能试验研究[J].土木工程学报,2007,40(7):11-18.
[2]李洪泉,贲庆国,于之绰,等.钢框架结构在地震作用下累积损伤分析及试验研究[J].建筑结构学报,2004,25(3):69-74.
[3]徐亚丰,汤泓,陈兆才,等.钢骨高强混凝土框架节点恢复力模型的研究[J].兰州理工大学学报,2004,30(5):116-118.
[4]郭子雄,杨勇.恢复力模型研究现状及存在问题[J].世界地震工程,2004,20(4):47-51.
[5]曾磊.型钢高强高性能混凝土框架节点抗震性能及设计计算理论研究[D].西安:西安建筑科技大学,2008.
[6]Ming-Liang Wang,Surendra P Shah.Reinforced concrete hysteresismodel based on the damage concept[J].Earthquake Engineering&Structural Dynamics.1987,15(8):993-1003.
[7]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44-54.
[8]Park Y J,Ang A H-S.Mechanical seismic damage model for rein-forced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722-739.
[9]顾祥林,黄庆华,吴周亻思.钢筋混凝土柱考虑损伤累积的反复荷载-位移关系分析[J].地震工程与工程振动,2006,26(4):68-74.
[10]李俊华,王新堂,薛建阳,等.低周反复荷载下型钢高强混凝土柱受力性能试验研究[J].土木工程学报,2007,40(7):11-18.
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