地震作用下钢筋混凝土柱受力性能研究
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摘要
采用多弹簧模型对钢筋混凝土柱在水平反复荷载作用下的受力过程进行了数值模拟。数值模拟结果与试验结果对比表明,所建多弹簧计算模型较好地反映了钢筋混凝土柱的受力性能。针对目前钢筋混凝土柱试验研究的不足,选取轴压比、加载路径、加载幅值、荷载循环次数、变轴力等进行参数研究。研究发现:地震作用下大轴压比柱延性较小,对抗震不利;双向加载时,随两方向幅值比减小,矩形和菱形加载路径下柱的延性显著减小;加载幅值增量及荷载循环次数的变化对柱骨架曲线形状影响不明显;变轴力加载下柱的滞回性能表现出明显的不对称性,但柱滞回耗能和极限位移与定轴力加载情况基本一致。
Based on the multi-spring model, numerical simulation calculations for RC columns under reversed loading were carried out. The applied analytical model was verified by comparing the numerical results with the test data. In allusion to the deficiency in test, the parameter study was performed including the axial load ratio, loading path, loading amplitude, loading cycle number as well as variable axial forces. It is shown that the ductility of the columns with a large axial load ratio is significantly reduced. The ductility of columns under rectangular and diamond loading paths decreases rapidly as the amplitude ratio between two loading directions decreases. Varying the amplitude increment and the loading cycle number has little effect on the figures of skeleton curves. It is also shown that RC columns subjected to variable axial force loading exhibit an asymmetric hysteretic behavior, while the energy dissipation and the ultimate displacement are in substantial agreement with the ones subjected to constant axial forces.
Based on the multi-spring model, numerical simulation calculations for RC columns under reversed loading were carried out. The applied analytical model was verified by comparing the numerical results with the test data. In allusion to the deficiency in test, the parameter study was performed including the axial load ratio, loading path, loading amplitude, loading cycle number as well as variable axial forces. It is shown that the ductility of the columns with a large axial load ratio is significantly reduced. The ductility of columns under rectangular and diamond loading paths decreases rapidly as the amplitude ratio between two loading directions decreases. Varying the amplitude increment and the loading cycle number has little effect on the figures of skeleton curves. It is also shown that RC columns subjected to variable axial force loading exhibit an asymmetric hysteretic behavior, while the energy dissipation and the ultimate displacement are in substantial agreement with the ones subjected to constant axial forces.
引文
[1]邱法维,李文峰,潘鹏.钢筋混凝土柱的双向拟静力实验研究[J].建筑结构学报,2001,22(5):26―31.Qiu Fawei,Li Wenfeng,Pan Peng.Quasi-static test research of reinforced concrete column under biaxial loading[J].Journal of Building Structures,2001,22(5):26―31.(in Chinese)
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[4]黄翔.规则变轴力下钢筋砼框架柱的抗震性能研究[J].福建建筑,2003,21(3):46―48.Huang Xiang.Research on mechanical behaviors of reinforced concrete frame columns subjected to lateral cyclic loads and regular variable axial loads simultaneously[J].Fujian Architecture and Construction,2003,21(3):46―48.(in Chinese)
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[8]Li K N.Multi-spring model for3-dimensional analysis of RC members[J].Structural Engineering and Mechanics,1993,1(1):17―30.
[9]顾祥林,黄庆华,吴周偲.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.Gu Xianglin,Huang Qinghua,Wu Zhoucai.Analysis of load–displacement relationship for RC columns under reversed load considering accumulative damage[J].Earthquake Engineering and Engineering Vibration,2006,26(4):68―74.(in Chinese)
[10]Lai S S,Will G T,Otani S.Model for inelastic biaxial bending of concrete members[J].Journal of Structural Engineering,1984,110(11):2563―2584.
[11]Lai S S.Post-Yield Hysteretic biaxial models for reinforced concrete members[J].ACI Structural Journal,1987,84(3):235―245.
[12]Li K N.Nonlinear earthquake response of space frame with triaxial interaction[C].Tokyo,Japan:University of Tokyo Press,1993.
[13]Saatcioglu M,Razvi S R.Strength and ductility of confined concrete[J].Journal of Structural Engineering(ASCE),1992,118(6):1590―1607.
[2]杜洪彪.斜向反复周期荷载下钢筋混凝土柱的抗震性能[J].广东工学院学报,1993,10(4):62―70.Du Hongbiao.The seismic behavior of RC column under oblique reversal cyclic loadings[J].Journal of Guangdong Institute of Technology,1993,10(4):62―70.(in Chinese)
[3]杨晓明,丰定国,杨睿.不同加载制度下钢筋混凝土柱抗震性能的试验研究[J].工业建筑,2005,35(9):42―45.Yang Xiaoming,Feng Dingguo,Yang Rui.Experimental study on aseismic performance of RC column under different loading systems[J].Industrial Construction,2005,35(9):42―45.(in Chinese)
[4]黄翔.规则变轴力下钢筋砼框架柱的抗震性能研究[J].福建建筑,2003,21(3):46―48.Huang Xiang.Research on mechanical behaviors of reinforced concrete frame columns subjected to lateral cyclic loads and regular variable axial loads simultaneously[J].Fujian Architecture and Construction,2003,21(3):46―48.(in Chinese)
[5]杨红,白绍良.基于变轴力和定轴力试验对比的钢筋混凝土柱恢复力滞回特性研究[J].工程力学,2003,20(6):58―64.Yang Hong,Bai Shaoliang.The hysteretic behavior of RC columns based on the contrasting tests under constant and varying axial forces[J].Engineering Mechanics,2003,20(6):58―64.(in Chinese)
[6]杨红,白绍良.基于结构弹塑性地震反应的柱变轴力加载方法研究[J].世界地震工程,2002,18(2):80―84.Yang Hong,Bai Shaoliang.A study on the loading method of varying axial force based on the elasto-plastic seismic response of structure[J].World Earthquake Engineering,2002,18(2):80―84.(in Chinese)
[7]Scott M H,Fenves G L.Plastic hinge integration methods for force-based beam-column elements[J].Journal of Structural Engineering,2006,132(2):244―252.
[8]Li K N.Multi-spring model for3-dimensional analysis of RC members[J].Structural Engineering and Mechanics,1993,1(1):17―30.
[9]顾祥林,黄庆华,吴周偲.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.Gu Xianglin,Huang Qinghua,Wu Zhoucai.Analysis of load–displacement relationship for RC columns under reversed load considering accumulative damage[J].Earthquake Engineering and Engineering Vibration,2006,26(4):68―74.(in Chinese)
[10]Lai S S,Will G T,Otani S.Model for inelastic biaxial bending of concrete members[J].Journal of Structural Engineering,1984,110(11):2563―2584.
[11]Lai S S.Post-Yield Hysteretic biaxial models for reinforced concrete members[J].ACI Structural Journal,1987,84(3):235―245.
[12]Li K N.Nonlinear earthquake response of space frame with triaxial interaction[C].Tokyo,Japan:University of Tokyo Press,1993.
[13]Saatcioglu M,Razvi S R.Strength and ductility of confined concrete[J].Journal of Structural Engineering(ASCE),1992,118(6):1590―1607.
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