型钢混凝土柱的抗震性能影响因素研究
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摘要
采用有限元软件模拟地震作用下型钢混凝土柱(SRC)的受力性能,首先将模拟结果与试验结果进行对比,在确保建立模型正确性的基础上,模拟和分析了单、双轴路径加载下轴压比、配钢形式、加载路径、位移幅值循环次数、变轴力等因素对型钢混凝土柱抗震性能的影响。研究结果表明:截面配钢形式对柱抗震性能有较大影响;大轴压比下柱延性小,耗能差,对抗震不利,且大轴压比双轴路径下柱的抗震性能比单轴路径下更为不利;双轴加载路径下柱峰值强度和延性明显较单轴加载路径下的低,但双轴加载路径下柱的总耗能大于单轴时的总耗能;在轴压比n=0.3的单、双轴加载路径下,位移幅值循环次数对柱骨架曲线的影响不显著,但对耗能有较大影响;在变轴力作用下,柱受力性能表现出明显的不对称性,延性小。
Based on the finite element software,stress performance simulation of SRC columns was carried out under seismic function.Firstly,the simulation results were compared with experimental results to ensure the correctness of the simulation model,then,axial compression ratio,section steel distribution form,loading paths,the cycle number of displacement amplitude,variation of axial force under uniaxial or biaxial loading paths were all considered as analysis parameters to simulate and analyse the seismic performance of SRC columns.The study results showed that section steel distribution forms had significant influence on the seismic performance of columns.Columns with large axial load ratio had small ductility and poor energy dissipation which was adverse to the seismic behavior,and seismic behavior of columns under biaxial loading paths was poorer than uniaxial loading paths.The peak strength and ductility of columns under biaxial loading paths were obviously smaller than those under uniaxial loading paths,but the gross energy dissipation of columns under biaxial loading paths was larger than those under uniaxial loading paths.When the axial compression ratio was 0.3,the impact on skeleton curve of columns of the cycle number of displacement amplitude under uniaxial or biaxial loading paths was not significant,but the impact on energy dissipation of columns was pretty large.The obvious asymmetry of stress performance of columns under variable axial force was demonstrated,and the ductility of columns was small.
Based on the finite element software,stress performance simulation of SRC columns was carried out under seismic function.Firstly,the simulation results were compared with experimental results to ensure the correctness of the simulation model,then,axial compression ratio,section steel distribution form,loading paths,the cycle number of displacement amplitude,variation of axial force under uniaxial or biaxial loading paths were all considered as analysis parameters to simulate and analyse the seismic performance of SRC columns.The study results showed that section steel distribution forms had significant influence on the seismic performance of columns.Columns with large axial load ratio had small ductility and poor energy dissipation which was adverse to the seismic behavior,and seismic behavior of columns under biaxial loading paths was poorer than uniaxial loading paths.The peak strength and ductility of columns under biaxial loading paths were obviously smaller than those under uniaxial loading paths,but the gross energy dissipation of columns under biaxial loading paths was larger than those under uniaxial loading paths.When the axial compression ratio was 0.3,the impact on skeleton curve of columns of the cycle number of displacement amplitude under uniaxial or biaxial loading paths was not significant,but the impact on energy dissipation of columns was pretty large.The obvious asymmetry of stress performance of columns under variable axial force was demonstrated,and the ductility of columns was small.
引文
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[2]王秋维.型钢混凝土柱的受力性能及其结构抗震性能设计研究[D].西安:西安建筑科技大学,2009.
[3]邱法维,李文峰,潘鹏,等.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.
[4]康洪震,江见鲸.不同加载路径下钢筋混凝土框架梁抗震性能的试验研究[J].土木工程学报,2003,36(5):71-75.
[5]李宏男,王强,李兵.钢筋混凝土框架柱多维恢复力特性的试验研究[J].东南大学学报:自然科学版,2002,32(5):728-732.
[6]顾祥林,蔡茂,林峰.地震作用下钢筋混凝土柱受力性能研究[J].工程力学,2010,27(11):160-165.
[7]GB 50010—2010混凝土结构设计规范[S].
[8]李俊华.低周反复荷载下型钢高强混凝土柱受力性能试验研究[D].西安:西安建筑科技大学,2005.
[9]徐绩青.延性系数确定方法的探讨[J].水运工程,2004(9):14-17.
[10]丁焕龙,郝际平,姜维山.双向偏心受压型钢混凝土柱有限元分析[J].工业建筑,2010,40(S1):409-412.
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