变轴力下钢筋混凝土柱的抗震性能分析
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摘要
准确预测地震作用下钢筋混凝土(RC)柱的受力特性,对评估混凝土结构的抗震性能具有重要意义。地震作用下,混凝土结构中的RC柱除承受水平荷载外,还由于地震作用引起的倾覆力矩影响承受变轴力作用。因此,往复荷载下RC柱受力及变形特性的研究应该考虑变轴力的影响。首先通过恒轴力和变轴力下RC柱滞回性能的模拟,验证了本研究基于纤维模型程序开发的数值分析模型的准确性。然后,利用该数值模型和分析程序,对一RC柱进行了不同变轴力模式下滞回性能的分析研究。分析结果表明,轴力的变化对RC柱的滞回性能有很大影响。由于非耦合型变轴力变化过程的随机性,为便于变轴力下RC柱的抗震性能分析和试验研究,提出了等代定轴力的概念及其确定方法。
Precise prediction for the hysteretic behaviors of reinforced concrete(RC) column under seismic load is important to assess the aseismic performance of RC structures.Due to the overturning moment in the earthquakes,besides being subjected to seismic lateral forces,RC columns also experience variable axial loads.Therefore the influence of variable axial forces must be taken into account when to study the hysteretic behaviors of RC columns under cyclic loads.A numerical analysis model based on a fiber model program has been validated firstly through the rational hysteretic simulations of two RC columns under various patterns of axial loads,Then a frame column has been simulated under various patterns of variable axial loads by numerical method.The analytical results indicate that the variety of axial loads has considerable effect on the hysteretic behaviors of RC columns.Because of the randomness of axial loads and to facilitate carrying on experimental researches and analyzing earthquakeresistant behaviors of RC structures,a equivalent fixed axial load method is put forward to determine the seismic behaviors of RC columns in structures under earthquake.
Precise prediction for the hysteretic behaviors of reinforced concrete(RC) column under seismic load is important to assess the aseismic performance of RC structures.Due to the overturning moment in the earthquakes,besides being subjected to seismic lateral forces,RC columns also experience variable axial loads.Therefore the influence of variable axial forces must be taken into account when to study the hysteretic behaviors of RC columns under cyclic loads.A numerical analysis model based on a fiber model program has been validated firstly through the rational hysteretic simulations of two RC columns under various patterns of axial loads,Then a frame column has been simulated under various patterns of variable axial loads by numerical method.The analytical results indicate that the variety of axial loads has considerable effect on the hysteretic behaviors of RC columns.Because of the randomness of axial loads and to facilitate carrying on experimental researches and analyzing earthquakeresistant behaviors of RC structures,a equivalent fixed axial load method is put forward to determine the seismic behaviors of RC columns in structures under earthquake.
引文
1 Abrams D P.Influence of Axial Force Variations on Flexural Behaviourof Reinforced Concrete Columns.ACI Structural Journal,1987,84(3):46-54
2 Saadeghvaziri M A.Nonlinear Response and Modeling of RC ColumnsSubjected to Varying Axial Load.Engineering Structures,1997,19(6):417-424
3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.世界地震工程,2002,18(2):80-84
4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.工程力学,2003,20(6):58-64
5 ElMandooh Galal K,Ghobarah A.Flexural and Shear HystereticBehaviour of Reinforced Concrete Columns with Variable Axial Load.Engineering Structures,2003,25:1 353-1 367
6 Esmaeily A,Xiao Y.Behavior of Reinforced Concrete Columns underVariable Axial Loads.ACI Structural Journal,2005,101(1):124-132
7 Esmaeily A,Xiao Y.Behavior of Reinforced Concrete Columns underVariable Axial Loads:Analysis,ACI Structural Journal,2005,102(5):736-744
8陆新征,缪志伟,黄羽立,等.静力和动力荷载作用下混凝土高层结构的倒塌模拟.2005年MSC.Software中国用户年会.成都:2005:1-10
9汪训流,陆新征,叶列平.无粘结预应力混凝土框架的动力分析//城市与工程安全减灾研究与进展.第一届全国学术研讨会论文集.唐山:2006:689-694
10李静.矩形截面FS约束混凝土柱抗震性能的试验研究与理论分析:[博士学位论文].北京:清华大学,2003
11 Légeron F,Paultre P.Uniaxial Confinement Model for Normal and High-Strength Concrete Columns.J Struct Eng,ASCE,2003,129(2):241-252
12江见鲸,陆新征,叶列平.混凝土结构有限元分析.北京:清华大学出版社,2005:51-52
13 Légeron F,Paultre P,Mazar J.Damage Mechanics Modeling ofNonlinear Seismic Behavior of Concrete Structures.J Struct Eng,ASCE,2005,131(6):946-954
2 Saadeghvaziri M A.Nonlinear Response and Modeling of RC ColumnsSubjected to Varying Axial Load.Engineering Structures,1997,19(6):417-424
3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.世界地震工程,2002,18(2):80-84
4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.工程力学,2003,20(6):58-64
5 ElMandooh Galal K,Ghobarah A.Flexural and Shear HystereticBehaviour of Reinforced Concrete Columns with Variable Axial Load.Engineering Structures,2003,25:1 353-1 367
6 Esmaeily A,Xiao Y.Behavior of Reinforced Concrete Columns underVariable Axial Loads.ACI Structural Journal,2005,101(1):124-132
7 Esmaeily A,Xiao Y.Behavior of Reinforced Concrete Columns underVariable Axial Loads:Analysis,ACI Structural Journal,2005,102(5):736-744
8陆新征,缪志伟,黄羽立,等.静力和动力荷载作用下混凝土高层结构的倒塌模拟.2005年MSC.Software中国用户年会.成都:2005:1-10
9汪训流,陆新征,叶列平.无粘结预应力混凝土框架的动力分析//城市与工程安全减灾研究与进展.第一届全国学术研讨会论文集.唐山:2006:689-694
10李静.矩形截面FS约束混凝土柱抗震性能的试验研究与理论分析:[博士学位论文].北京:清华大学,2003
11 Légeron F,Paultre P.Uniaxial Confinement Model for Normal and High-Strength Concrete Columns.J Struct Eng,ASCE,2003,129(2):241-252
12江见鲸,陆新征,叶列平.混凝土结构有限元分析.北京:清华大学出版社,2005:51-52
13 Légeron F,Paultre P,Mazar J.Damage Mechanics Modeling ofNonlinear Seismic Behavior of Concrete Structures.J Struct Eng,ASCE,2005,131(6):946-954
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