斜向水平荷载作用下双向不等肢配箍框架柱受剪性能试验研究
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摘要
通过三根不等肢配箍矩形框架柱在斜向低周水平反复荷载作用下的模型试验,结合以往试验数据,从滞回性能、刚度退化、延展性、耗能能力等方面对不等肢配箍矩形框架柱的抗震性能进行分析。分析表明:剪切破坏不等肢配箍矩形框架柱较差;刚度在加荷初期退化不明显,随着斜裂缝出现和位移的增加,刚度退化程度加大;延性系数和极限转角均随加载角度的增大而增大。在0o加载角时,构件的耗能能力最强,当加载角度为15o和75o时构件的耗能能力相差不大。
Three RC frame columns are tested under two-way horizontal cyclic loads. Based on the testing results, as well as those of previous experiments, the seismic behaviors of RC frame columns with different amount of stirrups are researched in this paper. The hysteretic behavior, rigidity degeneration, ductibility and capability of energy dissipation are analyzed by loading the structures in two principal directions. Experimental results show that the hysteretic behavior is poor and the rigidity degeneration is not significant during the early loading stage but turns out to be significant after cracks occur. Results also indicate that the ductility factor and the ultimate rotation angle of the columns increase with the increasing of load angle. Moreover, the capability of energy dissipation is maximized in the case of 0o load angle, and the variation is small if the load angle varies between 15o and 75o.
Three RC frame columns are tested under two-way horizontal cyclic loads. Based on the testing results, as well as those of previous experiments, the seismic behaviors of RC frame columns with different amount of stirrups are researched in this paper. The hysteretic behavior, rigidity degeneration, ductibility and capability of energy dissipation are analyzed by loading the structures in two principal directions. Experimental results show that the hysteretic behavior is poor and the rigidity degeneration is not significant during the early loading stage but turns out to be significant after cracks occur. Results also indicate that the ductility factor and the ultimate rotation angle of the columns increase with the increasing of load angle. Moreover, the capability of energy dissipation is maximized in the case of 0o load angle, and the variation is small if the load angle varies between 15o and 75o.
引文
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[2]Woodward K A,Jirsa J O,Asce M.Influence of reinforcement on RC short column lateral resistance[J].Journal of Structural Engineering,1984,l10(1):90―104.
[3]Maruyama Kyuichi,Ramirez Horacio,Jirsa J O.Short RC columns under bilateral load histories[J].Journal of Structrural Engineering,1984,110(1):121―137.
[4]Umehara Hidetaka,Jirsa J O.Short rectangular RC columns under bilateral loading[J].Journal of Structural Engineering,1984,110(3):605―618.
[5]郭永亮.斜向水平荷载作用下两向不等肢配箍钢筋混凝土框架柱抗剪试验研究[D].天津:天津大学,2004.Guo Yongliang.Shear strength of column with diferent stirrups amounts in two principal directions under skewed horizontal loads[D].Tianjin:Tianjin University,2004.(in Chinese)
[6]徐明贵.矩形截面钢筋混凝土框架柱双向受剪试验研究[D].天津:天津大学,2003.Xu Minggui.Test research of rectangular RC frame columns under bilateral loads[D].Tianjin:Tianjin University,2003.(in Chinese)
[7]王铁成,陈恒超.反复荷载作用下双向受剪框架柱的刚度退化[J].天津大学学报,2005,38(12):1058―1062.Wang Tiecheng,Chen Hengchao.Rigidity degeneration of RC column under Two-Way horizontal cyclic loads[J].Journal of Tianjin University,2005,38(12):1058―1062.(in Chinese)
[8]王铁成.混凝土结构原理[M].天津:天津大学出版社,2002.Wang Tiecheng.Principles of Reinforcd Concrete structures[M].Tianjin:Tianjin University Press,2002.(in Chinese)
[9]GB50010-2002,混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.GB50010-2002,Code for design of concrete structures[S].Beijing:China Architectural Industry Press,2002.(in Chinese)
[10]戎贤,王铁成,康谷贻.钢筋混凝土框架柱双向受剪承载力分析[J].地震工程与工程振动,2002,22(5):46―52.Rong Xian,Wang Tiecheng,Kang Guyi.Study on two-way shear strength of columns in RC frames[J].Earthquake Engineering and Engineering Vibration,2002,22(5):46―52.(in Chinese)
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