钢筋混凝土不等肢异形柱抗剪承载力研究
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摘要
根据9根钢筋混凝土不等肢异形柱在低周反复荷载作用下抗剪性能试验研究,分析了翼缘尺寸对异形柱抗剪承载力的影响。采用桁架-拱模型理论对异形柱的受力进行了分析。结果表明:异形柱的剪力分别由桁架机构和拱机构承担,由于翼缘部分参与抗剪作用,可以提高异形柱的抗剪承载力。基于桁架-拱模型,推导出考虑翼缘影响的异形柱抗剪承载力计算公式,通过与试验数据的比较发现,两者吻合较好。
Nine specially shaped reinforced concrete(RC) columns with different limb lengths were tested under low reversed cyclic loadings.The influence of the flange on the shear resistance of specially shaped RC columns was studied.The truss-arch model is also used to study the stress of specially shaped columns at their ultimate shear limit state.The results show that the shear resistance is composed of two parts contributed by a truss model and an arch model,and the flange can promote the shear bearing capacity of specially shaped columns for it participates in the truss-arch action.At last,a formula based on the truss-arch model is presented to calculate the shear resistance of specially shaped RC columns by considering the flange.The calculated values are in good agreement with the experimental results.
Nine specially shaped reinforced concrete(RC) columns with different limb lengths were tested under low reversed cyclic loadings.The influence of the flange on the shear resistance of specially shaped RC columns was studied.The truss-arch model is also used to study the stress of specially shaped columns at their ultimate shear limit state.The results show that the shear resistance is composed of two parts contributed by a truss model and an arch model,and the flange can promote the shear bearing capacity of specially shaped columns for it participates in the truss-arch action.At last,a formula based on the truss-arch model is presented to calculate the shear resistance of specially shaped RC columns by considering the flange.The calculated values are in good agreement with the experimental results.
引文
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[10]Priestley M J N,Ravindra Verma,Yan Xiao.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1993,120(8):2310-2329.
[11]贾平一,李延涛,王立军.基于桁架拱模型的抗剪承载力计算方法[J].河北建筑工程学院学报,2001,19(1):7―9.Jia Pingyi,Li Yantao,Wang Lijun.Calculation methods of shear strength on truss-arch model[J].Journal of Hebei Institute of Architectural Engineering,2001,19(1):7―9.(in Chinese)
[12]赵树红,叶列平.基于桁架-拱模型理论对碳纤维布加固混凝土柱受剪承载力的分析[J].工程力学,2001,18(6):134-140.Zhao Shuhong,Ye Lieping.Shear strength analysis of concrete column retrofitted with CFRP sheet based on strut-arch model[J].Engineering Mechanics,2001,18(6):134―140.(in Chinese)
[2]康谷贻,巩长江.单调及低周反复荷载作用下异形截面框架柱的受剪性能[J].建筑结构学报,1997,18(5):22―31.Kang Guyi,Gong Changjiang.Shear properties of T and L-shaped section frame columns under monotonic and horizontal low cyclic loadings[J].Journal of Building Structures,1997,18(5):22―31.(in Chinese)
[3]徐向东,康谷贻,姚石良.单周及低周反复荷载作用下T形截面框架柱受剪性能的试验研究[J].建筑结构,1999,29(1):27-30.Xu Xiangdong,Kang Guyi,Yao Shiliang.Experimental study on shear behavior of T-shaped section RC frame columns[J].Building Structures,1999,29(1):27―30.(in Chinese)
[4]李杰,吴建营,周德源,聂礼鹏.L形和Z形宽肢异形柱低周反复荷载试验研究[J].建筑结构学报,2002,23(1):9―15.Li Jie,Wu Jianying,Zhou Deyuan,Nie Lipeng.Experimental research on wide flange specially shaped section columns subjected to cyclic loading[J].Journal of Building Structures,2002,23(1):9―15.(in Chinese)
[5]Watson S,Zahn F A,Park R.Confining reinforcement for concrete columns[J].Journal of Structural Engineering,1994,120(6):1798―1824.
[6]Park R.Capacity design of ductile RC building structures for earthquake resistance[J].Structural Engineering,1992,70(16):279―289.
[7]Ang Beng Ghee,Priestley M J N,Pauly T.Seismic shear strength of circular reinforced concrete[J].Journal of Structural Engineering,1994,120(8):2310―2329.
[8]Martin Perez B,Pantazopoulou S J.Mechanics of concrete participation in cyclic shear resistance of RC[J].Journal of Structural Engineering,1998,124(6):633―641.
[9]管品武,徐泽晶,王博.钢筋混凝土构件抗剪承载力分析方法比较[J].世界地震工程,2002,18(3):95―101.Guan Pinwu,Xu Zejing,Wang Bo.Shear capacity analysis methods on RC members[J].World Earthquake Engineering,2002,18(3):95―101.(in Chinese)
[10]Priestley M J N,Ravindra Verma,Yan Xiao.Seismic shear strength of reinforced concrete columns[J].Journal of Structural Engineering,1993,120(8):2310-2329.
[11]贾平一,李延涛,王立军.基于桁架拱模型的抗剪承载力计算方法[J].河北建筑工程学院学报,2001,19(1):7―9.Jia Pingyi,Li Yantao,Wang Lijun.Calculation methods of shear strength on truss-arch model[J].Journal of Hebei Institute of Architectural Engineering,2001,19(1):7―9.(in Chinese)
[12]赵树红,叶列平.基于桁架-拱模型理论对碳纤维布加固混凝土柱受剪承载力的分析[J].工程力学,2001,18(6):134-140.Zhao Shuhong,Ye Lieping.Shear strength analysis of concrete column retrofitted with CFRP sheet based on strut-arch model[J].Engineering Mechanics,2001,18(6):134―140.(in Chinese)
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