框架柱塑性铰区基于延性的抗剪承载力研究
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摘要
为防止钢筋混凝土框架柱发生脆性破坏,实现中、强地震作用下所期待的延性破坏,对10个框架中柱构件进行了反复荷载作用下塑性铰形成后的抗剪性能试验研究。从混凝土及箍筋应力水平等条件出发,提出纵筋屈服后框架柱破坏形态的分类标准;研究纵筋屈服后箍筋与混凝土各自的抗剪贡献,回归得出构件在不同位移延性时箍筋及混凝土抗剪贡献的计算公式;以试验为依据研究了框架柱塑性铰区域混凝土抗剪承载力的退化过程及剪切受力机理,对不同延性需求的构件给出不同的抗剪承载力计算公式,弥补我国现行规范未明确剪切抗力与不同延性需求之间定量关系的缺陷。
In order to prevent serious brittle shear failure of reinforced concrete frame columns,and to realize the expected ductile failure under the middle-strong earthquake,an experiment of 10 reinforced concrete frame column specimens for shear capacity is carried out under cyclic load.From the stress levels of concrete and stirrups,the classfication criteria of failure types for frame columns is proposed.The contribution of stirrups and concrete is also studied after the yield of longitudinal reinforcement,and the formulas for the shear contribution of the stirrups and concrete in different displacement ductility are all gained.The degradation process and shear mechanism of concrete shear capacity within the plastic hinge zone are all studied in detail.Based on the ductile design,the formula for the shear capacity of reinforced concrete columns is supposed under the seismic loading to make up the shortcuts of GB50010—2002.
In order to prevent serious brittle shear failure of reinforced concrete frame columns,and to realize the expected ductile failure under the middle-strong earthquake,an experiment of 10 reinforced concrete frame column specimens for shear capacity is carried out under cyclic load.From the stress levels of concrete and stirrups,the classfication criteria of failure types for frame columns is proposed.The contribution of stirrups and concrete is also studied after the yield of longitudinal reinforcement,and the formulas for the shear contribution of the stirrups and concrete in different displacement ductility are all gained.The degradation process and shear mechanism of concrete shear capacity within the plastic hinge zone are all studied in detail.Based on the ductile design,the formula for the shear capacity of reinforced concrete columns is supposed under the seismic loading to make up the shortcuts of GB50010—2002.
引文
[1]Ichinose T.A Shear Design Equation for Ductility R/C Members[J].Earthquake Engineering and Structural Dynamics,1992,21:197-213.
[2]Lee Jung-Yoon,Kim Jin-Young,Oh Gi-jong.Strength Deterioration of Reinforced Concrete Beam-column Joints Subjec-ted to Cyclic Loading[J].Engineering Structures,2009,31:2070-2085.
[3]梁兴文,邓明科,李晓文,等.钢筋混凝土高层建筑结构基于位移的抗震设计方法研究[J].建筑结构,2006,36(7):15-20.
[4]易伟建,李浩.钢筋混凝土柱的“强剪弱弯”可靠性区间分析[J].工程力学,2007,24(9):72-79.
[5]周小真,姜维山.高轴压作用下钢筋混凝土短柱抗震性能研究[J].西安冶金建筑学院学报,1985(2):76-77.
[6]吕西林,路伟东.反复荷载作用下方钢管混凝土柱的抗震性能试验研究[J].建筑结构学报,2000(2):2-11.
[7]傅周灿,郭军庆,王学韵.影响钢筋混凝土框架柱延性的因素分析[J].甘肃科技,2007(6):149-150.
[8]赵国藩.高等钢筋混凝土结构学[M].北京:中国电力出版社,1999.
[9]管品武,陈萌,李险峰,等.地震区混凝土框架柱塑性铰区剪切抗力延性设计试验研究[J].世界地震工程,2005,21(1):150-154.
[10]郭海峰.HRB500钢筋混凝土框架柱塑性铰区抗剪性能试验研究[D].郑州:郑州大学,2009.
[2]Lee Jung-Yoon,Kim Jin-Young,Oh Gi-jong.Strength Deterioration of Reinforced Concrete Beam-column Joints Subjec-ted to Cyclic Loading[J].Engineering Structures,2009,31:2070-2085.
[3]梁兴文,邓明科,李晓文,等.钢筋混凝土高层建筑结构基于位移的抗震设计方法研究[J].建筑结构,2006,36(7):15-20.
[4]易伟建,李浩.钢筋混凝土柱的“强剪弱弯”可靠性区间分析[J].工程力学,2007,24(9):72-79.
[5]周小真,姜维山.高轴压作用下钢筋混凝土短柱抗震性能研究[J].西安冶金建筑学院学报,1985(2):76-77.
[6]吕西林,路伟东.反复荷载作用下方钢管混凝土柱的抗震性能试验研究[J].建筑结构学报,2000(2):2-11.
[7]傅周灿,郭军庆,王学韵.影响钢筋混凝土框架柱延性的因素分析[J].甘肃科技,2007(6):149-150.
[8]赵国藩.高等钢筋混凝土结构学[M].北京:中国电力出版社,1999.
[9]管品武,陈萌,李险峰,等.地震区混凝土框架柱塑性铰区剪切抗力延性设计试验研究[J].世界地震工程,2005,21(1):150-154.
[10]郭海峰.HRB500钢筋混凝土框架柱塑性铰区抗剪性能试验研究[D].郑州:郑州大学,2009.
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