高强混凝土加芯柱恢复力特性研究
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摘要
基于6根试验柱在既定轴力下的低周往复加载试验数据、滞回曲线及各阶段的柱顶水平荷载和位移,以峰值荷载点为基准,将试件的骨架曲线拟合为三线段,确定了试件屈服点、极限点与峰值点的关系,根据荷载达峰值时的柱顶水平位移及截面平衡条件推导出了峰值荷载的计算公式;对试验结果进行分析,得到了极限位移、峰值荷载对应位移与核心区纵筋配筋率、核心区面积比及配箍特征值的线性公式;结合试件的滞回规律构建了高强混凝土加芯柱的恢复力模型,并将计算滞回曲线与试验值进行了对比。结果表明:拟合的骨架曲线特征点的计算方法具有较高的精度,构建的恢复力模型与高强混凝土加芯柱的试验滞回曲线吻合较好。
Based on the test results of 6 specimens under constant vertical load but low-cycle horizontal load,including the hysteretic curves,horizontal load values and corresponding displacements at the top of each specimen at each stage of loading,and with the peak load as reference point,their skeleton curves were fitted as idealized tri-linear curves so that the relations between the yield point,points of ultimate displacement and peak load were determined.On the basis of horizontal top displacements at peak load and internal force equilibrium of the cross section,the formula for the calculation of peak loads was derived.From the analysis of test results,a linear relation of ultimate displacement and displacement at peak load with core longitudinal reinforcement ratio,core area and property of tie was obtained.In combination with the hysteretic properties of the specimens,the restoring model of such type of columns was obtained.The research results indicate that this method for the calculation of the characteristic points of fitted tri-linear skeleton curves has high precision,and the constructed restoring force model of high-strength concrete columns with central reinforcement matches well with the hysteric curves from the test.
Based on the test results of 6 specimens under constant vertical load but low-cycle horizontal load,including the hysteretic curves,horizontal load values and corresponding displacements at the top of each specimen at each stage of loading,and with the peak load as reference point,their skeleton curves were fitted as idealized tri-linear curves so that the relations between the yield point,points of ultimate displacement and peak load were determined.On the basis of horizontal top displacements at peak load and internal force equilibrium of the cross section,the formula for the calculation of peak loads was derived.From the analysis of test results,a linear relation of ultimate displacement and displacement at peak load with core longitudinal reinforcement ratio,core area and property of tie was obtained.In combination with the hysteretic properties of the specimens,the restoring model of such type of columns was obtained.The research results indicate that this method for the calculation of the characteristic points of fitted tri-linear skeleton curves has high precision,and the constructed restoring force model of high-strength concrete columns with central reinforcement matches well with the hysteric curves from the test.
引文
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[14]郭子雄,杨勇.恢复力模型研究现状及存在问题[J].世界地震工程,2004,20(4):48-51.GUO Zi-xiong,YANG Yong.State-of-the-art of Re-storing Force Models for RC Structures[J].WorldEarthquake Engineering,2004,20(4):48-51.
[15]张国军,吕西林,刘伯权.轴压比超限时框架柱的恢复力模型研究[J].建筑结构学报,2006,27(1):90-98.ZHANG Guo-jun,LU Xi-lin,LIU Bo-quan.Researchon Restoring Force Models of Frame Columns withUltra-limited Axial Compression Ratio[J].Journal ofBuilding Structures,2006,27(1):90-98.
[16]JGJ101—1996,建筑抗震试验方法规程[S].JGJ 101—1996,Specificating of Testing Methods forEarthquake Resistant Building[S].
[17]PARK R,PAULAY T.Reinforced Concrete Struc-tures[M].New York:John Wiley&Sons,1975.
[2]范重,钱稼茹,吴学敏.核心配筋柱抗震性能试验研究[J].建筑结构学报,2001,22(1):14-19.FAN Zhong,QIAN Jia-ru,WU Xue-min.Experimen-tal Study on Seismic Behavior of Concrete Columnswith Central Reinforcement[J].Journal of BuildingStructures,2001,22(1):14-19.
[3]郭军庆,雷自学,陈鹏郎,等.高轴压比下加芯混凝土框架柱延性与承载力试验研究[J].建筑结构学报,2008,29(4):89-95.GUO Jun-qing,LEI Zi-xue,CHEN Peng-lang,et al.Experimental Study on Ductility and Bearing Capacityof Concrete Frame Columns with Central Reinforce-ment Under High Axial Compression Ratio[J].Jour-nal of Building Structures,2008,29(4):89-95.
[4]TANAKA Y,RO Y,NAKAGAWA O,et al.Strengthe-ning of Reinforced Concrete Columns by Central Rein-forcing Element[C]//IAEE.Proceedings of the Elev-enth World Conference on Earthquake Engineering.Acapulo:IAEE,1996:1-8.
[5]YASHIRO H,TANAKA Y,HIROSE K,et al.Seis-mic Upgrade for Reinforced Concrete Columns byStrengthening the Cross Sectional Center[C]//IAEE.Proceedings of the Twelveth World Conference onEarthquake Engineering.Auckland:IAEE,2000:1-8.
[6]董三升,赵均海.不同配筋形式柱的抗震延性[J].建筑科学与工程学报,2010,27(3):121-126.DONG San-sheng,ZHAO Jun-hai.Seismic Ductilityof Concrete Columns with Different ReinforcementPatterns[J].Journal of Architecture and Civil Engi-neering,2010,27(3):121-126.
[7]GB50010—2010,混凝土结构设计规范[S].GB 50010—2010,Code for Seismic Design of Build-ings[S].
[8]雷自学,董三升,郭军庆,等.高强混凝土加芯柱抗震性能试验研究[J].建筑结构学报,2010,31(12):83-91.LEI Zi-xue,DONG San-sheng,GUO Jun-qing,et al.Test Study on Seismic Performance of High-strengthConcrete Columns with Central Reinforcement[J].Journal of Building Structures,2010,31(12):83-91.
[9]郭子雄,吕西林.高轴压比框架柱恢复力模型试验研究[J].土木工程学报,2004,37(5):32-38.GUO Zi-xiong,LU Xi-lin.Experimental Study on theHysteretic Model of RC Columns with High AxialCompressive Ratio[J].China Civil Engineering Jour-nal,2004,37(5):32-38.
[10]王海生,陈以一,赵宪忠,等.高含钢率钢骨混凝土柱试验和恢复力模型[J].地震工程与工程振动,2010,30(4):57-65.WANG Hai-sheng,CHEN Yi-yi,ZHAO Xian-zhong,et al.Experimental Study on SRC Columns with HighRate of Encased Steel and Their Restoring ForceModel[J].Journal of Earthquake Engineering and En-gineering Vibration,2010,30(4):57-65.
[11]叶列平,丁大钧,程文瀼.高强砼框架柱抗震性能的试验研究[J].建筑结构学报,1992,13(4):41-48.YE Lie-ping,DING Da-jun,CHENG Wen-rang.Ex-perimental Research on Earthquake Resistance Behav-ior of High-strength Concrete Frame Columns[J].Journal of Building Structures,1992,13(4):41-48.
[12]沈聚敏,周锡元,高小旺,等.抗震工程学[M].北京:中国建筑工业出版社,2000.SHEN Ju-min,ZHOU Xi-yuan,GAO Xiao-wang,et al.Earthquake Engineering[M].Beijing:China Ar-chitecture&Building Press,2000.
[13]马恺泽,梁兴文,李斌.方钢管高强混凝土柱恢复力模型研究[J].世界地震工程,2011,27(1):54-59.MA Kai-ze,LIANG Xing-wen,LI Bin.Research onthe Restoring Force Model of High Strength Con-crete-filled Rectangular Steel Tubular Columns[J].World Earthquake Engineering,2011,27(1):54-59.
[14]郭子雄,杨勇.恢复力模型研究现状及存在问题[J].世界地震工程,2004,20(4):48-51.GUO Zi-xiong,YANG Yong.State-of-the-art of Re-storing Force Models for RC Structures[J].WorldEarthquake Engineering,2004,20(4):48-51.
[15]张国军,吕西林,刘伯权.轴压比超限时框架柱的恢复力模型研究[J].建筑结构学报,2006,27(1):90-98.ZHANG Guo-jun,LU Xi-lin,LIU Bo-quan.Researchon Restoring Force Models of Frame Columns withUltra-limited Axial Compression Ratio[J].Journal ofBuilding Structures,2006,27(1):90-98.
[16]JGJ101—1996,建筑抗震试验方法规程[S].JGJ 101—1996,Specificating of Testing Methods forEarthquake Resistant Building[S].
[17]PARK R,PAULAY T.Reinforced Concrete Struc-tures[M].New York:John Wiley&Sons,1975.
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