钢筋混凝土Z形截面柱框架节点抗震性能试验研究
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摘要
为了研究钢筋混凝土Z形截面柱框架节点的抗震性能,进行了8榀缩尺比为1∶2的Z形柱中间层节点的低周反复加载试验,得到了节点试件的破坏模式、滞回曲线和骨架曲线,以及受剪承载力和延性系数等用以评价节点抗震性能的主要参数。将试验得到的承载力与规程公式计算结果进行比较,结果表明Z形截面柱节点的承载力可按两个L形截面柱节点的承载力公式计算,计算结果和试验结果吻合较好。分析了轴压比、节点的配箍特征值、剪压比和Z形柱肢高肢厚比等试验参数对节点的抗震性能的影响,分析表明剪压比是Z形截面柱节点延性的最主要影响因素,剪压比小的节点试件具有良好的位移延性和滞回特性,而肢高肢厚比对节点的延性影响不大。
To study the seismic performance of Z-shaped section column joints in RC frame,cyclic loading tests were carried out on eight 1/2-scale interior joints with Z-shaped columns.Failure modes,hysteretic carves and skeleton curves of the joints were obtained,and the main parameters for estimating the earthquake resistant behavior of the joints were also studied,such as shearing capacity and ductility of the joints.The values of the load-bearing capacities of specimens were compared with those calculated from formula present in existing specification.The results show that the shearing capacity of Z-shaped section column joint may be perdicted using the formula of the two L-shaped column joints.The analytical results are in good agreement with experiments.The experiment parameters affecting the seismic behavior of the joints,including the axial compression ratio,the amount of the joint stirrup,shear compression ratio and ratio of pier length to pier thickness were analyzed.It is shown that the ratio of shear compression is the most important factor for the ductility.The smaller shear compression ratio of joints have good displacement ductility and hysteretic behavior.The pier length to pier thickness ratio has a little effect on the ductility.
To study the seismic performance of Z-shaped section column joints in RC frame,cyclic loading tests were carried out on eight 1/2-scale interior joints with Z-shaped columns.Failure modes,hysteretic carves and skeleton curves of the joints were obtained,and the main parameters for estimating the earthquake resistant behavior of the joints were also studied,such as shearing capacity and ductility of the joints.The values of the load-bearing capacities of specimens were compared with those calculated from formula present in existing specification.The results show that the shearing capacity of Z-shaped section column joint may be perdicted using the formula of the two L-shaped column joints.The analytical results are in good agreement with experiments.The experiment parameters affecting the seismic behavior of the joints,including the axial compression ratio,the amount of the joint stirrup,shear compression ratio and ratio of pier length to pier thickness were analyzed.It is shown that the ratio of shear compression is the most important factor for the ductility.The smaller shear compression ratio of joints have good displacement ductility and hysteretic behavior.The pier length to pier thickness ratio has a little effect on the ductility.
引文
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[2]Paulay T.Equilibrium criteria for reinforced concretebeam column joints[J].ACI Structural Journal,1989,86(6):635-643.
[3]傅剑平,张川,陈滔,等.钢筋混凝土抗震框架节点受力机理及轴压比影响的试验研究[J].建筑结构学报,2006,27(3):67-77.(FU Jianping,ZHANGChuan,CHEN Tao,et al.Experimental investigation ofshear mechanism and effect of axial-compression ratioon joins in earthquake-resistant reinforced concreteframes[J].Journal of Building Structures,2006,27(3):67-77.(in Chinese))
[4]傅剑平,张笛川,韦峰,等.异形柱框架中间层端节点抗震性能试验研究[J].建筑结构,2005,35(9):66-72.(Fu Jianping,Zhang Dichuan,Wei Feng,et al.Experimental research of seismic behavior for exteriorjoins with T-shaped cross section column in RC frame[J].Building Structure,2005,35(9):66-72.(inChinese))
[5]Li Bing,Cao Thanh Ngoc Tran.Seismic behavior ofreinforced concrete beam-column joints with verticallydistributed reinforcement[J].ACI Structural Journal,2009,106(6):790-799.
[6]马乐为,陈昌宏,李晓丽.异形柱框架节点抗震性能试验研究[J].世界地震工程,2006,22(4):70-73.(Ma Lewei,Chen Changhong,Li Xiaoli.Experimentalstudies on seismic behavior of special-shaped columnjoints of RC frame[J].Word Earthquake Engineering,2006,22(4):70-73.(in Chinese))
[7]JGJ149—2006混凝土异形柱结构技术规程[S].北京:中国建筑工业出版社,2006.(JGJ149—2006Technical specification for concrete structures withspecially shaped columns[S].Beijing:ChinaArchitecture&Building Press,2006.(in Chinese))
[8]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.(JGJ101—1996Specification of testing methods for earthquake resistantbuilding[S].Beijing:China Architecture&BuildingPress,1997.(in Chinese))
[9]姚振纲,刘祖华.建筑结构试验[M].上海:同济大学出版社,1996:144-150.(Yao Zhengang,LiuZuhua.Test of building structures[M].Shanghai:Tongji University Press,1996:144-150.(in Chinese))
[10]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB50011—2010Codefor seismic design of buildings[S].Beijing:ChinaArchitecture&Building Press,2010.(in Chinese))
[11]GB50152—1992混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.(GB50152—1992Standard methods for testing of concrete structures[S].Beijing:China Architecture&Building Press,1992.(in Chinese))
[12]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.(GB50010—2010Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2011.(inChinese))
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