大尺度RC梁柱节点抗震性能及尺寸效应试验研究
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摘要
基于对一个大尺度RC梁柱节点在低周反复荷载下的加载试验,研究节点的破坏形态、承载能力、滞回特性和耗能能力等抗震性能。并与已有的两个中小尺度梁柱节点的试验数据进行对比,分析尺寸效应对其的影响。结果表明:这些节点都经历了核芯区开裂、梁端屈服、核芯区通裂、剪切极限直至破坏的过程。但是,随着尺寸的增加,节点核芯区斜裂缝的数量明显增多,斜裂缝带中间宽两端细的趋势更加明显。特别在加载后期,大构件节点核芯区的变形和抗剪承载能力下降,刚度衰减加快,耗能能力和延性明显下降。由此看来,在混凝土结构的抗震设计中应该对构件尺寸效应给予更多的注意。
The reversed cyclic loading test of a large-scale beam-column joint is carried out to study its seismic performance,including the load-carrying capacity,failure pattern,hysteretic behaviors,ductility and energy dissipation characteristics,and the results are compared with other relatively smaller specimens for evaluation of the size effect on the seismic performance of structural components.The test results show that the process of joint failure starts from cracking,then yielding developed at beam end,and then the joint becomes fully cracked and finally leads to failure.However the experiments also show that as the size increases,the quantities of inclined cracks significantly increased and the growth rate of diagonal crack to both ends of the joint accelerated.Moreover,for larger specimen the cracking growth tendency of middle-width and ends-narrow in diagonal crack belt becomes more obvious,and the shear capacity and deformation capacity in joint core is obviously decreased.In particular,at the late loading stage,the stiffness decay for the large specimen accelerated,energy dissipation and ductility decreased obviously.The size effect of structural components should be paid more attentions in seismic design of RC structures.
The reversed cyclic loading test of a large-scale beam-column joint is carried out to study its seismic performance,including the load-carrying capacity,failure pattern,hysteretic behaviors,ductility and energy dissipation characteristics,and the results are compared with other relatively smaller specimens for evaluation of the size effect on the seismic performance of structural components.The test results show that the process of joint failure starts from cracking,then yielding developed at beam end,and then the joint becomes fully cracked and finally leads to failure.However the experiments also show that as the size increases,the quantities of inclined cracks significantly increased and the growth rate of diagonal crack to both ends of the joint accelerated.Moreover,for larger specimen the cracking growth tendency of middle-width and ends-narrow in diagonal crack belt becomes more obvious,and the shear capacity and deformation capacity in joint core is obviously decreased.In particular,at the late loading stage,the stiffness decay for the large specimen accelerated,energy dissipation and ductility decreased obviously.The size effect of structural components should be paid more attentions in seismic design of RC structures.
引文
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[16]Zhang N,Tan K H.Size effect in RC deep beams:Experimental investigation and STM verification[J].Engineering Structures,2007,29(12):3241-3254
[2]黄海燕,张子明.混凝土的统计尺寸效应[J].河海大学学报:自然科学版,2004,32(3):291-294(HuangHaiyan,Zhang Ziming.Statistical size effect of concrete[J].Journal of Hohai University:Natural SciencesEdition,2004,32(3):291-294(in Chinese))
[3]杜修力,张建伟,符佳,等.钢筋混凝土构件的尺寸效应研究进展及展望[J].建筑科学与工程学报,2009,26(3):14-19(Du Xiuli,Zhang Jianwei,Fu Jia,et al.Research progress and prospect of size effect on reinforcedconcrete members[J].Journal of Architecture and CivilEngineering,2009,26(3):14-19(in Chinese))
[4]吴寒亮,王元丰.钢管混凝土柱的尺寸效应研究[J].哈尔滨工业大学学报,2007,39(增2):22-25(WuHanliang,Wang Yuanfeng.Study on size effect of concretefilled steel tubular columns[J].Journal of Harbin Instituteof Technology,2007,39(S2):22-25(in Chinese))
[5]刘鸣,邢国华,吴涛,等.基于MCFT理论的RC框架节点受剪性能研究[J].土木工程学报,2011,44(2):82-89(Liu Ming,Xing Guohua,Wu Tao,et al.Shearbehavior of reinforced concrete frame joints using modifiedcompression field theory[J].China Civil EngineeringJournal,2011,44(2):82-89(in Chinese))
[6]Kim J H J,Yi S T,Kim J K.Size effect of concretemembers applied with flexural compressive stresses[J].International Journal of Fracture,2004,126(1):79-102
[7]傅剑平.钢筋混凝土框架节点抗震性能与设计方法研究[D].重庆:重庆大学,2002(Fu Jianping.Seismicbehaviour and design of joints in a reinforced concreteframe[D].Chongqing:Chongqing University,2002(inChinese))
[8]李振宝,郭二伟,周宏宇,等.RC框架节点核芯区剪切破坏——抗震性能试验[J].世界地震工程,2009,25(3):61-66(Li Zhenbao,Guo Erwei,Zhou Hongyu,et al.The seismic behavior of interior beam-column joints of RCframes[J].World Earthquake Engineering,2009,25(3):61-66(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—2002Code for designof concrete structures[S].Beijing:China Architecture&Building Press,2002(in Chinese))
[10]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001(GB50011—2001Code for seismicdesign of buildings[S].Beijing:China Architecture&Building Press,2001(in Chinese))
[11]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003(Guo Zhenhai,Shi Xudong.Reinforced concrete theory and analyse[M].Beijing:Tsinghua University Press,2003(in Chinese))
[12]吕西林,郭子雄,王亚勇.RC框架梁柱组合件抗震性能试验研究[J].建筑结构学报,2001,22(1):2-7(LuXilin,Guo Zixiong,Wang Yayong.Experimental study onseismic behavior of beam-column subassemblages in RCframe[J].Journal of Building Structures,2001,22(1):2-7(in Chinese))
[13]李振宝,王冬雁,郭二伟,等.混合装配无黏结预应力梁试验[J].北京工业大学学报,2008,34(11):1154-1159(Li Zhenbao,Wang Dongyan,Guo Erwei,et al.Experiment of hybrid precast unbonded post-tensionedconcrete beams[J].Journal of Beijing University ofTechnology,2008,34(11):1154-1159(in Chinese))
[14]ACI 318—08 Building code requirements for structuralconcrete and commentary[S].Farmington Hills:American Concrete Institute,2008
[15]Tan K H,Cheng G H.Size effect on shear strength of deepbeams:investigating with strut-and-tie model[J].Journalof Structural Engineering,2006,132(5):673-685
[16]Zhang N,Tan K H.Size effect in RC deep beams:Experimental investigation and STM verification[J].Engineering Structures,2007,29(12):3241-3254
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