单向和双向加载下空间夹心节点抗震性能试验研究
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摘要
通过单向和双向两种加载方式下空间夹心节点(即核心区采用同梁等强的低强度混凝土浇筑的节点)的低周往复荷载试验,研究了不同加载方式对夹心节点的破坏形式、破坏程度、延性、耗能、刚度退化的影响。结果表明:单向和双向加载方式下,夹心节点的破坏形式以梁纵筋屈服后节点核心区的破坏为主,但双向加载方式下节点的破坏程度更为严重,且延性有所降低;双向荷载的耦合作用降低了节点的抗剪承载力,在设计中仅考虑单方向地震作用是不安全的;两种加载方式对节点耗能性能和刚度退化的影响不明显。
3D sandwich joints cast core area with weaker strength concrete of beam are tested under unidirectional or bi-directional reversed cyclic loads, the seismic performances, including the failure mode, damage, ductility, energy dissipation, rigidity degeneration are studied. The test results show that: under unidirectional or bi-directional loads,sandwich node damage form is mainly the shear destruction after the beam longitudinal reinforcement yield,but the node damage of bidirectional loading mode is more serious,and the ductility decreases; two-way coupling effect of the load reduces the shear bearing capacity of node,single direction seismic action considered in the design is not safe; the effect of loading modes on the performance of node energy dissipation and stiffness degradation is not obvious.
3D sandwich joints cast core area with weaker strength concrete of beam are tested under unidirectional or bi-directional reversed cyclic loads, the seismic performances, including the failure mode, damage, ductility, energy dissipation, rigidity degeneration are studied. The test results show that: under unidirectional or bi-directional loads,sandwich node damage form is mainly the shear destruction after the beam longitudinal reinforcement yield,but the node damage of bidirectional loading mode is more serious,and the ductility decreases; two-way coupling effect of the load reduces the shear bearing capacity of node,single direction seismic action considered in the design is not safe; the effect of loading modes on the performance of node energy dissipation and stiffness degradation is not obvious.
引文
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[10]闫维明,侯立群,陈适才,等.双向荷载作用下空间夹心节点受力性能试验研究[J].工程力学,2016,(5):211~219Yan Wei-ming,Hou Li-qun,Chen Shi-cai,et al.Experimental Study on the Mechanical Behavior of 3d Sandwich Joints Under Bi-directional Loading[J].Engineering Mechanics,2016,(5):211~219(in Chinese)
[11]GB50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[12]JGJ/T 101-2015,《建筑抗震试验规程》[S]JGJ/T 101-2015,Specification for Seismic Test of Buildings.[S](in Chinese)
[13]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989Tang Jiu-ru.Seismic Resistance of Joints in Reinforced Concrete Frames[M].Nanjing:Southeast University Press,1989(in Chinese)
[2]Abdel Wahab E A W.Transmission of Column Loads through Lower Strength Concrete Floors Experimental and Analytical Study[D].Edmonton:University of Alberta,2005
[3]Lee J H,Yoon Y S.Prediction of Effective CompressiveStrength of Corner Columns Composing Weaker Slabcolumn Joint[J].Magazine of Concrete Research,2012,64(12):1113~1121
[4]Pantazopoulou S J,French C W.Slab Participation in Practical Earthquake Design of Reinforced Concrete Frames[J].ACI Structural Journal,2001,98(4):479~489
[5]林旭川,潘鹏,叶列平,等.汶川地震中典型RC框架结构的震害仿真与分析[J].土木工程学报,2009,(5):13~20Lin Xu-chuan,Pan Peng,Ye Lie-ping,et al.Analysis of the Damage Mechanism of a Typical RC Frame in Wenchuan Earthquake[J].China Civil Engineering Journal,2009,(5):13~20(in Chinese)
[6]Lei Y,Li Q,Chen F,et al.Damage Identification of Frame Structures with Joint Damage under Earthquake Excitation[J].Advances in Structural Engineering,2014,17(8):1075~1087
[7]薛伟辰,姜东升,陈以一,等.预应力混凝土空间节点抗震性能试验研究[J].建筑结构学报,2007,(1):43~51Xue Wei-chen,Jiang Dong-sheng,Chen Yi-yi,et al.Experimental Study on Seismic Performance of Prestressed Concrete Spatial Joints[J].Journal of Building Structures,2007,(1):43~51(in Chinese)
[8]李振宝,刘春阳,马华.45°方向地震作用下RC空间梁柱节点破坏机制研究[J].北京工业大学学报,2011,(7):1005~1011Li Zhen-bao,Liu Chun-yang,Ma Hua,et al.Damage Mechanism Research on Reinforced Concrete Spatial Joints Subjected to 45~degree Direction Cyclic Loading[J].Journal of Beijing University of Technology,2011,(7):1005~1011(in Chinese)
[9]崔建宇,车轶,孙建刚,等.高层钢筋混凝土框架底层角节点抗震性能[J].重庆大学学报,2014,(2):98~105Cui Jian-yu,Che Yi,Sun Jian-gang,et al.Seismic Performance of First Floor Corner Joints of High-rise Reinforced Concrete Frame Structure[J].Journal of Chongqing University,2014,(2):98~105(in Chinese)
[10]闫维明,侯立群,陈适才,等.双向荷载作用下空间夹心节点受力性能试验研究[J].工程力学,2016,(5):211~219Yan Wei-ming,Hou Li-qun,Chen Shi-cai,et al.Experimental Study on the Mechanical Behavior of 3d Sandwich Joints Under Bi-directional Loading[J].Engineering Mechanics,2016,(5):211~219(in Chinese)
[11]GB50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[12]JGJ/T 101-2015,《建筑抗震试验规程》[S]JGJ/T 101-2015,Specification for Seismic Test of Buildings.[S](in Chinese)
[13]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989Tang Jiu-ru.Seismic Resistance of Joints in Reinforced Concrete Frames[M].Nanjing:Southeast University Press,1989(in Chinese)