半刚接钢框架内填RC墙结构滞回性能试验——整体性能分析
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摘要
半刚接钢框架内填钢筋混凝土剪力墙结构(简称PSRCW)在低周反复荷载作用下抗剪栓钉易发生疲劳断裂,从而使结构后期承载力衰减过快,延性较差。为了进一步改善结构的延性性能,采用槽钢、U形钢筋及抗剪栓钉三种不同形式的抗剪连接件,通过3榀1/3缩尺、两层、单跨PSRCW试件的低周反复荷载试验,重点研究抗剪连接件对结构性能的影响,分析结构的传力机理、破坏模式、滞回性能、刚度退化、变形及延性、耗能能力等。试验结果表明:加载过程中,抗剪连接件未发生疲劳断裂,试件的后期承载力退化缓慢,试件的变形能力、延性性能以及耗能能力均得到大幅提高,试件呈内填墙压碎的延性破坏模式。抗剪连接件的抗剪能力应与混凝土内填墙的抗剪能力相协调,内填墙混凝土强度等级不宜过高,避免抗剪连接件的破坏模式由剪断控制。PSRCW结构中抗剪连接件不发生疲劳断裂是结构发生延性破坏的重要前提。
Low cyclic fatigue of the shear connectors of partially-restrained steel frame with RC infill walls(PSRCW)is typical,and usually leads to rapid post-peak strength degradation and poor ductility.In order to improve the ductility of PSRCW,three types of shear connectors,including channel steel,U-shaped bar and stud,were employed in this study.Low cyclic loading test on three 1/3 sccale one-bay,two-story test specimens were carried out and the effects of shear connectors on the structural performance was studied.The force transfer mechanism,failure mode,hysteretic behavior,stiffness degradation,deformation and ductility,and energy dissipation were discussed.Test results reveal that wall crushing was the main failure pattern and the failure mode was ductile.Low cyclic fatigue of shear connectors did not occur,and the performance of the specimens,including post-peak strength degradation,ductility behavior,deformation capacity,and energy dissipation,was significantly improved.In order to avoid fracturing of shear connectors,it is critical to select suitable strength grade for the infill wall concrete to ensure that the shear capability of shear connectors is consistent with shear capacity of the infill walls.Avoiding the fatigue failure of shear connectors is crucial to ensure the ductile failure mode of PSRCW.
Low cyclic fatigue of the shear connectors of partially-restrained steel frame with RC infill walls(PSRCW)is typical,and usually leads to rapid post-peak strength degradation and poor ductility.In order to improve the ductility of PSRCW,three types of shear connectors,including channel steel,U-shaped bar and stud,were employed in this study.Low cyclic loading test on three 1/3 sccale one-bay,two-story test specimens were carried out and the effects of shear connectors on the structural performance was studied.The force transfer mechanism,failure mode,hysteretic behavior,stiffness degradation,deformation and ductility,and energy dissipation were discussed.Test results reveal that wall crushing was the main failure pattern and the failure mode was ductile.Low cyclic fatigue of shear connectors did not occur,and the performance of the specimens,including post-peak strength degradation,ductility behavior,deformation capacity,and energy dissipation,was significantly improved.In order to avoid fracturing of shear connectors,it is critical to select suitable strength grade for the infill wall concrete to ensure that the shear capability of shear connectors is consistent with shear capacity of the infill walls.Avoiding the fatigue failure of shear connectors is crucial to ensure the ductile failure mode of PSRCW.
引文
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[3]方有珍,顾强,申林.半刚接钢框架(柱弱轴)-内填剪力墙结构滞回性能试验研究[J].建筑结构学报,2008,29(2):51-62(Fang Youzhen,Gu Qiang,Shen Lin.Hystereticbehavior of simi-rigid composite steel frame with reinforcedconcrete infill wall in column weak axis[J].Journal ofBuilding Structures,2008,29(2):51-62(in Chinese))
[4]颜鹏.刚性连接钢框架内填钢筋混凝土剪力墙结构体系的滞回性能及抗震设计对策[D].西安:西安建筑科技大学,2006(Yan Peng.Hysteretic behavior and designcriterion of composite steel frame-reinforced concrete infillwall structural system with fr connections[D].Xi′an:Xi′an University of Architecture and Technology,2006(inChinese))
[5]Liauw T C,Kwan K H.Plastic theory of non-integralinfilled frames[J].Proceedings of the Institution of CivilEngineers,1983,75(2):379-396
[6]Liauw T C,Kwan K H.Plastic theory of infilled frameswith finite interface shear strength[J].Proceedings of theInstitution of Civil Engineers,1983,75(2):707-723
[7]JGJ 101—96建筑抗震试验方法规程[S].(JGJ 101—96Specification of testing methods for earthquake resistantbuilding[S](in Chinese))
[8]GB 50011—2001建筑抗震设计规范[S].(GB 50011—2001 Code for seismic design of buildings[S](inChinese))
[9]CECS 160:2004建筑工程抗震性态设计通则(试用)[S].(CECS160:2004 General rule for performance-basedseismic design of buildings[S](in Chinese))
[10]李少泉,沙镇平.钢筋混凝土多高层建筑结构在地震作用下的割线刚度分析法[J].土木工程学报,2003,36(8):37-42(Li Shaoquan,Sha Zhenping.Secantstiffness analysis method of RC high-rise buildingstructures under seismic actions[J].China CivilEngineering Journal,2003,36(8):37-42(in Chinese))
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