连梁内设置竖向变形阻尼器的耗能剪力墙体系减震分析与设计
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摘要
将钢筋混凝土联肢剪力墙在连梁跨中开缝,在缝中设置沿竖向变形的钢阻尼器,从而形成耗能联肢剪力墙体系。在强震作用下,耗能剪力墙中的阻尼器一方面适当削弱联肢剪力墙刚度以降低地震作用,另一方面阻尼器屈服后可耗散部分地震能量,从而减小墙肢及连梁的塑性损伤。将阻尼器与连梁组合为等效连梁,运用等效连续化方法对耗能剪力墙体系的刚度特性与阻尼特性进行了简化分析,对耗能剪力墙体系的减震机理进行了论证,并推导出体系关键参数的计算式。以阻尼器延性系数和联肢墙耦合比为设计控制指标,提出了该耗能剪力墙体系基于性能/需求的设计方法。设计实例表明:所提出设计方法简便可行;在参数设计合理的情况下,建议的耗能剪力墙体系具备良好的减震效果。
It is suggested that the coupled reinforced concrete shear wall should be disconnected at the middle of coupling beams and then steel dampers would be set vertically in the slits to couple the disconnected wall piers,resulting in a damping controlled shear wall system.The steel dampers weaken the wall in stiffness,enhance the capacity of energy dissipation during strong earthquakes,and then reduce the earthquake action and avoid severe structural damage.Regarding the damper and the coupling beam together as an equivalent coupling beam,both the damping and stiffness properties of the damping controlled system can be analyzed simply by continuous medium method.The damping control mechanism of the system was investigated and the formulas for calculating key parameters were derived simultaneously.According to the analysis results,a simplified performance/demand-based design method which adopts the damper ductility factor and coupling ratio as the governing factors was proposed for the convenience of practical application of the proposed damped wall.The design procedure was prescribed and discussed in detail and verified by a simple design example.Nonlinear dynamic analysis of the designed damping controlled wall indicates that with a proper set of damping parameters,the wall's dynamic responses can be well controlled compared with the conventional wall.
It is suggested that the coupled reinforced concrete shear wall should be disconnected at the middle of coupling beams and then steel dampers would be set vertically in the slits to couple the disconnected wall piers,resulting in a damping controlled shear wall system.The steel dampers weaken the wall in stiffness,enhance the capacity of energy dissipation during strong earthquakes,and then reduce the earthquake action and avoid severe structural damage.Regarding the damper and the coupling beam together as an equivalent coupling beam,both the damping and stiffness properties of the damping controlled system can be analyzed simply by continuous medium method.The damping control mechanism of the system was investigated and the formulas for calculating key parameters were derived simultaneously.According to the analysis results,a simplified performance/demand-based design method which adopts the damper ductility factor and coupling ratio as the governing factors was proposed for the convenience of practical application of the proposed damped wall.The design procedure was prescribed and discussed in detail and verified by a simple design example.Nonlinear dynamic analysis of the designed damping controlled wall indicates that with a proper set of damping parameters,the wall's dynamic responses can be well controlled compared with the conventional wall.
引文
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[7]Priestley M J N,Calvi G M,Kowalsky M J.Displacement-based seismic design of structures[M].Pavia,Italy:Iuss Press,2007:372-386.
[8]Harries K,Moulton J,Clemson R.Parametric study ofcoupled wall behavior:implications for the design ofcoupling beams[J].Journal of Structural Engineering,2004,130(3):480-488.
[9]Chaallal O,Nollet M J.Upgrading the degree ofcoupling of coupled shear walls[J].Canadian Journalof Civil Engineering,1997,24(6):986-995.
[10]Rosman R.Approximate analysis of shear walls subjectto lateral loads[J].Journal Proceedings,ACI,1964,61(6):717-734.
[11]Heidebrecht A C,Smith B S.Approximate analysis oftall wall-frame structures[J].Journal of the StructuralDivision,1973,99(2):199-221.
[12]Berton S,Bolander J.Amplification system forsupplemental damping devices in seismic applications[J].Journal of Structural Engineering,ASCE,2005,131(6):979-983.
[13]Lin Y Y,Tsai M H,Hwang J S,et al.Directdisplacement-based design for building with passiveenergy dissipation systems[J].Engineering Structures,2003,25(1):25-37.
[14]Harries K A.Ductility and deformability of couplingbeams in reinforced concrete coupled walls[J].Earthquake Spectra,2001,17(3):457-478.
[15]El-Tawil S,Harries K,Fortney P,et al.Seismicdesign of hybrid coupled wall systems:state of the art[J].Journal of Structural Engineering,ASCE,2010,136(7):755-769.
[2]李爱群,丁大钧,曹征良.带摩阻控制装置双肢剪力墙模型的振动台试验研究[J].工程力学,1995,12(3):70-76.(Li Aiqun,Ding Dajun,Cao Zhengliang.Experimental study on shaking table model of coupledshear wall with friction damp control devices[J].Engineering Mechanics,1995,12(3):70-76.(inChinese))
[3]Chung H,Moon B,Lee S,et al.Seismic performanceof friction dampers using flexure of RC shear wallsystem[J].The Structural Design of Tall and SpecialBuildings,2009,18(7):807-822.
[4]滕军,马伯涛,李卫华,等.联肢剪力墙连梁阻尼器地震模拟试验研究[J].建筑结构学报,2010,31(12):101-107.(TENG Jun,MA Botao,LI Weihua,et al.Seismic simulation test for coupling beam damperof coupled shear wall structure[J].Journal of BuildingStructures,2010,31(12):101-107.(in Chinese))
[5]Zhao Q,Astaneh-Asl A.Cyclic behavior of traditionaland innovative composite shear walls[J].Journal ofStructural Engineering,2004,130(2):271-284.
[6]潘超,翁大根.耗能剪力墙结构体系研究进展[J].结构工程师,2011,27(2):160-168.(Pan Chao,Weng Dagen.State-of-the-art of shear wall systems withenergy dissipation mechanism[J].StructuralEngineers,2011,27(2):160-168.(in Chinese))
[7]Priestley M J N,Calvi G M,Kowalsky M J.Displacement-based seismic design of structures[M].Pavia,Italy:Iuss Press,2007:372-386.
[8]Harries K,Moulton J,Clemson R.Parametric study ofcoupled wall behavior:implications for the design ofcoupling beams[J].Journal of Structural Engineering,2004,130(3):480-488.
[9]Chaallal O,Nollet M J.Upgrading the degree ofcoupling of coupled shear walls[J].Canadian Journalof Civil Engineering,1997,24(6):986-995.
[10]Rosman R.Approximate analysis of shear walls subjectto lateral loads[J].Journal Proceedings,ACI,1964,61(6):717-734.
[11]Heidebrecht A C,Smith B S.Approximate analysis oftall wall-frame structures[J].Journal of the StructuralDivision,1973,99(2):199-221.
[12]Berton S,Bolander J.Amplification system forsupplemental damping devices in seismic applications[J].Journal of Structural Engineering,ASCE,2005,131(6):979-983.
[13]Lin Y Y,Tsai M H,Hwang J S,et al.Directdisplacement-based design for building with passiveenergy dissipation systems[J].Engineering Structures,2003,25(1):25-37.
[14]Harries K A.Ductility and deformability of couplingbeams in reinforced concrete coupled walls[J].Earthquake Spectra,2001,17(3):457-478.
[15]El-Tawil S,Harries K,Fortney P,et al.Seismicdesign of hybrid coupled wall systems:state of the art[J].Journal of Structural Engineering,ASCE,2010,136(7):755-769.
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