近场地震作用下直接基于位移设计的消能减震结构分析
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摘要
液体黏滞阻尼器因其良好的减震效果和经济性,目前广泛应用于高层建筑结构以抵御地震作用。建筑抗震规范对加设黏滞阻尼器的高层建筑结构设计做了相应的规定;直接基于位移设计也被应用于减震结构设计。然而近场地震动作用由于具有破裂向前效应和滑冲效应等特点,对高层建筑结构造成的破坏远强于远场的地震动。本文直接基于位移设计方法,对考虑近场地震作用效应的高层建筑结构进行消能减震分析。介绍了设计原理及流程,并对一典型高层建筑结构进行黏滞阻尼器消能减震设计。采用三条地震动进行动力分析,基于层间位移角、楼层加速度反应谱和结构能量耗散等指标对减震控制效果进行评价。
Fluid viscous dampers are widely used in high-rise buildings for their good seismic reduction effect and economy. The corresponding provisions for seismic design of high-rise buildings with viscous dampers have been included in Code for Seismic Design of Buildings. The direct displacement based design( DDBD) is also applied to the design of the seismic reduction structures. However,due to the forward-directivity rupture effect and the fling-step effect,the damage caused by near-fault ground motions is more serious than that of far-fault ground motions. The seismic response of high-rise buildings based on the direct displacement-based design method is investigated while takingthese effects of near-fault ground motions into consideration. The design principle and flow chart are introduced,and the energy dissipation design of a typical tall building with viscous dampers is presented. Inter-story drift ratios,floor acceleration response spectrum and structural energy are used to assess the performance of buildings under three ground motions.
Fluid viscous dampers are widely used in high-rise buildings for their good seismic reduction effect and economy. The corresponding provisions for seismic design of high-rise buildings with viscous dampers have been included in Code for Seismic Design of Buildings. The direct displacement based design( DDBD) is also applied to the design of the seismic reduction structures. However,due to the forward-directivity rupture effect and the fling-step effect,the damage caused by near-fault ground motions is more serious than that of far-fault ground motions. The seismic response of high-rise buildings based on the direct displacement-based design method is investigated while takingthese effects of near-fault ground motions into consideration. The design principle and flow chart are introduced,and the energy dissipation design of a typical tall building with viscous dampers is presented. Inter-story drift ratios,floor acceleration response spectrum and structural energy are used to assess the performance of buildings under three ground motions.
引文
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[7]李钢,李宏男.基于位移的消能减震结构抗震设计方法[J].工程力学,2007,24(9):88-94Li Gang, Li Hong-nan. Direct displacement-based design for buildings withpassive energy dissipation devices[J].Engineering Mechanics,2007,24(9):88-94(in Chinese)
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[10] GB 50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for seismic design of buildings[S](in Chinese)
[11]江义,杨迪雄,李刚.近断层地震动向前方向性效应和滑冲效应对高层钢结构地震反应的影响[J].建筑结构学报,2010,31(9):103-110Jiang Yi,Yang Di-xiong,Li Gang. Effects of forward directivity and fling step of near-fault ground motions on seismic responses of high-rise steel structure[J].Journal of Building Structures,2010,31(9):103-110(in Chinese)
[2] Nadine M. Seismic design,damper studded diamonds[J]. Engineering News Record,2003,6,34-38
[3] Infanti S,Robinson J,Smith R. Viscous dampers for high-rise buildings[A]. Proceedings of the The 14th World Conference on Earthquake Engineering[C].2008,Beijing:China
[4]韩建平,陈军,邹新磊.基于性能的非线性黏滞阻尼器减震结构设计与抗倒塌能力评估[J].建筑结构,2014,44(4):63-65Han Jian-ping,Chen Jun,Zou Xin-lei. Performancebased seismic design and collapse resistance capacity evaluation for energy dissipation structures with nonlinear viscous dampers[J]. Building Structure,2014,44(4):63-65(in Chinese)
[5]韩建平,李晓松.基于性能的非线性黏滞阻尼器减震结构设计分析[J].建筑结构,2010,40(增2):110-113Han Jian-ping, Li Xiao-song. Performance-based seismic design and analysis for energy-dissipated structures with non-linear viscous dampers[J]. Building Structure,2010,40(s2):110-113(in Chinese)
[6]韩建平,阎茹,李慧.基于性能的黏弹性阻尼器减震结构抗震设计[J].地震工程与工程振动,2008,28(1):175-81Han Jian-ping,Yan Ru,Li Hui. Performance-based seismic design for structures with viscoelastic dampers[J]. Earthquake Engineering and Engineering Vibration,2008,28(1):175-181(in Chinese)
[7]李钢,李宏男.基于位移的消能减震结构抗震设计方法[J].工程力学,2007,24(9):88-94Li Gang, Li Hong-nan. Direct displacement-based design for buildings withpassive energy dissipation devices[J].Engineering Mechanics,2007,24(9):88-94(in Chinese)
[8] Priestley M,Kowalsky M. Displacement-based seismic design of structures[M]. Pavia:IUSS PRESS,2007
[9] Lin Y Y, Tsai M, Hwang J. Chang K. Direct displacement-based design for building with passive energy dissipation systems[J]. Engineering Structures,2003,25(1):25-37
[10] GB 50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for seismic design of buildings[S](in Chinese)
[11]江义,杨迪雄,李刚.近断层地震动向前方向性效应和滑冲效应对高层钢结构地震反应的影响[J].建筑结构学报,2010,31(9):103-110Jiang Yi,Yang Di-xiong,Li Gang. Effects of forward directivity and fling step of near-fault ground motions on seismic responses of high-rise steel structure[J].Journal of Building Structures,2010,31(9):103-110(in Chinese)