单轴平扭耦联基础隔震结构动力简化分析
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摘要
为了建立单轴平扭耦联基础隔震结构的动力简化分析方法,探讨了影响结构扭转反应的参数取值规律,首先基于层单元模型,通过假定上部结构楼层回转半径、偏心距、弹力半径相等,推导了单轴平扭耦联基础隔震结构线性化的动力计算方程;其次,运用该简化分析方程,通过一算例进行了动力响应的参数分析。结果表明:调整隔震层刚心使其与上部结构质心位置接近,可显著降低偏心隔震结构扭转反应;增大隔震层刚度半径及阻尼半径可有效减少或抑制结构扭转反应;所建简化分析方程能有效模拟偏心隔震结构动力响应。
For establishing simplified calculation analysis of single-axis lateral-torsional isolated structures and investigating rules which affect values of parameters in torsional structure responses,firstly,based on layer element model,a linear dynamic calculation equation of single-axis lateral-torsional isolated structures was deduced through a presumption that each storey of superstructure has equal gyratory radius,eccentricity and elastic radius,then we used the simplified equation to analyze parameters in dynamics responses by an example.The results show that: a position nearness between stiffness center of isolation and mass center of superstructure,as good as increasing stiffness radius and damping radius of isolation layer can significantly reduce the torsional response of eccentric isolation structure;in conclusion,our simplified analysis equation is available in simulating the dynamic responses in eccentric isolation structure.
For establishing simplified calculation analysis of single-axis lateral-torsional isolated structures and investigating rules which affect values of parameters in torsional structure responses,firstly,based on layer element model,a linear dynamic calculation equation of single-axis lateral-torsional isolated structures was deduced through a presumption that each storey of superstructure has equal gyratory radius,eccentricity and elastic radius,then we used the simplified equation to analyze parameters in dynamics responses by an example.The results show that: a position nearness between stiffness center of isolation and mass center of superstructure,as good as increasing stiffness radius and damping radius of isolation layer can significantly reduce the torsional response of eccentric isolation structure;in conclusion,our simplified analysis equation is available in simulating the dynamic responses in eccentric isolation structure.
引文
[1]武田寿一.建筑物隔震防振与控振[M].北京:中国建筑工业出版社,1997:83-95.Takeda Hisaichi.Isolation,vibration prevention and control of building[M].Beijing:China Architecture&Building Press,1997:83-95.
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997:21-26.Zhou F L.Damping control of engineering structures[M].Beijing:Earthquake Press,1997:21-26.
[3]Nagarajaiah S,Reinhorn A M,Constantinou M C.Torsion in base-isolated structures with elastomeric isolation systems,Journal of Structure.En-gineering,1993,119(12):2932-2951.
[4]Tena Colunga.A,Gomez soberon L.Torsional response of base-isolated structures due to asynunetries in the superstructure[M].Engineeringstructures,2002:3-5.
[5]江宜城,唐家祥.单轴偏心的基础隔震结构扭转反应分析[J].华中理工大学学报,1999,27(6):80-82.Jiang Y C,Tang J X.Single shaft Torsional response analysis of base isolation structure[J].Journal of Huazhong Science and Technology Universi-ty,1999,27(6):80-82.
[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997:21-26.Zhou F L.Damping control of engineering structures[M].Beijing:Earthquake Press,1997:21-26.
[3]Nagarajaiah S,Reinhorn A M,Constantinou M C.Torsion in base-isolated structures with elastomeric isolation systems,Journal of Structure.En-gineering,1993,119(12):2932-2951.
[4]Tena Colunga.A,Gomez soberon L.Torsional response of base-isolated structures due to asynunetries in the superstructure[M].Engineeringstructures,2002:3-5.
[5]江宜城,唐家祥.单轴偏心的基础隔震结构扭转反应分析[J].华中理工大学学报,1999,27(6):80-82.Jiang Y C,Tang J X.Single shaft Torsional response analysis of base isolation structure[J].Journal of Huazhong Science and Technology Universi-ty,1999,27(6):80-82.
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