非线性结构利用摩擦阻尼器振动控制的优化设计
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摘要
研究了强烈地震作用下非线性结构中摩擦阻尼器的参数优化问题。非线性结构的恢复力和摩擦阻尼器的滞回特性分别用连续的Bouc-Wen模型表示,利用遗传算法以相对性能指标为目标函数对阻尼器的参数进行优化,比较了不同地震波下摩擦阻尼器的减震效果。取一个八层结构为例进行计算,结果表明,摩擦阻尼器能有效地减小非线性建筑结构在强烈地震下的响应,Bouc-Wen模型能够较好地模拟摩擦阻尼器的滞回性能,使用遗传算法优化后摩擦阻尼器的参数,提高了结构的减震效果。
The parameter optimization of friction dampers is investigated for nonlinear structures subjected to severe seismic excitations. The continuous Bouc-Wen model is used to characterize the restoring force of a nonlinear structure and the hysteretic force-deformation behaviour of a friction damper, respectively. The determination of optimal parameters for a friction damper is solved by using genetic algorithm with the objective function called as the relative performance index. The control effects under different earthquakes by using friction dampers are compared. An eight-storey nonlinear structural model is selected as an example. The numerical results indicate that the friction damper is capable of reducing dynamic response of a nonlinear structure with severe seismic excitations, the Bouc-Wen model can describe the hystere-tic behaviour of the friction damper, the optimal parameters of the friction damper obtained by genetic algorithm can improve the aseismic effects.
The parameter optimization of friction dampers is investigated for nonlinear structures subjected to severe seismic excitations. The continuous Bouc-Wen model is used to characterize the restoring force of a nonlinear structure and the hysteretic force-deformation behaviour of a friction damper, respectively. The determination of optimal parameters for a friction damper is solved by using genetic algorithm with the objective function called as the relative performance index. The control effects under different earthquakes by using friction dampers are compared. An eight-storey nonlinear structural model is selected as an example. The numerical results indicate that the friction damper is capable of reducing dynamic response of a nonlinear structure with severe seismic excitations, the Bouc-Wen model can describe the hystere-tic behaviour of the friction damper, the optimal parameters of the friction damper obtained by genetic algorithm can improve the aseismic effects.
引文
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[7]Ciampi V,Angelis M D,Paolacci F.Design of yielding or friction-based dissipative bracings for seismic protection of buildings[J].Engineering Structures,1995,17(5):381—391.
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[12]孙作玉,王晖.地震激励下非线性结构的隔震换能控制[J].土木工程学报,2005,38(7):6—10.
[2]Li HN,Yin Y W,Wang S Y.Studies on seismic reduction of story-increased buildings with friction layer and energy-dis-sipated devices[J].Earthquake Engineering and Structural Dynamics,2003,32(14):2143—2160.
[3]Soong TT,Dargush G F.Passive energy dissipation systems in structural engineering[M].New York:Wiley,1997.
[4]Moreschi L M,Singh M P.Design of yielding metallic and friction dampers for optimal seismic performance[J].Earth-quake Engineering and Structural Dynamics,2003,32(8):1291—1311.
[5]Singh M P,Moreschi L M.Optimal seismic response control with dampers[J].Earthquake Engineering and Structural Dynamics,2001(30):553—572.
[6]徐玉野,王全凤,罗漪.地震作用下摩擦耗能减震结构优化分析的遗传算法求解[J].计算力学学报,2005,22(1):83—88.
[7]Ciampi V,Angelis M D,Paolacci F.Design of yielding or friction-based dissipative bracings for seismic protection of buildings[J].Engineering Structures,1995,17(5):381—391.
[8]Constantinou MC,Mokha A,Reinhom A M.Teflon bearings in base isolation.II:Modeling[J].Journal of Structural En-gineering,1990,116(2):455—474.
[9]周明,孙树栋.遗传算法原理及应用[M].北京:国防工业出版社,1999.
[10]雷英杰.MATLAB遗传算法工具箱及应用[M].西安:西安电子科技大学出版社,2005.
[11]Filiatrault A,Cherry S.Seismic design spectra for friction-damped structures[J].Journal of structural Engineering,1990,116(5):1334—1355.
[12]孙作玉,王晖.地震激励下非线性结构的隔震换能控制[J].土木工程学报,2005,38(7):6—10.
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