非线性结构利用摩擦阻尼器振动控制的优化设计  

OPTIMAL DESIGN OF FRICTION DAMPERS FOR NONLINEAR STRUCTURAL VIBRATION CONTROL

作　　者：赵大海[1] 李宏男[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,大连116024

出　　处：《振动与冲击》2007年第10期35-40,共6页Journal of Vibration and Shock

基　　金：教育部长江学者创新团队发展计划(IRP0518);科技部十一五科技支撑计划项目

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.

关 键 词：摩擦阻尼器 非线性结构 遗传算法 BOUC-WEN模型 

分 类 号：TU352.1[建筑科学—结构工程]