MR智能基础隔震结构的抗震分析

Seismic Response Analysis of Intelligent Base-Isolated Structure with MR Damper

关键词:  基础隔震结构  MR阻尼器  抗震分析  模糊半主动控制  地震反应

Key words:  base-isolated struture  magnetorheological fluid damper  response analysis  fuzzy semi-active control  earthquake response

摘要:

为研究MR智能基础隔震结构的抗震性能,应用双线性恢复力模型来描述基础橡胶隔震垫的弹塑性特性,通过模糊半主动控制策略计算MR阻尼器的控制力,建立该混合控制结构的数学模型,并对某MR智能基础隔震的框架结构进行地震作用下的时程反应分析.仿真分析表明:MR智能基础隔震系统不仅能够减小上部结构的地震反应,而且还能够有效地保护基础隔震系统免于因过大变形而产生失效破坏,说明MR智能基础隔震结构是一种性能优异的智能控制系统.

Abstract:

The performance of intelligent base-isolated structure with MR damper for suppressing the seismic response is studied.The numerical model of the hybrid control system is established.The bilinear hysteretic model is applied to simulate the hysteretic characteristics of the rubber bearing isolation cushion.The fuzzy semi-active control strategy is employed to calculate the force of the MR damper.Simulated analysis demonstrates that the MR intelligent base-isolated system can not only significantly reduce the earthquake response of upper structure,but also protect the deformation of base-isolated system from damage.Intelligent base-isolated system becomes a practical and useful control system.