设置磁流变阻尼器的高层钢框架支撑体系的地震反应研究

Seismic Response Control of Tall Steel Frame-brace Structure Using MR Dampers

磁流变(MR)阻尼器是一种性能十分优秀的减振装置,具有构造简单、调节驱动容易和反应迅速等优点,能有效减小工程结构的地震反应和风振反应,具有广阔的应用前景。本文研究了安装MR阻尼器的高层钢结构框架支撑体系的抗震性能。在介绍了MR阻尼器力学模型的基础上,推导了MR阻尼器-支撑框架系统的地震反应基本方程,并且采用了基于最优主动控制力的“开关-耗能”半主动控制策略对MR阻尼器实施控制。应用本文方法对一栋20层的高层钢结构进行了模拟计算,结果表明:安装了MR阻尼器的框架支撑体系的抗震性能明显优于纯框架支撑体系,是一种简单、方便和有效的减振系统。

Magnetorheological （MR） damper is a kind of excellent seismic mitigation devices. Because of its mechanical simplicity, high dynamic range, low power requirement and large force capacity, they have been shown to mesh well with application demands and constraints to offer an attractive means against severe earthquake and strong wind. MR damper brace system is proposed in this study and the seismic efficacy is also investigated. On the basis of the mechanical model of MR dampers, dynamic formulation of structure-damper-brace system is established and the optimal force semi-active control strategy is applied to control MR dampers. The work on the example building shows that the installation of the MR dampers can significantly reduce seismic responses of tall steel structure, and the performance of MR damper brace system is better than that of the common brace.