Response control of building structures based on autonomous-decentralized semiactive control scheme

针对可控油液阻尼器的使用，本课题组提出了变力液位阻尼器作为自主分散的半主动控制系统的概念。基于提出的概念，本研究主要研究了磁流变阻尼器使用中的几个问题。在磁流变液中，随着时间的推移，磁体内部会发生强磁粒子的沉积。这一现象改变了磁流变液的某些力学性质。从数学处理的角度，证明了弹塑性建模技术能够有效地描述磁流变液阻尼器的行为。利用该建模技术，证明了以阻尼器延性系数为2为目标的控制算法在理想的稳态正弦激励情况下具有最优的耗能效果。计算机仿真表明，即使在非平稳地震激励下，基于MR阻尼器的变滑移力水平阻尼器也可以用该算法进行控制，同时也证明了采用所设计的微处理器的控制器可以与使用PC的控制器一样有效地工作。此外，“自治-分散”系统的概念对于对某些局部地区的建筑物进行结构健康监测也是非常有效的。提出了基于智能无线传感器的建筑物应急评估方案，作为自主分散的健康监测网络。

The head investigator has area proposed the concept of variable -force level dampers as autonomous-decentralized semiactive control system accounting for the use of controllable oil hydraulic dampers. Based upon the proposed concept this research mainly deals with several issues on the use of MR dampers.In MR fluid contained in MR dampers the sedimentation of strong magnetic corpuscles inside occurs along with the time passage. This phenomenon changes certain mechanical property of MR fluid. A control algorithm is proposed with this effect considered.From the mathematical treatment point of view, it is demonstrated that elastic perfectly plastic modeling technique effectively describes the behavior of MR dampers. Utilizing this modeling technique the control algorithm targeting at a damper ductility factor of two is proved to make optimum energy dissipation in case of ideal steady-state sinusoidal excitation. Computer simulations demonstrates that MR damper based variable slip-force level dampers could work out with this algorithm even during nonstationary seismic excitation,It is also demonstrated that the controller using a manufactured microprocessor could work as effectively as the controller using PC.In addition, the concept of "autonomous-decentralized" system is also very effective for conducting structural health monitoring of the buildings in certain local area. Smart, wireless sensor based urgent assessment scheme of those buildings is proposed as autonomous-decentralized health monitoring network.