ABSTRACT
Structural vibration control is one of the most important functions of a smart civil structure subjected to dynamic loadings such as strong winds and severe earthquakes. Control devices and control systems were described in Chapter 4 and a variety of control algorithms were introduced in Chapter 9. Passive control strategies, including base isolation systems, viscoelastic dampers, tuned mass dampers (TMDs) and fluid dampers, have been developed into workable technologies in the past four decades for mitigating the effects of dynamic loadings on civil structures. However, these passive control systems are unable to adapt to structural changes and to varying use patterns and loading conditions. Serious efforts have been undertaken in the past two decades to develop active, semi-active and hybrid control concepts into workable technologies. This chapter first gives a brief introduction to the full-scale implementations of passive, active, semi-active and hybrid control systems. The theoretical investigation of the active control of adjacent buildings using hydraulic actuators is then presented as a potential full-scale implementation case. The experimental investigations of the semi-active control of a complex structure using semi-active friction dampers and magnetorheological (MR) dampers are, respectively, carried out and introduced in this chapter as two promising real implementation cases. This chapter finally introduces the multi-objective hybrid control of high-tech equipment in a high-tech facility using both passive dampers and smart actuators to ensure the functionality of high-tech equipment against microvibration under normal working conditions and to protect high-tech equipment from damage when an earthquake occurs.
