OVERVIEW OF PASSIVE, ACTIVE AND HYBRID VIBRATION CONTROL OF STRUCTURES AGAINST EARTHQUAKES

Historical development of passive and active vibration control of structures for their protection against earthquake is reviewed. Several base-isolation devices including laminated rubber bearing, and various frictional systems for seismic protection of buildings are described. It is shown that the acceleration transmitted to compact stiff structures during an earthquake can be significantly reduced by using appropriate base-isolation systems. Responses of some generic buildings with and without rubber bearing and frictional base-isolation system subject to different seismic excitations including the El Centro 1940 Earthquake are described and the effectiveness of various isolation system for protecting the structure and structural contents are discussed. Stochastic approach for response analysis of base-isolated structures is also described and several examples are provided. In addition, the recent development on active control of structural vibrations during earthquakes is discussed and the methodology for hybrid seismic control is described. Various control algorithms are presented and discussed. Particular attention is given to the recently developed concept of preview active and hybrid control for seismic protection of structures. Sampleexamples are presented and the potential of the new approach is pointed out.

کلیدواژه ها:

Base Isolation ، Passive Control ، Active Control. Hybrid Control ، Preview Control