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ACTIVE VIBRATION CONTROL OF STRUCTURES AGAINST EARTHQUAKES USING MODERN CONTROL THEORY

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Structural control against earthquakes is becoming increasingly important. The linearquadratic optimal control algorithm is proposed here to design active control system for buildings against earthquake excitations. Full-state feedback system has been adopted. Active Tuned Mass Damper is used as the control mechanism. The efficiency of the designed system has been verified against El-Centro earthquake. Active control gives 35% more reduction in vibration of the structure than passive control. Mass of the damper has appreciable effects on response parameters than its stiffness. A flexible damper proves to be more effective, but at the cost of actuating forces required. Performance of system is found to be optimum, when mass-damper is tuned to fundamental frequency of the structure. Stability of the structure is also enhanced by Active Control system. A SDOF building is presented to illustrate the study

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