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ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) VOL. 12, NO. 5 (2011) PAGES 637-649 SEISMIC MITIGATION OF TALL BUILDINGS USING MAGNETO- RHEOLOGICAL DAMPERS B. Farahmand Azar * , N. Mohajer Rahbari and S. Talatahari Department of Civil Engineering, University of Tabriz, Tabriz, Iran Received: 5 September 2010 Accepted: 10 February 2011 ABSTRACT In this paper, semi-active response control of tall buildings equipped with magnetorheological dampers is studied. Clipped-optimal control algorithm based on linear quadratic regulator (LQR) is employed for semi-active controller design. Bouc-Wen phenomenological model is utilized to investigate the nonlinear behavior of the MR dampers. The performance of the resulting control system is compared to the uncontrolled structure for a benchmark building through simulation, and the efficiency of using MR dampers is evaluated. Keywords: Structural control; semi-active control; clipped-optimal algorithm; Magneto- Rheological (MR) damper; Bouc-Wen phenomenological model; seismic r esponse 1. INTRODUCTION Recent advances in civil structures such as high-rise buildings, towers and long span bridges go with an additional flexibility and insufficient inherent damping, which lead t o an increase in their susceptibility to external excitation. Therefore, these flexible structures are susceptible to be exposed to excessive levels of vibration under the actions of a strong wind or earthquake. The protection of such structures from natural hazards puts an important task for engineers and researchers. To ensure the functional performance of flexible structures against such undesirable vibrations, various design alternatives have been developed, ranging from alternative structural systems to modern control systems with the use of various types of control devices. In general, we could classify modern control systems into four categories, namely passive, active, semi-active and hybrid. Among these modern control systems, the semi-active approach has recently received considerable attention, because it offers significant adaptability without large power requirements. Actually, semi-active control systems are consisted of improved passive devices which have controllable dynamic properties that alter at any moment according to the feedback or feedforward data to achieve an optimal performance. The magneto- * E-mail address of t he corresponding author: [email protected] (B. Farahmand Azar)

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