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Structural Engineering and Mechanics   Volume 65, Number 6, March25 2018, pages 721-730
Adaptive control of rotationally non-linear asymmetric structures under seismic loads
Fereidoun Amini, Hassan Rezazadeh and Majid Amin Afshar

Abstract     [Full Text]
    This paper aims to inspect the effectiveness of the Simple Adaptive Control Method (SACM) to control the response of asymmetric buildings with rotationally non-linear behavior under seismic loads. SACM is a direct control method and was previously used to improve the performance of linear and non-linear structures. In most of these studies, the modeled structures were two-dimensional shear buildings. In reality, the building plans might be asymmetric, which cause the buildings to experience torsional motions under earthquake excitation. In this study, SACM is used to improve the performance of asymmetric buildings, and unlike conventional linear models, the non-linear inertial coupling terms are considered in the equations of motion. SACM performance is compared with the Linear Quadratic Regulator (LQR) algorithm. Moreover, the LQR algorithm is modified, so that it is appropriate for rotationally non-linear buildings. Active tuned mass dampers are used to improve the performance of the modeled buildings. The results show that SACM is successful in reducing the response of asymmetric buildings with rotationally non-linear behavior under earthquake excitation. Furthermore, the results of the SACM were very close to those of the LQR algorithm.
Key Words
    rotational non-linearity; simple adaptive control method; active tuned mass damper; linear quadratic regulator; asymmetric buildings
Fereidoun Amini and Hassan Rezazadeh: School of Civil Engineering, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran
Majid Amin Afshar: Department of Technology and Engineering, Imam Khomeini International University Norouzian, P.O. Box 34149-16818, Qazvin, Iran

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