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http://dx.doi.org/10.5000/EESK.2007.11.2.057

Vibration Control of Mega Frame Structures using a Semi-active Tuned Mass Damper  

Kim, Hyun-Su (성균관대학교 건축공학과)
Lee, Dong-Guen (성균관대학교 건축공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.11, no.2, 2007 , pp. 57-68 More about this Journal
Abstract
The mega frame system is becoming popular for the design and construction of skyscrapers because this system exhibits structural efficiency by allowing high rigidity of the structure while minimizing the amount of structural materials to be used. Since the mega frame system is usually adopted for super high-rise buildings, the comfort of occupants may be main concerns in the practical application of this system. For the enhancement of the serviceability of mega frame structures, a semi-active tuned mass damper (STMD) is developed in this study. To this end, a Magnetorheological (MR) damper is employed replacing passive damper as a semi-active damper to improve the control effect of a conventional TMD. Since a conventional finite element model of mega frame structures has significant numbers of DOFs, numerical simulation for investigation of control performances of a STMD is impossible by using the full-order model. Therefore, a reduced-order system using minimal DOFs, which can accurately represent the dynamic behavior of a mega frame structure, is proposed in this study through the matrix condensation technique To improve the efficiency of the matrix condensation technique, multi-level matrix condensation technique is proposed using the structural characteristics of mega frame structures. The efficiency and accuracy of the reduced-order control proposed in this study and the control performance of a STMD were verified using example structures.
Keywords
semi-active tuned mass damper; vibration control; MR damper; mega frame structure; multi-level matrix condensation technique;
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