Earthquakes and Structures

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Exploring the effects of tuned mass dampers on the seismic performance of structures with nonlinear base isolation systems

  • Hessabi, Reza Mirza (Department of Civil Engineering, University of Toronto) ;
  • Mercan, Oya (Department of Civil Engineering, University of Toronto) ;
  • Ozturk, Baki (Civil Engineering Department, Hacettepe University)
  • Received : 2016.05.04
  • Accepted : 2017.02.12
  • Published : 2017.03.25
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Abstract

Base isolation is a quite practical control strategy for enhancing the response of structural systems induced by strong ground motions. Due to the dynamic effects of base isolation systems, reduction in the interstory drifts of the superstructure is often achieved at the expense of high base displacement level, which may lead to instability of the structure or non-practical designs for the base isolators. To reduce the base displacement, several hybrid structural control strategies have been studied over the past decades. This study investigates a particular strategy that employs Tuned Mass Dampers (TMDs) for improving the performance of base-isolated structures and unlike previous studies, specifically focuses on the effectiveness of this hybrid control strategy in structures that are equipped with nonlinear base isolation systems. To consider the nonlinearities of base isolation systems, a Bouc-Wen model is selected and nonlinear dynamic OpenSees models are used to perform several time-history simulations in time and frequency domains. Through these numerical simulations, the effects of several parameters such as the fundamental period of the structure, dynamic properties of the TMD and isolation systems and properties of the input ground motion on the behaviour of TMD-structure-base isolation systems are examined. The results of this study provide a better insight into the performance of linear shear-story structures with nonlinear base isolators and show that there are many scenarios in which TMDs can still improve the performance of these systems.

Keywords

References

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