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Structural Monitoring and Maintenance
  Volume 8, Number 4, December 2021 , pages 329-344

Configuration assessment of MR dampers for structural control using performance-based passive control strategies
Zubair R. Wani, Manzoor A. Tantray, Javed Iqbal and Ehsan Noroozinejad Farsangi

    The use of structural control devices to minimize structural response to seismic/dynamic excitations has attracted increased attention in recent years. The use of magnetorheological (MR) dampers as a control device have captured the attention of researchers in this field due to its flexibility, adaptability, easy control, and low power requirement compared to other control devices. However, little attention has been paid to the effect of configuration and number of dampers installed in a structure on responses reduction. This study assesses the control of a five-story structure using one and two MR dampers at different stories to determine the optimal damper positions and configurations based on performance indices. This paper also addresses the fail-safe current value to be applied to the MR damper at each floor in the event of feedback or control failure. The model is mathematically simulated in SIMULINK/MATLAB environment. Linear control strategies for current at 0 A, 0.5 A, 1 A, 1.5 A, 2 A, and 2.5 A are implemented for MR dampers, and the response of the structure to these control strategies for different configurations of dampers is compared with the uncontrolled structure. Based on the performance indices, it was concluded that the dampers should be positioned starting from the ground floor, then the 2nd floor followed by 1st and rest of the floors sequentially. The failsafe value of current for MR dampers located in lower floors (G+1) should be kept at a higher value compared to dampers at top floors for effective passive control of multi-story structures.
Key Words
    configuration; linear control; MR damper; performance index; structural dynamics; structural response
(1) Zubair R. Wani, Manzoor A. Tantray:
Department of Civil Engineering, National Institute of Technology Srinagar, India;
(2) Javed Iqbal:
Department of Electrical Engineering, National Institute of Technology Srinagar, India;
(3) Ehsan Noroozinejad Farsangi:
Faculty of Civil and Surveying Engineering, Graduate University of Advanced Technology, Kerman, Iran;
(4) Ehsan Noroozinejad Farsangi:
School of Civil Engineering and the Built Environment, University of Johannesburg, Johannesburg, South Africa;
(5) Ehsan Noroozinejad Farsangi:
International Institute for Urban Systems Engineering (IIUSE), Southeast University, Nanjing, China;
(6) Ehsan Noroozinejad Farsangi:
Smart Structures Research Group, The University of British Columbia, Vancouver, Canada.

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