Structural Monitoring and Maintenance

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Configuration assessment of MR dampers for structural control using performance-based passive control strategies

  • Wani, Zubair R. (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Tantray, Manzoor A. (Department of Civil Engineering, National Institute of Technology Srinagar) ;
  • Iqbal, Javed (Department of Electrical Engineering, National Institute of Technology Srinagar) ;
  • Farsangi, Ehsan Noroozinejad (Faculty of Civil and Surveying Engineering, Graduate University of Advanced Technology)
  • Received : 2021.04.22
  • Accepted : 2021.09.29
  • Published : 2021.12.25
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Abstract

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.

Keywords

Acknowledgement

The authors would like to express thanks to the Civil Engineering Department and Electrical Engineering Department of the National Institute of Technology Srinagar, India, for providing support to conduct the work associated with this study.

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