Earthquakes and Structures

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Performance of double-tuned mass dampers in controlling structural vibrations

  • Mohammed, Fasil (Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals) ;
  • R., Sajeeb (Department of Civil Engineering, TKM College of Engineering) ;
  • Nizar A., Assi (Department of Civil and Environmental Engineering, Birzeit University) ;
  • Muhammad K., Rahman (Interdisciplinary Research Center for Construction and Building Materials, KFUPM)
  • Received : 2021.12.16
  • Accepted : 2022.12.16
  • Published : 2023.01.25
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Abstract

Structural vibrations generated by earthquakes and wind loads can be controlled by varying the structural parameters such as mass, stiffness, damping ratio, and geometry and providing a certain amount of passive or active reaction forces. A Double-Tuned Mass Dampers (DTMDs) system, which is simple and more effective than the conventional single tuned mass damper (TMD) system for vibration mitigation is presented. Two TMDs tuned to the first two natural frequencies were used to control vibrations. Experimental investigations were carried out on a three degrees-of-freedom frame model to investigate the effectiveness of DTMDs systems in controlling displacements, accelerations, and base shear. Numerical models were developed and validated against the experimental results. The validation showed a good match between the experimental and numerical results. The validated model was employed to investigate the behavior of a five degrees-of-freedom shear building structure, wherein mass dampers with different mass ratios were considered. The effectiveness of the DTMDs system was investigated for harmonic, seismic, and white noise base excitations. The proposed system was capable of significantly reducing the story displacements, accelerations, and base shears at the first and second natural frequencies, as compared to conventional single TMD.

Keywords

Acknowledgement

The authors would like to express their gratitude and appreciation to the Civil and Environmental Engineering Department at KFUPM, the Department of Civil Engineering at TKM College of Engineering, and the Department of Civil and Environmental Engineering at Birzeit University.

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