Probabilistic performance assessment of seismically excited buildings with semi-active fluid viscous dampers

Document Type : Research

Authors

1 Professor Assistant, Mechanical Engineering Department, Imam Ali University, Tehran, Iran.

2 Ph.D., Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

3 Ph.D., Faculty of Engineering, University of Tehran, Tehran, Iran.

Abstract

This paper presents a procedure to assess the probabilistic performance of the semi-active fluid viscous dampers (SAFVDs) utilized in seismically excited buildings. Some efficient on-off semi-active control algorithms based on motion towards or away from equilibrium, sky-hook, and ground-hook have been considered to determine the variable damping in each time step. The probabilistic relationship between intensity measure (IM) and seismic demand of the building has been estimated based on cloud analysis. A linear regression analysis has been employed to calculate the probabilistic demand parameters. A three-story nonlinear shear-type building equipped with SAFVDs has been adopted for the numerical example. The building has been subjected to a set of 20 actual earthquke records with the probability of occurrence of 10% in 50 years for the site of interest. The probabilistic performance of the nonlinear building equipped with SAFVDs has been assessed in terms of demand and fragility curves. The results indicate the effectiveness of the SAFVD systems in mitigating the fragility and enhancing the safety of the building. Particularly, a fragility reduction of about 51% is achieved at the immediate occupancy (IO) performance level using the SAFVD system.

Keywords

References

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Numerical Methods in Civil Engineering
Volume 7, Issue 1
September 2022
Pages 16-27

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History

  • Receive Date: 21 August 2021
  • Revise Date: 08 May 2022
  • Accept Date: 11 May 2022

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