Effect of Ductility Level on the Seismic Behavior of Low Reinforced Concrete Moment-Resisting Frames Equipped by Double Friction Pendulum Bearings Isolation

Document Type : Regular Paper

Authors

1 Associate Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran

2 M.Sc., Department of Civil Engineering, Payame Noor University, Tehran, Iran

3 Ph.D., Natural Disasters Prevention Research Center, School of Civil Engineering, Iran University of Science & Technology, Tehran, Iran

4 Professor, Natural Disasters Prevention Research Center, School of Civil Engineering, Iran University of Science & Technology, Tehran, Iran

5 Assistant professor, Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, 39518-79611 Tafresh, Iran

Abstract

The base isolation method is being utilized for more than two decades as a way to protect structures. Despite recent advancements in the seismic evaluation of isolated structures, the impact of ductility level on based-isolated Reinforced Concrete (RC) moment-resisting frame structures has not been explored. In order to consider the effect of ductility level, the present paper evaluates the seismic behavior of isolated RC moment-resisting frames through Double Friction Pendulum Bearings (DFPB) with ordinary, intermediate, and special ductility. Additionally, we compared responses of these systems with the similar conventional structures. To this end, three RC moment-resisting frame structures were designed with/without DFPB, and three-dimensional (3D) models were implemented in OpenSees. Then, seismic responses of these six models, including peak floor absolute acceleration, base shear, plastic rotation, and story drift of column were evaluated. According to the results. Ductility levels have a significant impact on the fixed and isolated structures. As a result of the special moment-resisting frame superstructure, plastic rotation and peak drift demand of columns is increased compared to the ordinary and intermediate ones. The maximum differences in plastic rotation and peak drift demand between ordinary and special frames were obtained as approximately 70% and 50% in base-isolated buildings.

Graphical Abstract

Effect of Ductility Level on the Seismic Behavior of Low Reinforced Concrete Moment-Resisting Frames Equipped by Double Friction Pendulum Bearings Isolation

Highlights

  • Effects of ductility level on seismic responses of isolated moment frame buildings.
  • Seismic assessment of buildings with double friction pendulum bearings.
  • Comparative response evaluation of base-isolated and conventional RC frames.

Keywords

Main Subjects

References

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History

  • Receive Date: 31 May 2024
  • Revise Date: 20 January 2025
  • Accept Date: 09 March 2025

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