Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Optimum Design and Investigation of the Operational Mechanism of Hybrid Friction and Metallic Yielding Dampers for Multi-level Vibration Control

Document Type : Original Article

Authors
1 Associate professor, Faculty of Mining, Civil and Chemical Engineering, Brijand University of Technology, Birjand, Iran
2 PhD student, Faculty of civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
Metallic yielding dampers (MYD) often fail to provide adequate energy dissipation under mild vibrations, such as low seismic loads or strong winds, as they remain in an elastic state. This research aims to develop a hybrid damper suitable for various levels of seismic and wind vibrations. The proposed hybrid damper integrates metallic yielding dampers (MYD) and friction dampers (FD) in a series configuration. The behavior mechanism of this combined damper is tailored so that, under mild seismic vibrations and wind conditions where the MYD remains elastic, the friction damper engages. Conversely, under severe seismic loads, both the FD and MYD operate concurrently. The design methodology for the FD and MYD dampers is predicated on the elastic force of the metallic damper and the uniform stress distribution throughout the metallic element, respectively. This study proposes an optimal geometry for the metallic damper characterized by a specific shape factor, λ=1.6 (〖mm〗^0.5). Subsequently, the behavioral mechanism of the proposed hybrid damper was assessed using the ASCE loading protocol. The findings indicate that the proposed damper exhibits stable hysteretic behavior and a high energy dissipation capacity. Also, the MYD with the above shape factor is capable of withstanding a maximum displacement range of more than 40 (mm) and a cumulative displacement of more than 1500 (mm) under the desired loading protocol; which indicates the high energy dissipation capacity of the above damper relative to the volume of steel consumed. Additionally, by addressing buckling constraints, the capacity of the hybrid damper has been enhanced, allowing it to endure more cycles and has increased the ductility of the hybrid damper by about 30%.
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  • Receive Date 27 August 2024
  • Revise Date 18 November 2024
  • Accept Date 04 December 2024