Sensitivity Analysis of Energy Dissipation in a Yielding Damper with Cantilever Bars

Document Type : Research Note

Authors

1 Faculty of Civil Engineering of K. N. Toosi University of Technology, Tehran, Iran.

2 Civil Engineering Department, K. N. Toosi University of Technology, Tehran, Iran

Abstract

Seismic isolators serve a vital function in mitigating structural damage resulting from lateral loads and in diminishing the forces exerted upon the structure. In structures that are isolated, the displacement may experience a substantial increase, which, in the case of bridges, could potentially result in the collapse of the deck from its supports. In addition, isolator systems may have low energy absorption capacity. Controlling displacement and ensuring adequate energy dissipation in isolated structures under wind and earthquake loads proves the importance of incorporating devices like energy dampers alongside seismic isolators. Yielding dampers are a category of dampers recommended in previous research, which are produced in various types. These dampers utilize the inelastic deformation of ductile metals to dissipate the energy. One effective type of damper for energy dissipation in isolated structures is the bar-shaped damper with cantilever bars. In these dampers, the bars are positioned vertically, so that energy is dissipated regardless of the direction. The energy-absorbing elements in these dampers are the cantilever bars, with one end connected to the substructure and the other to the isolated structure. As relative displacement occurs between the substructure and isolated structure, the bars undergo bending and enter the plastic deformation range, so that dissipating earthquake energy occurs. The behavior of these dampers is influenced by parameters such as bar diameter, bar length, number of bars, and bar yield stress. Hence, determining the effect of each parameter on damper performance is crucial for selecting a suitable damper. In this study, after modeling a bar damper with a cantilever bar in the ABAQUS finite element software, the effect of changes in each of these parameters on the damper's energy dissipation was analyzed. The results demonstrate that energy dissipation in this damper is most sensitive to changes in bar diameter, followed by the number of bars, bar length, and bar yield stress. 

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References

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