Implementation of energy method and evaluation of ductility reduction factors accuracy to estimate the seismic response of self-centering structures

Document Type : Research Article

Authors

1 PhD Student in Civil Engineering, Faculty of Civil Engineering, Zanjan University, Iran

2 Associate Professor, Department of Civil Engineering, Faculty of Civil Engineering, Zanjan University, Zanjan, Iran

3 Assistant Professor, Department of Civil Engineering, Faculty of Civil Engineering, Zanjan University, Zanjan, Iran

Abstract

Self-centering structures have been introduced to overcome the financial and social difficulties of rebuilding structural damage caused by the residual deformation of structures. On the other hand, applying the force method as a common approach to the design of many structural systems cannot predict the actual performance of this advanced system. Meanwhile, energy-based approaches provide more accurate results than force-based approaches by selecting the desired yield mechanism and the desired displacement at the outset of the design process. In this study, the feasibility of using the energy method to compute the seismic performance of the self-centering concentrically-braced frame (SC-CBF) was evaluated for the first time. Comparing the calculated results with the laboratory and analytical outputs showed that the energy method is an efficient technique that can accurately estimate the structural response without any complex modeling. Also, by comparing the different ductility reduction relationships, it was observed that the equation presented by Lai-Biggs is the most appropriate relationship with more than 80% accuracy because of artificial earthquake records applications. Furthermore, the results revealed that the structure’s ultimate rotation and ductility ratio decreased by raising the structure elevation. The height increase improved the accuracy of predicted values from the energy method with other relationships to estimate the structural response.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 7
October 2022
Pages 2509-2526

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