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Earthquakes and Structures Volume 4, Number 4, April 2013 , pages 365-381 DOI: https://doi.org/10.12989/eas.2013.4.4.365 |
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Ductility demand of partially self-centering structures under seismic loading: SDOF systems |
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Xiaobin Hu and Yunfeng Zhang
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| Abstract | ||
| In this paper, a numerical simulation study was conducted on the seismic behavior and ductility demand of single-degree-of-freedom (SDOF) systems with partially self-centering hysteresis. Unlike fully self-centering systems, partially self-centering systems display noticeable residual displacement after unloading is completed. Such partially self-centering behavior has been observed in a number of recently researched self-centering structural systems with energy dissipation devices. It is thus of interest to examine the seismic performance such as ductility demand of partially self-centering systems. In this study, a modified flag-shaped hysteresis model with residual displacement is proposed to represent the hysteretic behavior of partially self-centering structural systems. A parametric study considering the effect of variations in post-yield stiffness ratio, energy dissipation coefficient, and residual displacement ratio on the displacement ductility demand of partially self-centering systems was conducted using a suite of 192 scaled ground motions. The results of this parametric study reveal that increasing the post-yield stiffness, energy dissipation coefficient or residual displacement ratio of the partially self-centering systems generally leads to reduced ductility demand, especially for systems with lower yield strength. | ||
| Key Words | ||
| ductility; earthquake response; hysteresis; residual displacement; self-centering system | ||
| Address | ||
| Xiaobin Hu: School of Civil Engineering and Architecture, Wuhan University, Wuhan City, Hubei Province 430072, China; Yunfeng Zhang: Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, USA | ||