Abstract:Self-centering structures can undergo large deformation with minor residual displacement under the strong earthquake excitations, exhibiting flag-shaped hysteretic behaviors.The dynamic elastic-plastic analysis of the systems of bilinear elastic (EP) model and self-centering (SC) model was conducted to acquire the ductility demand factor μ for different seismic modification factor R.It is shown that self-centering systems develop greater ductility demands than cast-in-place RC systems when the lateral strength and post-yielding stiffness keep the same.When the post-uplifting stiffness and hysteretic energy dissipation capacity of the self-centering systems are increased, the ductility demands decrease obviously.
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