Abstract: In this paper, a self-centering rotational viscoelastic coupling beam damper with shape memory alloy (SMA) was proposed to enhance the seismic resilience of structures and achieve high-performance seismic objectives. To validate the effectiveness of the structural system with self-centering dampers, a conventional reinforced concrete frameshear wall structure and a concrete frame with self-centering dampers were designed, and nonlinear time-history analysis and incremental dynamic analysis (IDA) were conducted through nonlinear finite element models. Firstly, the response characteristics of the two types of structures under the maximum considered earthquakes (MCEs) were analyzed. Furthermore, with peak ground acceleration as the ground motion intensity measure, and maximum inter-story drift ratio and maximum residual drift ratio as the damage measures, the probabilistic seismic demand models and fragility curves under four different structural damage states were obtained according to the IDA results, which quantified the effects of the self-centering dampers on the seismic performance and post-earthquake recoverable performance of the reinforced concrete frame-shear wall structure. The results show that under maximum considered earthquakes, the residual drift ratio of the self-centering frame can be reduced by 34%; the post-earthquake recovery performance can be improved by 23%, and the self-centering frame has good seismic collapse resistance.

Key words: self-centering, shape memory alloy, viscoelastic, seismic fragility analysis, seismic resilience