A hybrid self-centering building toward seismic resilient structures: Design procedure and fragility analysis

The current paper presents the development and seismic assessment of the Smart Hybrid Resilient building (SHR). This novel building is comprised of self-centering dampers in parallel with Pall friction dampers. The design methodology and equations are first introduced with aim of creating the seismic resilience feature in structures. The designed SHR systems have the capability to adjust and control the residual drift of each story (covers the disadvantage of Pall system) in addition to high energy-dissipating capacity (covers the downside of expensive shape memory alloy-based system). Based on FEMA P-58 recommendation, 0.2% and 0.5% drift ratios are considered as the economical residual drift limitations of specimens. Limiting the story residual drift to these thresholds makes the decision of repairing structure after earthquake occurrence more rational rather than rebuilding the new one. In order to the comprehensive assessment of SHR system performance and precision of design equations, some specimens with diverse heights and various consumed shape memory alloy materials are modeled in OpenSees. Afterwards, all the SHR specimens in comparison with purely Self-Center systems are subjected to quasi-static cyclic loading analysis and incremental dynamic analysis. Fragility curves are also used to evaluate the efficiency of seismic performance of the SHR system in a probabilistic framework. The results demonstrate that the SHR buildings designed with suggested design methods are conservatively and precisely satisfied the seismic resilience criterion.