Inter-story drift ratio spectra-based seismic design method of earthquake resilient dual-systems
The seismic resilience-oriented design of earthquake resilient systems needs to address the quantification problem between post-earthquake functional recovery demand and seismic resilience capability.Therefore,the inter-story drift ratio(IDR)was taken as the main design measure and the extended flexural-shear double beam model was used to preliminarily establish an IDR spectra-based seismic design method for earthquake resilient dual-systems.A two-stage design framework and process was adopted,which was composed of elastic design calculation and elastic-plastic response estimation for both fortified and rare levels of earthquake excitations.In the elastic stage,the quantitative relationship between post-earthquake functional recovery demand and seismic resilience capability established by the IDR spectra was used to conduct parametric calculations.Then response estimation was carried out to verify the displacement and IDR in the elastic-plastic stage.The probabilistic performance assessment considering residual displacement shows that the dual-systems designed according to the proposed method can effectively achieve the design goals under the two-level earthquakes.Compared with the uncontrolled structure,the dual-systems,not only achieve a 50％and 60％decrease in the average IDR under the two-level earthquakes,but also effectively controls the residual deformation and damage distribution under the incremental earthquakes.
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