Quantitative Analysis Of Seismic Resilience Of Reinforced Concrete Frames Based On Vulnerability

The seismic resilience of the engineering structure refers to the ability to quickly restore the function of the building,community or lifeline system to the original state through artificial repair or self-repair after the impact of the earthquake.Aseismic resilience is increasingly becoming an indicator for measuring the disaster prevention capabilities of engineering structures,communities and lifeline systems.In this paper,a reinforced concrete frame structure is taken as the research object,the seismic vulnerability curve of the structure is calculated,and the seismic resilience of the reinforced concrete frame is calculated based on the linear,exponential and trigonometric function recovery models.Different functional recovery models resist the impact of seismic resilience.First,the finite element model of the 8-story reinforced concrete frame structure was established using OPENSEES finite element software.The height of the first floor of this 8-layer reinforced concrete frame structure is 4.5m,and the height of the remaining layers is 3.6m.Based on the linear fitting method of probabilistic seismic demand analysis,the seismic vulnerability curves of structures under different performance levels are obtained by fitting the relationship between the structural damage index and the acceleration of seismic dynamic spectrum.After that,through the earthquake engineering loss assessment theory proposed by Mitrani-Reiser,the seismic loss of the structure was obtained.Based on Cimellaro's quantitative calculation method for structural seismic resilience,the seismic resilience calculations were performed for linear,exponential,and trigonometric function recovery models,respectively.Finally,the effects of different functional recovery models on seismic resilience are compared.The comparison results show that with the increase of the ground motion intensity,the seismic loss and recovery time of the structure are gradually increased,and the seismic resilience of the structure is gradually decreased.Under the action of ground motion of the same intensity level,the seismic resilience calculated by the linear and triangular function recovery models is relatively close,and the seismic resilience calculated by the exponential function recovery model is relatively high.The analysis results in this paper can provide a reference for the seismic performance evaluation of reinforced concrete frame structures.