屈曲约束支撑-钢筋混凝土框架结构抗震韧性评价方法与震后修复策略研究OA北大核心

The repair strategy of seismic-damaged structures has a significant effect on the rapid recovery of the functionality of post-earthquake buildings.To provide a quantitative evaluation criterion for the optimization of post-earthquake repair strategy,two assessment indices,the level of structural performance recovery and the skew of the recovery trajectory index were introduced,and a seismic resilience assessment model that can comprehensively consider the structural performance recovery level and the repair efficiency was proposed.Based on the birth-death element technology,a numerical post-earthquake repair approach for seismic-damaged structures considering the actual repair conditions was proposed.Moreover,a complete seismic resilience assessment framework was constructed.The repair strategy was determined by taking the structural story as an operating unit.Through seismic resilience assessment of a buckling-restrained braced reinforced concrete frame,the redistribution of structural internal forces in the repair process was investigated,and the structural recovery effectiveness under different repair strategies was compared.The results show that,the proposed seismic resilience assessment model can effectively quantify the structural performance recovery level and the repair efficiency under different repair strategies.The strategy of gradual repair for components and the installation of temporary supports can effectively mitigate the disturbance of structural internal forces,and also reduce the risk of structural new damage caused by the internal force redistribution due to the repair of components.The structural seismic performance can be basically restored to the original level using the adopted recovery strategies,and the down-to-up(from the first story upwards)repair strategy exhibits the highest repair efficiency.