不同失效模式下 RC 框架结构抗震韧性评价方法

Different sequences, extents, distributions, and scopes of damage to components result in different seismic failure modes of structures, and directly affect the degree of seismic resilience loss and the speed of recovery. Traditional seismic resilience indexes, based on structure or story level, ignore the component-level characteristics of structure failure modes, thereby failing to establish the internal relationship between structure failure mode and seismic resilience. Consequently, according to the component level that reflects the characteristics of structure failure modes, a structure seismic performance loss model was established using a component damage weighting method. The structure seismic performance and repair time were constantly updated in the process of component repair, and the repair path was determined. Subsequently, a seismic resilience index was proposed, representing the average structure seismic performance during the reconstruction period. The seismic resilience analysis of five failure modes of RC frame structure was carried out. The results show that, with the increase of peak ground acceleration, the decrease in seismic resilience is the slowest for failure modes that beams of upper floors yields earlier than beams of lower floors, while it is most rapid for failure modes occurring within weak layers. Before column damage occurs, there is no significant difference in the performance loss across each failure mode. However, after column damage, substantial differences in performance loss start to appear among the failure modes. Before the structure becomes irreparable, the repair duration is primarily determined by damage to the beams. Repair time for failure modes with relatively concentrated damage is shorter than it for overall failure modes. The strategy of repairing columns before beams can further optimize the structural repair pathway.