Performance evaluation and repair strategy of seismic damages to RC structures based on residual deformation

According to the measured responses to accurately evaluate the seismic damage of structural members can provide suggestions for the repair of damaged structures. In view of the bottleneck problem that the measurable information of structures is limited and the seismic performance of repaired structures is difficult to evaluate, this study established the relationship between the end curvature and the top displacement of members, and discussed the internal relationship of residual displacement, deformation, curvature and damage indexes. From the perspective of energy, a damage evaluation model based on elastic-plastic energy dissipation ratio (EPEDR) is proposed. Considering the deficiency that the repair process is difficult to simulate, a simulation method of damaged structures repair is established. Taken an RC frame structure as an example, selected different damage indexes to quantify the damage of members, and carried out rapid repair analysis according to the damage quantification results and repair strategies. In addition, seismic vulnerability analysis of the repaired damaged structure is performed. The analysis results proved the rapid repair can effectively improve structural performance, and according to residual deformation to guide the repair have the best enhancement effect. Compared with the member-selective repair strategy, the layer-selective repair strategy has a better repair effect.