考虑残余变形的震损框架结构性能评估及维修优化策略

Performance evaluation and maintenance optimization strategy of seismic damaged frame structure considering residual displacement

针对实际震损结构可测信息有限、修复加固过程难以模拟以及修复加固后结构性能不易评估的现状,建立梁柱构件端部曲率与顶部位移的关系,厘清残余位移、位移、曲率、损伤指数之间的关联,提出在有限元中模拟构件修复加固的方法和流程以及根据不同损伤物理量对构件损伤进行量化的方法。根据不同的损伤物理量以及修复策略对钢筋混凝土震损结构进行快速修复,对修复后的结构抗震性能进行评估并进行地震易损性分析。结果表明:对震损结构进行快速修复能够有效降低结构再遇地震时发生严重破坏和倒塌的风险;在不同的损伤物理量中根据残余位移角量化构件损伤,并指导震损结构快速修复能够最大限度提高结构抗震性能;相对于择件修复策略,择层修复具有更好的效果。

It is very important to quantify the damage degree of the components in the seismic-damaged structure according to the reasonable damage physical quantity,and to guide the rapid repair of the seismic-damaged structure,so as to improve the seismic performance of the structure to meet the use requirements.In view of the fact such as the measurable information of the actual seismic-damaged structure is limited,the damage degree is difficult to quantify,the process of repair and reinforcement is difficult to simulate,and the performance of the structure after repair and reinforcement is difficult to evaluate,the relationship between the end curvature of the beam and column component and the top displacement is established,and the relationship among the residual displacement,displacement,curvature and damage index is clarified.The method and process of simulating the repair and reinforcement of the component in the finite element are proposed.According to the different physical quantity of damage,the method of quantifying the damage of components is proposed.In addition,according to different damage physical quantity and repair strategy,a five-story reinforced concrete seismic-damaged structure is quickly repaired,and the seismic performance of the repaired structure is evaluated,then the seismic vulnerability is analyzed.The results show that the rapid repair of structures damaged by earthquake can effectively reduce the risk of serious damage and collapse in earthquake.The seismic performance of the structure can be maximally improved by quantifying the damage of the component according to the residual displacement drift and guiding the rapid repair of the structure.Among the two strategies of layer selection and part selection,the former has better repair effect.