Optimization Research On Emergency Reinforcement Scheme Of RC Frame Structure After Fire

The fire will not only cause great loss to people's lives and property safety,but also cause serious damage to the building structure itself.In the various types of structures,reinforced concrete frame structure is the most common,after t he fire,the structure itself is likely to have a greater potential for structural safety.In order to ensure the safety of life and property and the safety of the structure,we need to carry out emergency reinforcement of building structure itself,and the emergency reinforcement scheme not only has simple construction process,but also can meet the requirements of the bearing capacity as far as possible on the economic rationality.Therefore,it is of great importance to optimize the emergency reinforceme nt scheme of reinforced concrete frame structure after fire.On the basis of summarizing the previous research results,this paper carries out the research on the optimization of emergency reinforcement scheme and the seismic performance of reinforced concrete structure after fire:(1)Research on the theory of structure test and identification and emergency reinforcement of RC frame structure after fire.We focus on the analysis of determination method for fire temperature and common detection method in the process of fire detection and identification,and summarize the standard for fire detection and rating of structures after fire.On the basis of the above,the paper systematically combs characteristics and scope of application of several common reinforcement methods for RC frame structure,which lays a theoretical foundation for the research of the emergency reinforcement scheme.(2)Research on the optimization model of emergency reinforcement scheme for RC frame structure after fire.On the basis of theoretical research,we built the optimal index system of emergency reinforcement scheme for RC frame structure after fire,and determine its weight by entropy method.In this paper,the traditional TOPSIS method is improved by introducing the weighted generalized Mahalanobis distance theory.Based on the improved TOPSIS method,the optimization model of the emergency reinforcement scheme of RC frame structure after fire is established.(3)Research on the example analysis about optimization model of emergency reinforcement scheme for RC frame structure after fire.Take a comprehensive office building project as an example,we use the reinforcement scheme optimization model of RC frame structure of the improved TOPSIS method based on optimization Analysis o f emergency,and the optimized scheme was analyzed before and after seismic performance using SAP2000 finite e lement analysis software,verify the feasibility and reliability of the optimization model and the reinforcement scheme.