Study On Seismic Behavior Of Reinforced Concrete Frame Structure Strengthened With Steel Encasement

In recent years,with the increase of the frequency of earthquake action,the damage and destruction of building structures are increasing.But for the repairable buildings,it is more economical to reinforce and repair them than to rebuild them.As a result,the industry of building reinforcement is developing rapidly,and the types and methods of structural reinforcement are increasing.Among them,the method of encased steel reinforcement is simple in structure,flexible in layout and reasonable in economy It has become an important object of technology and scientific research in engineering practice.In view of the existing researches on the reinforcement method of steel encasement are mostly focused on the structural material and component level,and the nonlinear research theory of the damaged structure as a whole is still in the exploration stage,this paper takes the damage degree of the reinforced concrete frame structure in the earthquake as the variable,evaluates the impact of the reinforcement method of steel Encasement on the overall seismic performance of the structure,and analyzes the structure through the comparison before and after the reinforcement Seismic vulnerability of structures.The main work of this paper is as follows:This paper discusses the restraint effect of steel encasement reinforcement on concrete members,determines the constitutive relationship of materials,selects the appropriate damage model,establishes the seismic damage reinforced concrete frame model through the material degradation coefficient of the structure,conducts pushover analysis on the structure model,studies the bearing capacity,dynamic characteristics and elastic-plastic deformation of the whole structure under different seismic actions,and compares different damaged structures According to the results of base shear,story displacement,story displacement angle and plastic hinge,the strengthening effect and seismic performance of the structure are analyzed.This paper analyzes the influence of steel encasement reinforcement on structural performance,studies the change of seismic performance of damaged structures before and after reinforcement by using incremental dynamic analysis,selects appropriate seismic wave,analyzes the overall collapse resistance and collapse safety reserve of structures by using IDA curve cluster,optimizes the selection of engineering demand parameters,and evaluates the vulnerability of steel encasement reinforcement to the ultimate state of earthquake damaged concrete frame structures Degree of impact.