The Pushover Analysis Of Damage Concrete Frame Seismic Strengthening

In recent years, seismic strengthening of the damage reinforced concrete frame has been paid more and more attention. Structure of different types of damage and the degree of injury will directly affect the determination of the strengthening plan and the seismic performance. The researches for reinforced concrete beams, columns and node components have been more, but for integral damage reinforced concrete frame seismic strengthening research is relatively less. Combining with the Henan province key science and technology project (132102310277), the pushover analysis of the overall damage frame structure using different reinforcement were studied which were based on the reinforced concrete frame under the action of earthquake simulation test and finite element analysis, mainly in research as follows:Based on the research of reinforced concrete frame structure in horizontal low cyclic loading experiment, establishing the finite element pushover analysis model, the yield load, yield displacement, ultimate load and ultimate displacement of reinforced concrete frame and concrete frame by CFRP strengthening were obtained. The results were basically consistent with the experimental values. Based this model, the finite element analysis models of the strengthened reinforced concrete frame structure by angle iron and steel braces were established. The Pushover analysis of the models were done, and the seismic performance of the strengthened concrete frame structure were analyzed.Then, the finite element analysis models of the reinforced concrete frame structure were established by defining of reinforced concrete frame stiffness reduction factor. The Pushover analyses of the models strengthened by CFRP sheets, angle iron and steel braces were calculated. The affects of injury and strengthening plans for the seismic behavior of strengthening concrete frame are analyzed.At last, on the basis of the single layer and single span reinforced concrete frame structure’s research, some three-layer and three-span reinforced concrete frame models are established by the finite element analysis software. Through the pushover analysis, we can get the seismic performance of the reinforced concrete frame strengthened by CFRP sheets, angle iron or steel support. According to the characteristics of different methods of reinforcement, the sequence of concrete frame beam end and column end plastic hinges and the status of plastic hinges ultimately achieve, I put forward the combination reinforcement of overall reinforcement and local member reinforcement. Establishing the finite element pushover analysis model of combination reinforcement, the Pushover analysis of the models was done. According to the confrontation between the combination reinforcement method and the Single reinforcement method, the advantages of damage reinforced concrete frame strengthened by combination reinforcement method were reached.