Comparative Study On The Comprehensive Effect Of CFRP Cloth And Combined Reinforcement Method On RC Frame Structures

Reinforced concrete is widely used in industrial and civil buildings in earthquake areas of China because of its good integrity.However,due to unreasonable design,improper use,disrepair and other reasons,as well as the continuous updating of architectural design specifications,the bearing capacity of many reinforced concrete structures cannot meet the requirements,and the seismic performance cannot meet the requirements of the existing seismic specifications.Strengthening reinforced concrete structures to improve their seismic performance is an efficient and economical method,and it is also one of the research hotspots in the field of structural engineering at home and abroad.In this paper,the comprehensive performance of reinforced concrete frame structure before and after reinforcement is compared with an engineering example,which has important practical significance.In this paper,the research and application status of carbon fiber sheet reinforced method and reinforced concrete column reinforced by increasing section method are briefly described.The performance research and PUSHOVER analysis method of CFRP reinforced concrete members and reinforced concrete columns with larger column sections are introduced in detail.The method of CFRP cloth reinforcement and the combined method of CFRP cloth and increased section reinforcement are respectively used to reinforce the design of a frame concrete frame structure with a design error.By means of PKPM software and SAP2000 software,the structure before and after reinforcement are modeled and analyzed.The effectiveness of the model is verified by each other,and the static performance and overall seismic performance of the structure before and after reinforcement are obtained.Finally,the comprehensive properties of the structure before and after reinforcement are compared and analyzed.The results show that:1.Both CFRP cloth reinforcement and composite reinforcement can improve the ductility of the structure,CFRP cloth reinforcement can be improved by about 9.7%,combined reinforcement can be improved by about 15.7%.2.The maximum displacement of CFRP cloth is 1.1%less than that before the reinforcement when the CFRP cloth is pasted under the state of rare earthquake action point.The maximum displacement of composite reinforcement was 4.6%less than that before reinforcement.3.After CFRP cloth is pasted to reinforce the structure,the natural vibration period of the first three orders of the structure does not change much.Compared with that before the reinforcement,the natural vibration period of the first three orders of the structure after composite reinforcement decreases slightly,with the maximum decrease of about 4%.4.Through comparative analysis,this project chooses CFRP cloth as the better reinforcement scheme.