Model investigation of CFRP reinforcement behavior on beams and columns of highrise reinforced concrete buildings

Keywords: Performance, period, flexibility, strength, CFRP, steel bar, beam and column The recent earthquakes, fires and natural disasters show that existing structures are not safe against these types of problems and shows their further development against these disasters. For this reason, in order to minimize the loss of life and property, it is necessary to strengthen many endangered structures in a short time or to use new materials and methods. Therefore, effective and fast applicable methods are needed. In addition, due to corrosion of steel in reinforced concrete buildings, it causes the reinforced concrete elements strength loss due to the loss of mass after a certain period of time. Therefore, a new material that can be used instead of steel was needed. Purpose of using CRFP; To minimize the loss of life and property of existing buildings during and after the earthquake, taking into account the magnitude of the disaster that will occur. In this study, it is aimed to model an 18-storey commercial building as CFRP and steel reinforcement using the SAP2000 program and to examine the differences between them. Critical situations of the models are examined by defining different beam-column sections and load combinations. According to the results, the model using CFRP requires 10% less reinforcement than steel reinforcement as cross-sectional area. However, 10% reduction in beam dimensions and 5% reduction in column dimensions were observed. Since the size reduction of CRFP is not much compared to steel, it does not show much importance. The strength of CRFP reinforcement is higher than steel reinforcement. But since CRFP has no yield strength, it continues to change shape until tensile stress and ruptures for a moment. It will cause the building to collapse as a result of the sudden rupture of the CRFP. It is one of the issues that should be considered before designing. However, it has been calculated that the CFRP mass weight is reduced by 20% in the building compared to steel reinforcement.