Theoretical Analysis And Experiment Research On Interface Performance Of Steel Bending Beams Retrofitting With CFRP

Retrofitted steel structure with carbon fiber reinforced polymer sheet became more and more popular in steel structure retrofitting. Compare with the traditional method of retrofit, retrofitting steel structure with FRP sheet has many outstanding advantages. Currently the research and application on retrofitting concrete structure with CFRP is relatively mature, but the steel structure with CFRP retrofitting still have many issues yet to be research. This paper have a more systematic theoretical analysis and experimental research on one of the most common steel components——bending beams retrofitting with CFRP sheet. As follows:Because of great difference between retrofitting steel structure and reinforced concrete structure with CFRP, the paper has a elaborate discuss on the steel structure retrofitting with CFRP, including the bonding mechanism, the factors affecting bonding, the work principle of CFRP retrofit steel structure and potential failure mode of steel structure retrofitting with CFRP material.Analysis of interface stress axial tensile steel component with CFRP retrofitting;Deduce the formula of sheer stress and peel off stress to guide the following experiments.Then we do appropriate experiments to observe the phenomena and get the changes of stress and deflection. The experiment includes two parts, one is steel beam retrofitting with one or three pieces of carbon fiber sheet, the other is steel beam retrofitting with carbon fiber plate.Through experiment research and analysis get a number of conclusions and recommendations for development and improvement of retrofitting steel structure with CFRP has an important reference value.