Experiment Study And Simulation Analysis Of Bending Resistance Of IFRP Strengthened RC Continuous Beams

Igneous fiber reinforced polymer(abbr. IFRP) is a kind of inorganic fiber material. Its mechanical property is quite good and it is cheaper than other fiber cloth, with a higher performance-price ratio.Nowadays, the research results of IFRP strengthened RC continuous beams are relatively few, especially the reinforcement performance of secondary loading. Based on the experimental research, theoretical derivation and numerical simulation, the bending resistance of IFRP strengthened RC continuous beams under secondary loading is studied in this paper. The main work and conclusions of this paper are listed as follows:(1) The experiment scheme of different loading-history of IFRP strengthened RC continuous beams are designed and finished. Based on the experimental results, the influence of secondary loading on bearing capacity of bending resistance as well as damage forms and influence factors of IFRP strengthened RC continuous beams are analyzed. The reinforced effects of IFRP reinforced RC continuous beams and CFRPreinforced RC continuous beams are studied.(2) On the basis of the existing researches and the experimental results above, theoretical analyses of the bearing capacity of IFRP reinforced RC continuous beams and the influence of secondary loading histories on the strengthening effects are carried out. According to the influence of hysteretic strain of IFRP and the damage forms of concrete on strengthening effects, the existing theoretical calculation model has been improved.(3) A Finite element model of IFRP reinforced RC continuous beams is built using ABAQUS with the concrete damage plastic model as the constitutive model, and the whole process of loading-unloading and failure of IFRP reinforced RC continuous beams are stimulated and analyzed. A comparison has been made among the simulation results, theoretical results and experimental results to evaluate the effectiveness of the simulation analysis model for the flexural capacity of IFRP strengthened RC continuous beams.(4) According to the method of value engineering, the performance-price ratio of IFRP reinforced components of different stressing states has been analyzed.