Studies On Design Theory For Concrete Beams Reinforced With FRP Rebars

Deterioration of reinforced concrete structures has become a serious problem in last decades, this situation is due mainly to corrosion of reinforcing bars embedded in concrete. A long-term and effective way to solve this problem is to use Fiber Reinforced Polymer (FRP) reinforcing bars for alternative. Since 1970s, many researches have been conducted on FRP reinforced concrete structures, however, limited investigations have been carried out in our country. In this situation, it is very meaningful to study design theories and methods of FRP reinforced concrete structures.The works presented in this paper can be divided into four parts:Part 1 48 pull-out specimens and 18 beam specimens are tested to study the bond and anchor behavior of GFRP rebars, including failure modes, bond strength, development length and bond-slip relationship. Experiments and analysis show that, the bond strength is influenced by type of specimens, diameter of bars, embedment length and so on. Based on the test results and former works, a new equation for bond strength and development length of GFRP rebars is proposed in this paper, which takes types of GFRP bars, strength of concrete, diameter of GFRP bars and embedment length in to consideration. In addition, a model for bond-slip relationship is also proposed.Comparison between analytical and experiment results shows that, analytical results of bond strength of GFRP rebars is very close to that of the experimental results. Studies also show that the bond-slip relationship model could reflects the bond behavior of GFRP rebars well.Part 2 A nonlinear full-range analysis for concrete beams reinforced with FRP bars by using ANSYS is conducted in this paper. The analytical results are proved to show good agreement with the test results, making it reliable for full-range analysis on 38 specimens.Part 3 A systematical study on the design theory of concrete beams reinforced...