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Flexural-strengthening efficiency of CFRP sheets in post-tensioned concrete T-beams with and without U-strip CFRP anchorage system
This paper deals with flexural-strengthening efficiency of CFRP sheets for post-tensioned concrete T-beams with and without external U-strip CFRP anchorage systems. An experimental program was carried out on total nine post-tensioned concrete T-beams in practical sizes. The numbers of CFRP layers used to strengthen the beams are 0, 2, 4and 6 layers, respectively. Two external U-strip CFRP anchorage systems were investigated in this study, including uniformly and non-uniformly distributed systems. The test results showed that the U-wrap CFRP anchorage improved significantly the deformation capacity and ductility of the beams as compared to that of the control beam (up to 65%). The U-wrap CFRP non-uniformly distributed anchorage, which is more effective than the uniformly distributed one in a sense of increasing deformation capacity of thebeams, caused strain distribution in the flexural-strengthening CFRP sheets to be more uniformly, and prevented debonding of CFRP sheets more effectively. Furthermore, this anchorage system is proved to be able to adjust the interaction between the flexural-strengthening CFRP sheets and prestressed cables as well as improve working efficiency of the cables. Moreover, the CFRP sheets also increase considerably flexural capacity, reduce crack width in the beams. The average values of strains in the CFRP jackets measured at failure of beams is approximately 27% and 66.7% of the ultimate tensile strains of CFF epoxy composites.
Flexural-strengthening efficiency of CFRP sheets in post-tensioned concrete T-beams with and without U-strip CFRP anchorage system
This paper deals with flexural-strengthening efficiency of CFRP sheets for post-tensioned concrete T-beams with and without external U-strip CFRP anchorage systems. An experimental program was carried out on total nine post-tensioned concrete T-beams in practical sizes. The numbers of CFRP layers used to strengthen the beams are 0, 2, 4and 6 layers, respectively. Two external U-strip CFRP anchorage systems were investigated in this study, including uniformly and non-uniformly distributed systems. The test results showed that the U-wrap CFRP anchorage improved significantly the deformation capacity and ductility of the beams as compared to that of the control beam (up to 65%). The U-wrap CFRP non-uniformly distributed anchorage, which is more effective than the uniformly distributed one in a sense of increasing deformation capacity of thebeams, caused strain distribution in the flexural-strengthening CFRP sheets to be more uniformly, and prevented debonding of CFRP sheets more effectively. Furthermore, this anchorage system is proved to be able to adjust the interaction between the flexural-strengthening CFRP sheets and prestressed cables as well as improve working efficiency of the cables. Moreover, the CFRP sheets also increase considerably flexural capacity, reduce crack width in the beams. The average values of strains in the CFRP jackets measured at failure of beams is approximately 27% and 66.7% of the ultimate tensile strains of CFF epoxy composites.
Flexural-strengthening efficiency of CFRP sheets in post-tensioned concrete T-beams with and without U-strip CFRP anchorage system
Phan Vũ Phương (author) / Trương Thị Phương Quỳnh (author) / Đặng Đăng Tùng (author) / Nguyễn Minh Long (author)
2016
Article (Journal)
Electronic Resource
Unknown
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