Abstract
Efforts are being made to use FRP (fiber-reinforced polymer) for reinforcements instead of traditional construction materials like steel owing to its remarkable mechanical properties. Among them, this study developed a CFRP tendon to be used as near-surface-mounted reinforcement together with a dedicated prestressing system and investigates experimentally the strengthening effect considering various variables including the amount of reinforcement, the bond performance, and the strength and damage ratio of the concrete. The test results reveal that one line of reinforcement improved the strengthening performance by about 55% and two lines by 96% and that the bonding of the CFRP tendon enhanced the strengthening performance by 15%. Higher strength and damage of the concrete seem to have a poor effect on the overall strengthening performance. However, the use of CFRP tendon with bond performance higher than 11 MPa, filler, and anchorage system appears to promote stable strengthening behavior.
Highlights
Owing to its remarkable mechanical properties, FRP was first adopted by the aerospace industry and is today extensively applied from the sport industry to the manufacturing of automobile parts or as construction material
Its application enables to improve the serviceability as well as to exploit efficiently the FRP tendon. This method requires a special anchor different from that used in prestressed concrete (PSC) structures to embed the tensioned FRP tendon in the concrete surface. e anchor for prestressed near-surface-mounted reinforcement (NSMR) can be classified into indirect and direct methods with respect to the way in which the tensioning frame is installed. e indirect method resembles the pre-tensioning of PSC structures and uses a separate reaction frame for tensioning the FRP tendon
For the prestressed NSMR, this study developed a practical prestressing system and a swaged-type anchor enabling to exploit more than 60% of the tensile strength of the CFRP tendon. e loading test is conducted to examine the strengthening performance of the developed method considering diversified variables, and the experimental results are validated analytically
Summary
Owing to its remarkable mechanical properties, FRP (fiberreinforced polymer) was first adopted by the aerospace industry and is today extensively applied from the sport industry to the manufacturing of automobile parts or as construction material. Its application enables to improve the serviceability as well as to exploit efficiently the FRP tendon This method requires a special anchor different from that used in prestressed concrete (PSC) structures to embed the tensioned FRP tendon in the concrete surface. For the prestressed NSMR, this study developed a practical prestressing system and a swaged-type anchor enabling to exploit more than 60% of the tensile strength of the CFRP tendon. 2. CFRP Tendon e commercialized FRP tendons are fabricated mainly by fiber manufacturers or companies that formerly supplied steel strands. Compared to the CFRP tendons, the AFRP tendons develop similar or higher rupture strain but lower tensile strength and elastic modulus and rather unfavorable relaxation characteristics.
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