Transmission of prestressing force to concrete by bonded fiber reinforced plastic (FRP) tendons made of braided epoxy-impregnated aramid fiber was examined by experiment in this project. Beams 4.0 m (13.1 ft) in length and 12 × 21 cm (4.7 × 8.3 in.) in cross section were fabricated using different tendon size and number, surface condition (adhered sand), and initial prestressing force. The test consisted of the nondestructive measurement of the strain variation in the tendons (by strain gages) and in concrete (by contact points) at both ends of each beam before, during, and after tendon release. Transfer length is mainly affected by adhered sand on tendon surface and tendon size. Friction resulting from the wedge effect is the principal component of the transfer bond stress. Results showed significant differences with the case of conventional seven-wire steel strand. Recommendations are made for values of transfer length to be used in field applications.
|Original language||English (US)|
|Number of pages||10|
|Journal||ACI Structural Journal|
|State||Published - May 1 1992|
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction