Post-installed anchors in concrete strengthened by post-installed reinforcement under tensile load

Abstract

This research discusses post-installed anchors strengthened by post-installed reinforcement (PRs) under tensile loading. Both types of adhesive and expansion anchors were tested under tensile loading. The PRs are reinforcing bars that were installed in a vertical and an inclined direction around a single anchor, as different samples separately. In general, the results showed that the PRs in the vertical direction were more effective than those in the inclined direction. It was found that the tensile capacity of the adhesive anchors significantly improved using the PRs. Although, no major enhancement was recorded in the tensile capacity of the expansion anchors. For both types of anchors, the PRs prevented severe concrete breakout failure. Moreover, with the PRs, a higher ductile behavior was observed at both types of anchors. Employing PRs could be a feasible and practical method to strengthen anchorage systems in concrete and prevent severe damages in concrete substrates.

Keywords:

• Adhesive anchors
• concrete breakout failure
• expansion anchors
• post-installed anchors
• post-installed reinforcement
• tensile capacity

Acknowledgments

The first author would like to also acknowledge Petchra pracha Jom Klao Ph.D. research scholarship that allows him to pursue his Ph.D. at KMUTT.

Additional information

Funding

This research work was supported by the Institutional Research Capability Development Grant (no. IRG5980002) from Thailand Research Fund (TRF), King Mongkut’s University of Technology Thonburi (KMUTT. The technical assistance and supply of anchors from Hilti (Thailand) Company Limited is much appreciated.