PSI - Issue 68

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Maha Assad et al. / Procedia Structural Integrity 68 (2025) 252–258 M. Assad et al./ Structural Integrity Procedia 00 (2025) 000–000

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(c) (d) Fig. 4: Results: (a) Load-deflection curves; (b) Percentage increase in load compared to UA; (c) Load-strain curves; (d) Percentage of strain utilization 4. Summary and Conclusions This paper presented the results of an experimental investigation on the effect of CFRP spike anchor’s insertion angle on the behavior of externally strengthened and end-anchored RC beams. The performance of the beams was analyzed in terms of behavior at failure, load-deflection curves, and strain in the CFRP laminates. The following conclusions can be deduced from this study: • The use of CFRP anchors at a vertical dowel angle delayed the delamination and improved the behavior of the beams at failure. Second point • The failure observed in specimens having inclined anchors was unfavorable. An abrupt separation in the concrete cover occurred that was even more brittle than the unanchored beam. • Using an inclined dowel angle in the anchored beams did not enhance the flexural capacity. In fact, the flexural capacity was even less than the unanchored beam. • Drilling inclined holes for large-diameter anchors in flexure is impractical since there is a high chance that the drill will be obstructed by a steel bar or a steel stirrup. Therefore, it is not recommended to use inclined anchors in strengthened RC beams for flexure.