Title:
Cyclic Performance of Carbon Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Beams in Flexure
Author(s):
S. Alshamrani, F. H. Salahat, H. A. Rasheed, G. Shapack, and M. T. Albahttiti
Publication:
Structural Journal
Volume:
122
Issue:
2
Appears on pages(s):
161-174
Keywords:
backbone curve; carbon fiber anchors; flexural members; hysteresis modeling; seismic strengthening
DOI:
10.14359/51744397
Date:
3/1/2025
Abstract:
The behavior of carbon fiber-reinforced polymer (CFRP) flexurally strengthened reinforced concrete (RC) beams under reversed cyclic loading is not sufficiently studied. In this paper, normal-strength concrete is used with a typical steel ratio (0.5%) to build full-scale rectangular beams strengthened on top and bottom with flexural unanchored and anchored CFRP sheets. Five identical beams were examined under fully reversed cycles up to failure following the AC 125 displacement loading protocol. The first beam was tested as an unstrengthened control specimen. The second and third beams were tested as strengthened specimens using thin sheets with and without fiber anchors. On the other hand, the fourth and fifth beams were tested when strengthened using thick sheets with and without fiber anchors. Specimens with thin sheets underwent higher ductility and lower hysteresis pinching relative to the thick ones. The results are comparatively discussed and compared to a phenomenological cyclic analysis model showing promising correspondence.