Title:
Cyclic Performance of CFRP Strengthened RC Beams in Flexure (Prepublished)
Author(s):
Salman Alshamrani, Fahed Salahat, Hayder A. Rasheed, Griffith Shapack, and Mohammed Albahttiti
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
backbone curve; carbon fiber anchors; flexural members; hysteresis modeling; seismic strengthening
DOI:
10.14359/51744397
Date:
12/6/2024
Abstract:
The behavior of carbon fiber-reinforced polymer (CFRP) flexural strengthened reinforced concrete beams under reversed cyclic loading has not been 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 un-strengthened 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.