Abstract
The paper discusses the results of an experimental investigation carried out on reinforced concrete (RC) beams strengthened in shear by externally bonded fiber reinforced plastic (FRP) sheets. The study is devoted to analyze the role that the transverse steel reinforcement and the beam slenderness ratio could play on the resistant mechanism of RC beams strengthened in shear by FRP composites. The results are summarized and analyzed in detail in the paper in terms of shear capacity, cracking pattern and shear resisting contribution of FRP.
Highlights
The use of composite materials, mainly fiber reinforced polymers (FRP) and, more recently, cement based composite and steel reinforced polymers (SRP), and steel reinforced grout (SRG), in the strengthening of existing reinforced concrete (RC) and masonry structures [1,2,3,4,5,6,7] has become a common technique widely adopted in the past decade
The results emerged from recent experimental studies [16,17,18,19,20,21,22,23,24,25,26,27,28,29] have clearly pointed out that an interaction exists between the resisting mechanisms provided by steel stirrups and FRP
This paper aims at investigating experimentally the effect of the transverse steel and the slenderness ratio on the response of RC beams strengthened in shear by FRP
Summary
The use of composite materials, mainly fiber reinforced polymers (FRP) and, more recently, cement based composite and steel reinforced polymers (SRP), and steel reinforced grout (SRG), in the strengthening of existing RC and masonry structures [1,2,3,4,5,6,7] has become a common technique widely adopted in the past decade. The influence of the transverse steel reinforcement and of the slenderness ratio on the resistance mechanism of RC beams strengthened in shear by FRP is certainly an important issue. This paper aims at investigating experimentally the effect of the transverse steel and the slenderness ratio on the response of RC beams strengthened in shear by FRP. The longitudinal steel reinforcement of the beams was designed in order to assure a shear dominate failure mode It consists of four 22 mm diameter plus two 20 mm diameter steel bars at the bottom, and two 20 mm diameter steel bars at the top of the beam’s section (Fig. 1)
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