Abstract
In this paper, experimental investigations for strengthening reinforced concrete (RC) continuous beams were performed. Eighteen T-beams were cast, twelve of which were inverted T-beams where the flange portion of the T-beam was subjected to positive flexure to represent the support region of a continuous beam. Six of the T-beams were non-inverted where the web is subjected to positive flexure. Carbon fiber reinforced polymer (CFRP) sheets with different widths were considered, and different strengthening configurations with the same area of CFRP were investigated. The use of one-layer, multiple layers, or multiple strips of CFRP were evaluated to investigate the effect of these configurations on the ultimate capacity and ductility of the strengthened beams. From the experimental observation of the non-inverted beams, it was found that the ultimate load capacities of the CFRP-strengthened beams were enhanced by 4% to 90% compared to the control beam. Using multiple layers of CFRP sheets enhanced the stiffness of the beams by 4% to 46%, depending on the CFRP area and configurations. The debonding of CFRP before the ultimate failure provided additional ductility to the tested beams. For the strengthening of the inverted beams, it was found that the addition of CFRP strips did not increase the strength of the beams when the width of CFRP to beam width ratio was less than 0.25, but the ductility of the beam was enhanced slightly. The use of multiple strips was found to be a more effective way for the strengthening of the negative moment region than using multiple layers. This can also provide more desirable modes of failure than when applying CFRP in multiple layers. Ductility was found to be lower if multiple layers were used compared to other configurations. Moreover, it was observed that as the compressive strength of concrete increased the addition of the CFRP improved the beams ductility.
Highlights
Bonded carbon fiber reinforced polymer (CFRP) sheets are considered as an effective technique for strengthening and repairing reinforced concrete (RC) beams [1,2]
The ultimate load capacities of the CFRP-strengthened beams were enhanced by 4% to 90% compared to the control beam
The use of one-layer, multiple layers, or multiple strips was evaluated to investigate the effect of these configurations on the ultimate capacity and ductility of the strengthened beams
Summary
Bonded carbon fiber reinforced polymer (CFRP) sheets are considered as an effective technique for strengthening and repairing reinforced concrete (RC) beams [1,2]. Akbarzadeh et al [14] studied the experimental behavior of six RC continuous two-span beams strengthened with externally bonded FRP sheets at the negative and positive moment regions. It can be concluded from the previous studies that the number, type of strengthening techniques, beams; the effect of using different configurations and widths of the CFRP sheets on the and the length of the CFRP layers impact the strength and ductility of the strengthened continuous response of strengthened continuous RC T-beams in the negative and positive flexural regions has not beams; the effect of using different configurations and widths of the CFRP sheets on the been fully investigated In this theineffect of CFRP configurations, such as the response of strengthened continuous. Of investigated one-layer, multiple layers, or multiple strips, on the ultimate capacity and ductility of the strengthened beams were investigated experimentally
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