Abstract
This paper presents an experimental study on shear strengthening of rectangular reinforced concrete (RC) beams with advanced composite materials. Key parameters of this study include: (a) the strengthening system, namely textile-reinforced mortar (TRM) jacketing and fiber-reinforced polymer (FRP) jacketing, (b) the strengthening configuration, namely side-bonding, U-wrapping and full-wrapping, and (c) the number of the strengthening layers. In total, 14 RC beams were constructed and tested under bending loading. One of the beams did not receive any strengthening and served as control beam, eight received TRM jacketing, whereas the rest five received FRP jacketing. It is concluded that the TRM is generally less effective than FRP in increasing the shear capacity of concrete, however the effectiveness depends on both the strengthening configuration and the number of layers. U-wrapping strengthening configuration is much more effective than side-bonding in case of TRM jackets and the effectiveness of TRM jackets increases considerably with increasing the number of layers.
Highlights
Introduction and backgroundStructural retrofitting of existing reinforced concrete (RC) structures is a constantly growing need due to their deterioration
It is concluded that the textile-reinforced mortar (TRM) is generally less effective than fiber reinforced polymers (FRP) in increasing the shear capacity of concrete, the effectiveness depends on both the strengthening configuration and the number of layers
All beams strengthened with Side-Bonded jackets (SB) or U-Wrapped jackets (UW) FRP jackets failed in shear at an ultimate load substantially higher than that of the control beam; confirming the effectiveness of FRP jacketing in shear strengthening of RC members
Summary
Introduction and backgroundStructural retrofitting of existing reinforced concrete (RC) structures is a constantly growing need due to their deterioration (ageing, environmental induced degradation, lack of maintenance, and need for upgrading to meet the current design requirements). The use of fiber reinforced polymers (FRP) as externally bonded (EB) reinforcement in shear strengthening of RC members has become very popular over the last two decades. Following the studies of Triantafillou 1998 [1] and Khalifa et al [2] a big effort was made by researchers worldwide to further investigate or even improve this technique [i.e.3e9]; with all the results showing the high effectiveness of using EB FRP in shear strengthening of RC beams. The FRP strengthening technique has a few drawbacks mainly associated with the use of epoxy resins, namely high cost, poor performance in high temperatures, inability to apply on wet surfaces, as discussed in Ref. Selected case studies of actual applications of TRM in the construction field can be found in ACI guidelines [24]
Published Version
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