Abstract
Abstract An experimental work on reinforced concrete (RC) rectangular beams strengthened in shear with textile reinforced mortar (TRM) jackets is presented in this paper, with focus on the following investigated parameters: (a) the amount of external TRM reinforcement ratio, ρf, by means of using different number of textile layers and different types of textile fibre materials (carbon, glass, basalt); (b) the textile geometry, and (c) the shear span-to-depth ratio, a/d. In total, 22 tests were conducted on simply supported rectangular RC beams under (three-point bending) monotonic loading. The experimental results revealed that: (1) TRM is very effective when the failure is attributed to debonding of the TRM jacket from the concrete substrate; (2) the trend of effective strains for carbon, glass and basalt TRM jackets is descending for increasing values of the TRM reinforcement ratio, ρf, when failure is associated to debonding of the jacket; (3) the effect of textile geometry is significant only for low values of ρf, resulting in variances in the capacity enhancement and the failure modes, and (4) the shear span-to-depth ratio has practically no effect to the failure mode nor to the TRM jacket contribution to the total shear resistance of the RC beams.
Highlights
Introduction and backgroundOver the last decades, there is an increasing need to upgrade many of the existing reinforced concrete (RC) structures both in seismic and non-seismic areas mainly due to their ageing, lack of maintenance, deterioration, and environmental induced degradation.A composite material called textile-reinforced mortar (TRM) has been introduced since last decade, for structural strengthening of existing structures [1,2]
For this type of failure the trend of the experimental εeff values for TRM jackets is descending for increasing ρf Ef_TRM values, which is in agreement with the typical behaviour of fiber-reinforced polymers (FRP) jackets
In this paper the effectiveness of U-shaped TRM jackets for strengthening in shear rectangular concrete beams was experimentally investigated, including the following parameters: the amount of external TRM reinforcement ratio using three different textile materials, the textile geometry and the shear spanto-depth ratio (a/d) in RC rectangular beams strengthened in shear with U-shaped TRM jackets
Summary
A composite material called textile-reinforced mortar (TRM) has been introduced since last decade, for structural strengthening of existing structures [1,2]. TRM is a low-cost, resistant at high temperature [4,5,6], compatible to masonry or concrete substrates and friendly for manual workers material, which can be applied at low temperatures or on wet surfaces. The use of TRM is becoming more attractive for the retrofitting of existing concrete or masonry structures than fiber-reinforced polymers (FRP) which have been widely used but haves some drawbacks (i.e. high prices, inapplicability at low temperatures or wet surfaces, combustibility that could boost fire spreading and generally very poor performance at high temperature) due to the epoxy resins used in these composites. A variety of studies on TRM have been published the last year (2017), indicating that TRM is on the spotlight of recent research [28,29,30,31,32,33,34,35,36,37,38,39,40,41]
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