Abstract
This paper presents a study on the effectiveness of TRM jacketing in shear strengthening of full-scale reinforced concrete (RC) T-beams focussing on the behaviour of a novel end-anchorage system comprising textile-based anchors. The parameters examined in this study include: (a) the use of textile-based anchors as end-anchorage system of TRM U-jackets; (b) the number of TRM layers; (c) the textile properties (material, geometry); and (d) the strengthening system, namely textile-reinforced mortar (TRM) jacketing and fibre-reinforced polymer (FRP) jacketing for the case without anchors. In total, 11 full-scale RC T-beams were constructed and tested as simply supported in three-point bending. The results showed that: (a) The use of textile-based anchors increases dramatically the effectiveness of TRM U-jackets; (b) increasing the number of layers in non-anchored jackets results in an almost proportional increase of the shear capacity, whereas the failure mode is altered; (c) the use of different textile geometries with the same reinforcement ratio in non-anchored jackets result in practically equal capacity increase; (d) TRM jackets can be as effective as FRP jackets in increasing the shear capacity of full-scale RC T-beams. Finally, a simple design model is proposed to calculate the contribution of anchored TRM jackets to the shear capacity of RC T-beams.
Highlights
Introduction and backgroundThe issue of upgrading existing structures has been of great importance over the last decades due to their deterioration; ageing, environmental induced degradation, lack of maintenance or need to meet the current design requirements
This paper presents a study on the effectiveness of textile-reinforced mortar (TRM) jacketing in shear strengthening of full-scale reinforced concrete (RC) T-beams focussing on the behaviour of a novel end-anchorage system comprising textile-based anchors
The results showed that: (a) The use of textile-based anchors increases dramatically the effectiveness of TRM U-jackets; (b) increasing the number of layers in non-anchored jackets results in an almost proportional increase of the shear capacity, whereas the failure mode is altered; (c) the use of different textile geometries with the same reinforcement ratio in non-anchored jackets result in practically equal capacity increase; (d) TRM jackets can be as effective as fibre-reinforced polymers (FRPs) jackets in increasing the shear capacity of full-scale RC T-beams
Summary
Introduction and backgroundThe issue of upgrading existing structures has been of great importance over the last decades due to their deterioration; ageing, environmental induced degradation, lack of maintenance or need to meet the current design requirements. Replacing the deficient concrete structures in the near future with new is not a viable option as it would be prohibitively expensive. TRM is a low cost, friendly for manual workers, fire resistant, and compatible to concrete and masonry substrates material which can be applied on wet surfaces or at low temperatures. For all these reasons, using TRM will progressively become more attractive for the strengthening of existing concrete and masonry structures than the widely used fibre-reinforced polymers (FRPs). TRM system has been investigated as strengthening system of reinforced concrete (RC) elements [1e9] or structures [10] and has been found to be a very promising solution
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