Experimental investigation and analytical modelling of shear strength of thin walled textile-reinforced UHPC beams

• Published in: Engineering structures Vol. 231; p. 111735
• Main Authors: Preinstorfer, Philipp, Huber, Patrick, Huber, Tobias, Kromoser, Benjamin, Kollegger, Johann
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 15.03.2021; Elsevier BV
• Subjects: Acrylonitrile; Addition polymerization; Carbon; Carbon fiber reinforced plastics; Carbon textile reinforcement; Carbon-epoxy composites; Carrying capacity; CFRP rods; Concrete; Copolymers; Epoxy resins; Fiber reinforced polymers; Impregnation; Polymers; Prestressing; Reinforcement; Shear strength; Structural engineering; Structural members; Styrene; T beams; T-beam; Textile composites; UHPC; Ultra high performance concrete; Shear strength; UHPC; Carbon textile reinforcement; CFRP rods; T-beam
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2020.111735

•• Shear capacity of TRC might be reduced due to a spalling of the concrete cover.•• Prestressing is an efficient way to improve the shear carrying capacity of TRC.•• Efficiency factors account for the textile stress transmitted via the shear crack. The combination of two high performance materials, ultra-high performance concrete and carbon reinforcement, allows for the construction of efficient, durable thin-walled structural elements. In order to investigate the shear behaviour of such elements a test series on thin-webbed textile reinforced T-beams was planned and carried out at the Institute of Structural Engineering at TU Wien. In the experiments the efficiency of carbon textile reinforcement grids with different impregnation materials used as shear reinforcement was analysed. Furthermore, the shear span to effective depth ratio as well as the effect of prestressing on the shear carrying capacity was investigated. This article describes the experimental programme and shows the test results. The evaluation of the results indicates a higher shear performance of beams with lower-tex sand coated, acrylonitrile-styrene-acrylate copolymers impregnated textile fabrics than with Heavy-Tow grids with an epoxy resin impregnation. For the case of prestressing the carbon fibre reinforced polymer an additional increase of the shear carrying capacity of the thin-walled carbon textile reinforced structures was verified.