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Textile reinforced concrete under biaxial loading
The development of textile reinforced concrete is based on the fundamentals of shortcut glass fibre reinforced concrete. In order to increase the effectiveness of the fibres embedded in the concrete matrix, the fibres are aligned in the direction of the tensile stresses similar to ordinary steel reinforced concrete. Biaxial loading on the reinforcement of concrete structures occurs at many locations, for example in the shear area of a profiled beam. Since the fibres are sensitive against action across the longitudinal direction, this has to be taken into account for textile reinforcement. At the edges of shear cracks the fibres are subjected to additional stresses, if the cracks are sloped against the vertical arranged reinforcement and if parallel crack shift occurs. Changing the direction of the fibres at the crack edge causes delamination of the fibres and a transverse force pushing the fibre bundle (roving) against the matrix edge. In order to determine the influence of biaxial stresses acting on the reinforcement, tensile tests were performed at the Institute of Structural Concrete (1MB) of RWTH Aachen University. Thereby, textiles made of alcali resistant glass fibres and carbon fibres have been used. In one test series the orientation of the reinforcement with respect to the load direction has been turned gradually and in another test series a parallel crack shift has been applied to the specimen. Furthermore, first tests on discs made of textile reinforced concrete under biaxial loading have been carried out. The decrease in the load bearing capacity of textile reinforcements under an addititonal transverse loading could be determined in several experimental investigations. Furthermore, the influence of different fibre materials and a lamination of the fabrics has been detected in the tests. The fabrics made out of carbon fibres and the laminated fabric made of AR glass showed a bigger sensitivity against biaxial stresses than the nonlaminated fabrics made out of AR glass. The results of first tests on discs made of textile reinforced concrete showed a positive influence of compression in cross direction on the bearing capacity, whereas tension led to a decrease in load bearing capacity. More investigations are arranged to ensure the first results and to transfer them into design and construction rules.
Textile reinforced concrete under biaxial loading
The development of textile reinforced concrete is based on the fundamentals of shortcut glass fibre reinforced concrete. In order to increase the effectiveness of the fibres embedded in the concrete matrix, the fibres are aligned in the direction of the tensile stresses similar to ordinary steel reinforced concrete. Biaxial loading on the reinforcement of concrete structures occurs at many locations, for example in the shear area of a profiled beam. Since the fibres are sensitive against action across the longitudinal direction, this has to be taken into account for textile reinforcement. At the edges of shear cracks the fibres are subjected to additional stresses, if the cracks are sloped against the vertical arranged reinforcement and if parallel crack shift occurs. Changing the direction of the fibres at the crack edge causes delamination of the fibres and a transverse force pushing the fibre bundle (roving) against the matrix edge. In order to determine the influence of biaxial stresses acting on the reinforcement, tensile tests were performed at the Institute of Structural Concrete (1MB) of RWTH Aachen University. Thereby, textiles made of alcali resistant glass fibres and carbon fibres have been used. In one test series the orientation of the reinforcement with respect to the load direction has been turned gradually and in another test series a parallel crack shift has been applied to the specimen. Furthermore, first tests on discs made of textile reinforced concrete under biaxial loading have been carried out. The decrease in the load bearing capacity of textile reinforcements under an addititonal transverse loading could be determined in several experimental investigations. Furthermore, the influence of different fibre materials and a lamination of the fabrics has been detected in the tests. The fabrics made out of carbon fibres and the laminated fabric made of AR glass showed a bigger sensitivity against biaxial stresses than the nonlaminated fabrics made out of AR glass. The results of first tests on discs made of textile reinforced concrete showed a positive influence of compression in cross direction on the bearing capacity, whereas tension led to a decrease in load bearing capacity. More investigations are arranged to ensure the first results and to transfer them into design and construction rules.
Textile reinforced concrete under biaxial loading
Hegger, Josef (author) / Voss, Stefan (author)
2004
10 Seiten, 9 Bilder, 2 Tabellen, 10 Quellen
Conference paper
English
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