TEXTILE REINFORCED CONCRETE UNDER BIAXIAL LOADING

摘要

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 (IMB) 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. In this paper the tests and their results are presented.