Biaxial Fracture Behaviour of Steel-Span and Steel-Fibre- Reinforced Concrete

Abstract

The wedge splitting method according Tschegg has been used to determine the fracture-mechanical values for cubes (e.g. 150 x 150 x 150 mm 3 ) under uniaxial (tension) and biaxial (compression + orthogonal tension) loading. The steelfibre-reinforced concrete had fibre lengths of 15 to 60 mm and a volume content of 0.5 to 1%. The fracture behaviour and the influence of the fibre length and the fibre content on the fracture parameters can be explained qualitatively using a very simple model. Finally, some aspects relating to the biaxial fracture testing in steelfibre-reinforced concrete which are of interest to engineers are discussed.

Energy dissipation capacity of fibre reinforced concrete under biaxial tension–compression load. Part I: Test equipment and work of fracture

“…Tschegg et al [9] and Elser [10] investigated fracture mechanical properties of different concretes and cement bonded materials under biaxial tensile-compression load and found out that the notch tensile strength and the fracture energy decreases with the application of an additional compression load perpendicular to the acting tensile load. Subsequently, Elser et al [11] and Tschegg [12] investigated different steel and polypropylene fibre reinforced concretes, where a similar decrease of the fracture energy has been observed.…”

“…In previous work, Elser [10], Elser et al [11] and Tschegg [12] reported that the specific dissipated energy of FRC, as a function of the compressive stress ratio, was of a ''wave-like'' shape, but this phenomenon has not been explained as of now. In the work of Elser [10] and Tschegg [12] concrete specimens reinforced with steel fibres of length 60 mm and 30 mm have been studied.…”

“…Tschegg et al [9], Elser [10] and Tschegg [12,17], however, reported that the notch tensile strength dropped by 20% when increasing the compressive stress ratio r 1 /f c from 0% to 10%. For all other higher normalized compression stress ratios the notch tensile strength of both plain concrete and FRC were nearly constant.…”

“…The uniaxial and biaxial Wedge Splitting Test (WST) method developed and patented by Tschegg [13][14][15] has already been extensively described in the literature [10][11][12], thus in this work only a short description will be given. Fig.…”

A gênese e o desenvolvimento do programa de extensão - AFRID - da Faculdade de Educação Física da Universidade Federal de Uberlândia: de 1989 a 2014

“…O erro de medição devido ao atrito entre as peças de transmissão e a cunha é minimizado pelos rolamentos que compõem o equipamento de ensaio e, por isso, é insignificante (menor que 1%). Já a força de divisão (F H ) pode ser determinada por meio de um cálculo simples e a força vertical (F V ) é baixa e não perturba o comportamento da fratura (TSCHEGG, 2009;TSCHEGG;ELSER;STANZL-TSCHEGG, 1995a).…”