High-Performance Concrete under Biaxial and Triaxial Loads

Abstract

The basic assumptions and hypotheses construction of the computational model studies, taking into account the peculiarities of the work force imperfections of materials under dynamic loading, based on the phenomenological laws of nonlinear rheology and deformable elastic-creeping body. The values for the coefficient vibrocreep computational model under triaxial stress-strain state on the basis of the hypothesis of central symmetry of the hysteresis loop. The basic phenomenological equations allow the calculation of concrete elements in the conditions of triaxial stress-strain state under dynamic impacts and taking into account the non-linearity of the rheology of deformation.

Numerical study of the biaxial compressive strength of high strength concrete based on a yield design micromechanical approach

“…Finally, the comparison with experimental results taken from literature and related to six high strength concretes shows that the proposed biaxial failure envelope has a similar form to those found experimentally. However, it overestimates in general concrete biaxial compressive strength as shown in Figure .…”

“…Several researchers have studied the biaxial compressive strength of both normal strength (NSC) and high strength concretes (HSC) and found that it depends on concrete composition, on temperature, and on strain rate . The ratio of concrete biaxial compressive strength to its uniaxial compressive strength when the lateral stress is equal to the vertical one, denoted hereafter, λ b 1 , is found to vary between 1.15 and 1.35 as reported by Guo .…”

“…For example, Shang and Ji and Chen and Leung found that the maximal coarse aggregate size, D max , had a positive effect on this ratio λ b 1 ,” whereas Dong et al found that λ b 1 was unaffected by D max . Moreover, some researchers have observed that this ratio decreases when the concrete uniaxial compressive strength increased, but this trend cannot be generalized to all experimental results available in literature since Dong et al, for example, found that λ b 1 was also unaffected by concrete uniaxial compressive strength. In this context, this paper proposes a numerical study of HSC microstructure effects on its biaxial compressive strength.…”

Experimental and nonlinear numerical analysis of underwater housings for the deep sea, made of ultra-high performance concrete

“…The concrete had an average uniaxial compressive strength of 155 MPa after 28 days and the elastic modulus was about 55,000 MPa. To predict the failure more precisely and to study the long‐term behavior, further material properties of this UHPC were studied in multiaxial tests under different stress ratios based on the numerous preparatory work that was done at our institute . The biaxial strength was determined on cubes with 10‐cm edge length in a triaxial testing machine at the Otto‐Mohr‐Laboratory of the Technische Universität, Dresden.…”

Die zweiaxiale dynamische Druckfestigkeit von Beton

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Das Verhalten von Beton unter statischer mehraxialerBelastung ist qualitativ und quantitativ gut bekannt [1][2][3][4][5][6][7]. So zieht eine zweiaxiale Druckbeanspruchung aufgrund des stützenden Querdrucks eine Festigkeitssteigerung nach sich.

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