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High strength concrete under cyclic tensile loading
In this study, the fatigue behaviour of high strength concrete and normal strength concrete under low-cycle and highcycle tensile loading was investigated in order to describe the failure of these materials on the basis of fracture mechanical conceptions. Deformation controlled uniaxial tensile tests on notched and on dog-bone shaped concrete prisms have been carried out. The experimental results show that with an increasing number of load cycles the uniaxial tensile strength, the fracture energy and the characteristic length of the investigated concretes decrease. Further, for an increasing number of load cycles the corresponding envelope curves differ significantly from the monotonic curve. It can be concluded that the conventional assumption of a unique envelope curve for the fatigue behaviour of concrete is admissible only for low-cycle fatigue loading, but cannot be maintained for high-cycle fatigue loading. This holds true both for normal strength and high strength concrete. For a better understanding of the crack formation and propagation in concrete under cyclic loading an acoustic emission analysis was performed during the tensile tests. Additionally, the condition of the fracture surfaces was studied using projected fringes technique. Based on the gained results, a new material law for the fatigue behaviour of high strength and normal strength concrete was developed by the application of a physically sound rheological statistical approach.
High strength concrete under cyclic tensile loading
In this study, the fatigue behaviour of high strength concrete and normal strength concrete under low-cycle and highcycle tensile loading was investigated in order to describe the failure of these materials on the basis of fracture mechanical conceptions. Deformation controlled uniaxial tensile tests on notched and on dog-bone shaped concrete prisms have been carried out. The experimental results show that with an increasing number of load cycles the uniaxial tensile strength, the fracture energy and the characteristic length of the investigated concretes decrease. Further, for an increasing number of load cycles the corresponding envelope curves differ significantly from the monotonic curve. It can be concluded that the conventional assumption of a unique envelope curve for the fatigue behaviour of concrete is admissible only for low-cycle fatigue loading, but cannot be maintained for high-cycle fatigue loading. This holds true both for normal strength and high strength concrete. For a better understanding of the crack formation and propagation in concrete under cyclic loading an acoustic emission analysis was performed during the tensile tests. Additionally, the condition of the fracture surfaces was studied using projected fringes technique. Based on the gained results, a new material law for the fatigue behaviour of high strength and normal strength concrete was developed by the application of a physically sound rheological statistical approach.
High strength concrete under cyclic tensile loading
Hochfester Beton unter zyklischer Zugbelastung
Kessler-Kramer, C. (author) / Diehl, K. (author) / Mechtcherine, V. (author) / Müller, H.S. (author)
2002
15 Seiten, 8 Bilder, 3 Tabellen, 10 Quellen
Conference paper
English
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