Abstract
The crack propagation process of the cubic concrete specimens containing single cracks under lateral confinement was studied experimentally and numerically. The experimental study was conducted on some pre-cracked cubic specimens under compressive loading condition. Then, the two-dimensional particle flow code (PFC2D) was used to numerically model these specimens considering different lateral applied stresses. Both the experimental test and the numerical modeling showed that the lateral stress has a profound effect on the crack propagation mechanism of concrete compared to that of the uni-axially loaded specimens (containing cracks). In the present work, each specimen contained a single crack so that at the first stage of loading the wing or tensile cracks initiated and extended in the direction of maximum applied load. The mixed mode crack propagation scenarios were observed due to both tensile (wing cracks) and shear (secondary cracks) under different confining stresses. These results are compared with those of the zero confinement cases for both the experimental tests and the numerical models. This comparison exhibited that the confined stress may effectively influence the process of crack initiation and crack propagation in the pre-cracked concrete specimens under compressive loading condition.
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Yavari, M.D., Lazemi, H.A. & Haeri, H. Investigating the Effect of Confining Stress on the Crack Propagation Mechanism of Cubic Concrete Specimens Containing Central Cracks. Iran J Sci Technol Trans Civ Eng 45, 2503–2515 (2021). https://doi.org/10.1007/s40996-020-00573-9
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DOI: https://doi.org/10.1007/s40996-020-00573-9