Experimental Study on Mechanical Behavior of Concrete Loading along Path (Constant Stress, Constant Strain, Increasing Strain)

Abstract:

Triaxial compressive experiments were performed with normal concrete by using the large triaxial test system. The loading process was divided into two stages: (1) Under the condition of keeping the three axial stresses equivalent, the compressive stress was increased to a specified value p, which was maintained for a period of time; (2) The strain in y direction was increased monotonously while the stress in x direction and the strain in z direction both remained constant. In this paper, the study on the experiments indicates: the minimum principal stress significantly influences the strength of concrete, i.e., the greater the minimum principal stress is, the greater the concrete strength is; the stress in y direction where the strain stayed constant is the middle principal stress; the constant strain influences the relationship between σ₂ and σ₁, they reach the peak values at the same time and approximate to linear relationships in much parts of their descending stage, curvature only appears at their ends; When ε13>8, each relationship curve of τ₁₃-γ₁₃ gradually becomes horizontal；Below a line AB in figure of coordinate system ε_x, ε_y the curves of ε_x-ε_y approximately parallel to each other; If the minimum principal stress is 15MPa or 20MPa, After εkk reaches the peak point, the volume gradually becomes stable after a transient decrease stage.

• Periodical: Applied Mechanics and Materials (Volume 238)
• Pages: 91-95
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.238.91
• Online since: November 2012
• Authors: Zhe Wang, Jing Li, Ren Jie Shang
• Keywords: Constant Stress, Normal Concrete, Strain, Strength

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