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实际工程中的混凝土结构大多处于复杂应力状态,本文利用大连理工大学海岸和近海工程国家重点实验室的大型混凝土静、动三轴试验系统,对普通混凝土进行了0(单压)、-0.05、-0.1、-0.15、-0.2、-0.25、∞(单拉)七种比例加载路径的双轴拉压试验,测得了混凝土的抗压强度和抗拉强度,及两个加载方向的应变,并根据试验结果,系统地探讨了混凝土在不同拉压比下的双轴拉压强度和变形特性,发现拉压比对普通混凝土强度和变形性能有明显的影响。建立了考虑拉压比的普通混凝土双轴拉压的破坏准则,与试验值符合较好。经分析得出结论:实际工程中处于双轴拉压应力状态混凝土结构的承载能力低于单轴应力状态的混凝土结构。本文的试验数据及理论分析,丰富了混凝土的多轴强度理论。
Most of the concrete structures in practical engineering are in complex stress state. In this paper, the static and dynamic triaxial test system of large concrete in State Key Laboratory of Coastal and Offshore Engineering of Dalian University of Technology is used to measure the compressive strength of ordinary concrete at 0 (single pressure), -0.05, Biaxial tension and compression tests of seven kinds of proportional loading paths of -0.1, -0.15, -0.2, -0.25, ∞ (single pull) were carried out. The compressive strength and tensile strength of concrete and the strain in two loading directions were measured. According to the test results, the biaxial tensile strength and deformation characteristics of concrete at different tension-compression ratios are systematically investigated. It is found that the tensile-compression ratio has a significant effect on the strength and deformation properties of ordinary concrete. The failure criterion of biaxial compression of normal concrete considering the tension-compression ratio is established, which is in good agreement with the experimental data. The conclusions drawn from the analysis are as follows: In practical engineering, the bearing capacity of concrete structures under biaxial tension-compression stress is lower than that of uniaxial stress state concrete structures. The experimental data and theoretical analysis of this paper enriched the theory of multiaxial strength of concrete.