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对尺寸为φ150 mm×150 mm圆柱体混凝土试件在不同加载方式(轴向加载、径向加载)、不同应变速率(10~(-5),10~(-4),10~(-3),10~(-2)s~(-1))下进行劈拉试验。分析混凝土力学性能随应变速率变化的规律,结果表明:混凝土劈拉强度随着应变速率的增大而增大;径向加载时,混凝土的劈拉强度比轴向加载时混凝土的劈拉强度高;轴向加载时混凝土的劈拉强度对应变速率更为敏感,混凝土的动态劈拉强度与应变速率的对数呈近似线性关系;混凝土吸能能力随着应变速率的增大而增大;轴向加载时,混凝土的吸能能力对应变率更敏感;与理论对比分析,径向加载曲线拟合精度更高,更符合实际受力情况;通过试验验证,发现改进的Mazars模型能很好地描述混凝土劈拉本构关系。
The test results of the specimens with the dimensions of φ150 mm × 150 mm in different loading modes (axial loading, radial loading), different strain rates (10 -5, 10 -4, 10 -3 ), 10 ~ (-2) s ~ (-1)). The results show that the splitting tensile strength of concrete increases with the increase of strain rate. When the radial load is applied, the splitting tensile strength of concrete is higher than that of the concrete under axial loading The splitting tensile strength of concrete is more sensitive to strain rate when axial load is applied. The dynamic splitting tensile strength and the logarithm of strain rate show an approximately linear relationship. The energy absorption capacity of concrete increases with the increase of strain rate. When it is loaded, the energy absorption capacity of concrete is more sensitive to the strain rate. Compared with theoretical analysis, the fitting accuracy of radial load curve is higher and more in line with the actual stress situation. The experimental results show that the improved Mazars model can well Describe the concrete splitting the constitutive relationship.