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为了研究混凝土在单轴受压作用下的全过程受力特征,通过对强度等级为C30~C60的60个混凝土棱柱体试件进行单轴受压应力-应变全曲线试验,得到了单轴受压作用下混凝土峰值强度、峰值应变、弹性模量和应力-应变全曲线的统计特征.根据混凝土结构设计规范(GB50010—2010)中的混凝土峰值强度变异系数,利用概率密度演化方法,获得了混凝土应力均值曲线和应力标准差曲线.通过与试验结果进行对比,认为仅用峰值强度的变异系数不足以描述混凝土应力-应变全过程的随机性,建议给出标准差曲线.
In order to study the whole process of concrete under uniaxial compression, the uniaxial compressive stress-strain curves of 60 concrete prism specimens with C30 ~ C60 strength were obtained. The statistical characteristics of the peak strength, the peak strain, the elastic modulus and the stress-strain full curve of the concrete under the pressure are obtained.According to the variation coefficient of the peak intensity of concrete in the design code of concrete structure (GB50010-2010), the probability density evolution method is used to obtain the concrete Stress mean curve and stress standard deviation curve.Compared with the test results, it is considered that the coefficient of variation of the peak strength is not enough to describe the randomness of the whole process of stress-strain of concrete, and the standard deviation curve is suggested.