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根据所使用的混凝土本构模型,采用分段拟合的方式,导出了单调荷载作用下混凝土的受拉损伤指标;提出了混凝土梁在单调荷载作用下的弯曲损伤指标β,推导得到了它的解析表达式,通过单轴拉伸实验对受拉损伤指标以及弯曲损伤指标β的合理性进行了验证,得到了混凝土梁弯曲损伤指标随应变的变化规律.结果表明混凝土梁在峰值以前的损伤是不可忽略的,邻近峰值时,其抗弯刚度降低29.12%,在梁丧失承载力时损伤为0.79.
According to the constitutive model of concrete used, the method of piecewise fitting is adopted to derive the tensile damage index of concrete under monotonic loading. The bending damage index β of concrete beam under monotonic loading is proposed and its Through the uniaxial tensile test, the tensile damage index and the rationality of the bending damage index β were verified, and the change law of the bending damage index of the concrete beam with strain was obtained.The results show that the damage of the concrete beam before the peak is Can not be ignored, near the peak value, its bending stiffness decreased by 29.12%, loss of capacity in the beam damage is 0.79.