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本文通过轴拉、弯曲以及偏心受拉的对比试验,论证了混凝土的极限拉伸值随应力梯度增大而增大的规律,并用Weibull理论进行了定量分析.通过大试件(弯曲、轴拉)与小试件(弯曲、轴拉)的对比试验和理论分析,对小试件的试验结果能否适用于大体积混凝土进行了肯定的论证.考虑大坝温度应力的实际分布.建议将轴向拉伸试件测得的极限拉伸值乘以系数(1.23～1.35)作为设计采用.
In this paper, through the comparison tests of axial tension, bending and eccentric tension, the law that the ultimate tensile value of concrete increases with the increase of stress gradient is demonstrated, and the Weibull theory is used for quantitative analysis. Through the large specimen (bending, axial pull Comparison tests and theoretical analysis of small specimens (bending and axial pull) are performed to confirm whether the test results of small specimens can be applied to mass concrete. Consider the actual distribution of dam temperature stress. It is recommended to set the axis. The measured ultimate tensile value of the tensile specimen is multiplied by the coefficient (1.23 to 1.35) as the design.