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不少学者在试验中已经发现,混凝土断裂韧度的数值是随着试样尺寸的增大而增大的,这就是混凝土断裂韧度的尺寸效应.用Weibull脆性破坏统计理论来研究这个问题,是一个有效的途径,本文研究了混凝土直三点弯曲试样断裂韧度的尺寸效应,用Weibull理论分别按链条模型和修正链条模型两种情况导出了尺寸效应关系式.并进行了6组试样的试验加以验证.此外,本文还收集了两种典型试验资料进行对比验证.从而明确了在研究断裂韧度的尺寸效应时,系数α由非均匀应力场的比例试样确定,精度较高.
Many scholars have found in experiments that the value of the fracture toughness of concrete increases with the size of the specimen. This is the size effect of the fracture toughness of the concrete. The Weibull brittle failure statistics theory is used to study this problem. It is an effective way to study the size effect of the fracture toughness of straight three-point bending specimens of concrete. The Weibull theory is used to derive the size effect relationship between the chain model and the modified chain model. Six sets of tests are performed. This type of test was verified. In addition, two typical test data were collected for comparison and verification. It was thus clear that in the study of the size effect of fracture toughness, the coefficient α was determined from the proportion of non-uniform stress field specimens with high accuracy. .