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在用直三点弯曲试验测试混凝土断裂韧度 KΙC时 ,分别有陈篪提出的和美国材料试验协会( ASTM)推荐的公式可用 ,二者究竟有多大差异是人们关注的问题。正在编制的《水工混凝土断裂试验规程》是我国第一个混凝土断裂试验规程 ,其中也涉及到选用哪个公式的问题。用直三点弯曲试验所得的试验数据进行比较 ,分析了二者的差异 ,然后用数学软件 Matlab进行函数图像分析 ,进一步讨论了两个公式的差异性问题 ,从而得出在 aW∈ ( 0 .4,0 .6)范围内两个公式差异甚微的结论
When using the straight three-point bending test to test the fracture toughness KIc of concrete, respectively, the proposed formula proposed by Chen Chi and the American Society for Testing and Materials (ASTM) is available. How much difference between the two is a matter of concern. The preparation of “hydraulic concrete rupture test code” is China’s first concrete rupture test procedures, which also involves the choice of which formula. The experimental data from the straight three-point bending test were compared and the differences between the two were analyzed. Then the functional image analysis was carried out by mathematic software Matlab, and the differences between the two formulas were further discussed. 4,0 .6) within the scope of the two formulas are very different conclusions