混凝土Ⅰ－Ⅱ复合型裂纹有效断裂准则

Effective mixed mode fracture criterion for concrete

利用单边切口四点剪切梁进行了混凝土Ⅰ－Ⅱ复合型断裂试验研究．根据试验结果采用四分之一点奇异有限元法（ｔｈｅｑｕａｒｔｅｒ－ｐｏｉｎｔｓｉｎｇｕｌａｒｅｌｅ－ｍｅｎｔ）计算了各试件的应力强度因子ＫⅠ和ＫⅡ；结合本文的试验结果在广泛收集、分析国内外混凝土Ⅰ－Ⅱ复合型断裂试验资料的基础上，建立了混凝土Ⅰ－Ⅱ复合型有效裂纹断裂准则。

Mixed mode Ⅰ and Ⅱ fracture experiments are conducted using the single edge notched specimen subjected to four point loading. The quarter point singular element approach is used to calculate the stress intensity factors in the present study. The effective mixed mode fracture criterion for concrete is developed based on the test data of the study and the data available to them from several authors in China.