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Ç°ÑÔ Preface l5 Preface¢ò7 Summary9 1 Introduction¡£1 1£®1 0verviewl 1£®2 Fracture Experiments of’l-hree Gorges Dam Concrete·2 1£®2£®1 Specimens2 1£®2£®2 Materials and mix proportions3 1£®2£®3 Test program·3 1£®2£®4 Three—point bending notched beam(TPB)tests5 1£®2£®5 Wedge splitting(WS)test8 1£®2£®6 Direct tension(DT)tests and fundamental mechanical performance tests 2 State—of-the—art Review on Concrete Softening Curvel4 2£®1 Introductionl4 2£®2 Determination Approach of the Tensile Softening Relationships(¶¢Ò»W CUn£¬es) of Concrete£®l4 2£®2£®1 Direct tension test methodl4 2£®2£®2 J-Integral methodl5 2£®2£®3 Inverse analysis method-16 2£®3 Shape ofSoftening Curve ofConcrete16 2£®3£®1 Linear shape softening curve ofconcretel6 2£®3£®2 Linear softening curve ofconcretel7 2£®4 Conclusionsl9 References·£®l9 3 Two Meth¡£ds for Determining Softening Relati¡£nshipS Of Dam Concrete and Wet£®screeIlilÅà Concrete¡£21 3£®1 Introduction21 ……