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中文摘要：
针对纤维混凝土软化过程无固定模型和Ⅰ型断裂研究较少的现状，本文利用碳纤维混凝土的机敏性捕捉到了三点弯曲梁试件的起裂荷载。引入双K断裂准则计算了碳纤维混凝土的起裂韧度KUC^ini和失稳韧度KIC^un，认为利用双K断裂准则可以更有效地解释纤维对混凝土的增韧作用。通过对电阻变化率与荷载、挠度和裂缝口张开位移（CMOD）关系的分析，认为碳纤维混凝土机敏性可以较好地应用到三点弯曲梁Ⅰ型断裂的研究中，电阻变化率与荷载、跨中挠度和裂缝口张开位移（CMOD）的关系能较好地符合洛仑兹曲线的关系，该关系可以反映试件在峰值荷载前的弹性变形阶段、裂缝稳定开裂阶段和裂缝失稳开裂阶段。
英文摘要：
According to actuality that softening process has no stable model and mode Ⅰ fracture has been investigated rarely, the smart properties of CFRC are utilized to attain the initial load of three-point bending beam. Double- K criterion is used to compute. KIC^ini and KIC^un, which can explain the toughening effect of fiber effectually. The smart properties of CFRC can be used to research mode Ⅰ fracture of three-point bending beam after analysis of the relationships .between relative variation of resistance and load, deflection and CMOD which accord with Lorentz fit. The curves of relative variation of resistance before maximum load can illustrate three stages of elastic deformation, stable fracture and unstable fracture.
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