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本文提出了用带切口梁的三点弯曲试验确定纤维增强混凝土拉伸软化本构方程的方法。通过切口染三点弯曲试验获得的载荷——加载点位移曲线可间接得到纤维增强混凝土在拉伸过程中断裂过程区的能量损耗和拉伸分离位移之间的定量关系，由此即可通过数值方法拟合出其拉伸软化本构方程。
This paper presents a three-point bending test with a notched beam to determine the tensile-softening constitutive equation of fiber-reinforced concrete. The load obtained from the three-point bending test of the notch-loading point displacement curve can indirectly obtain the quantitative relationship between the energy loss and the tensile-displacement displacement of the fiber-reinforced concrete in the fracture process, and thus the numerical value can be passed. The method is fitted to its tensile softening constitutive equation.