【摘要】 定量描述混凝土断裂全过程的新KR 阻力曲线 (裂缝扩展阻力曲线 ) ,可通过简便的试验和基于虚拟裂缝扩展粘聚力的解析法得到 ,它与混凝土的软化本构曲线形状密切相关。我们结合新进行的断裂试验 ,调整参数λ,从起裂韧度的解析解和其实测值相符入手 ,便可确定合理的双线性软化本构曲线形状 ,以其计算的KR 阻力曲线随混凝土强度的增加而增大。更多还原

【Abstract】 Using a simple experimental method and an analytically evaluating method based on the cohesive force acted on the fictitious crack zone, the new K R curve(crack extension resistance curve) quantitatively describing the complete fracture process of concrete can be obtained. The new K R curve tightly depends on the shape of softening traction separation law in the calculation. According to the fracture experiment carried out recently by our research team, the reasonable shape of softening traction separation law can be determined by means of adjusting the parameter λ and making the analytical solution of initial fracture toughness equal to it’s measured result. It can be seen that the new K R curve evaluated with the reasonable shape of softening traction separation law increases with the increasing compressive strength of concrete.更多还原