低配筋混凝土断裂韧度的变化

Variation of Fracture Toughness of Concrete with Low Percentage of Reinforcement

本文对7组28根不同配筋率钢筋混凝土试件的试验结果进行了分析和有限元计算,在此基础上讨论了低配筋率时混凝士的断裂韧度K_10和配筋率ρ的关系以及含裂纹钢筋混凝土粱的破坏过程和特点,并根据最小二乘原理,拟合了K_10～ρ关系曲线.文中初步明确了钢筋的存在对混凝土断裂性能的影响.

7 sets of 28 reinforced concrete specimens with different percentage of reinforcement have been tested. These experimental results have been analized and calculated with finite element method. The Relationship between the fractare toughness of concrete KIc and low percentage of reinforcement p has been discussed. Rupture process and its characteristics of reinforced concrete beam with cracks hone also been discussed. By means of least square, the relation curve of KIc～p has been obtained. Analyses show that reinforcement influences the fracture behaviour of concrete.