摘要
近年来徐世和H .W .Reinhardt提出的基于粘聚力的裂缝扩展阻力曲线 (KR 阻力曲线 ) ,揭示了准脆性材料裂缝扩展过程中粘聚力与裂缝扩展阻力之间的关系 ,反映断裂过程区软化特性的混凝土软化本构关系与KR 阻力曲线的解析解密切相关 为了获得较为精确的KR 阻力曲线 ,首先应确定合理的软化本构关系 结合混凝土三点弯曲切口梁试验 ,就软化本构关系、试件尺寸、材料强度对KR
The crack extension resistance curve ( K R curve) based on the cohesive force ,recently proposed by Xu Shilang and H.W. Reinhardt , shows a relationship between the cohesive force and crack extension resistance in quasi brittle materials during crack propagation. The analytical result of the K R curve is strongly affected by the softening traction separation law which describes the softening behavior of fracture process zone in concrete. In order to obtain the K R curve with high accuracy, an appropriate softening traction separation law must be determined. Based on the results from three point bending notched beam experiments, the influence of softening traction separation law, specimen size and compressive strength of concrete on the K R curve were studied respectively.
出处
《三峡大学学报（自然科学版）》
CAS
2002年第1期19-25,共7页
Journal of China Three Gorges University：Natural Sciences
基金
国家杰出青年科学基金资助项目 (5962 581 4 )
关键词
混凝土
裂缝
扩展阻力曲线
软化本构关系
材料强度
concrete
cohesive force
crack extension resistance curve
double K fracture parameters
softening traction separation law
size effect
strength
