摘要
通过100个尺寸为100 mm×100 mm×515 mm的钢纤维高强混凝土试件以及相同尺寸的45个高强混凝土试件切口梁三点弯曲试验,探讨了钢纤维体积分数和相对切口深度对高强混凝土断裂韧度的影响和高强混凝土断裂韧度的统计分布规律.结果表明,随着钢纤维体积分数的增加,钢纤维高强混凝土断裂韧度增益比成线性增加;随着切口深度的增加,断裂韧度略有降低;高强混凝土断裂韧度服从威布尔分布.在试验结果的基础上,建立了钢纤维高强混凝土断裂韧度的计算公式.
Through three-point bending test strength concrete（SFHSC） and 45 specimens on 100 specimens of steel fiber reinforced high of plain high strength concrete（HSC） with the size of 100 mm× 100 mm × 515 mm, the effect of the fiber volume fraction（φf） and relative notch depth（a/W） on the fracture toughness of plain high strength concrete was studied. The probability distribution of the fracture toughness（KIC） of high strength concrete was studied as well. The results show that the increment ratio of the fracture toughness increases linearly with the increase of φf. The fracture toughness of steel fiber reinforced high strength concrete and plain high strength concrete decreases with the increase of notch depth. The theoretical distribution function of the fracture toughness of plain high strength concrete is in accordance with the Weibull distribution function. Based on the test results, the formula for calculating KfIC was proposed.
出处
《建筑材料学报》
EI
CAS
CSCD
2007年第5期577-582,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(50579068)
关键词
钢纤维
高强混凝土
概率分布
断裂韧度
steel fiber
high strength concrete
probability distribution
fracture toughness
