材料科学
复合材料
纤维
纤维混凝土
极限抗拉强度
横截面
结构工程
收缩率
工程类
出处
期刊:Journal of Materials in Civil Engineering
[American Society of Civil Engineers]
日期:2002-08-01
卷期号:14 (4): 311-319
被引量:13
标识
DOI:10.1061/(asce)0899-1561(2002)14:4(311)
摘要
New experimental data make it possible to start with the synthesis of a steel fiber reinforced concrete (SFRC) load resistance model. Four stages are considered: the elastic stage, the stage of closed isolated crack development, and the stages of through-crack development in the absence of fiber ruptures and in their presence. Mathematical expectations of the tensile loads as a function of crack growth or of strains are found. Numerical experiments were carried out. The main results of these experiments were as follows: (1) Longitudinal resistance of fibers to crack growth reaches a maximum, after which it decreases to zero. (2) Transverse resistance increases monotonically. (3) Bond improvement leads to two opposite effects: an increase in longitudinal resistance and an earlier appearance of fiber ruptures. As a result, the total resistance increases if the crack opening is small and decreases if it is large. (4) Increase in the SFRC strength is larger when the bond is better.
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