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- Title
预裂纹混凝土拉压疲劳荷载下裂纹扩展速率.
- Authors
沈健; 冯仲仁; 王雄江
- Abstract
A tension-compression cycle fatigue test was performed in order to study the crack growth rate of C50 concrete with pre-cracks in cyclic loading. The stress ratio was -1 and the amplitude was 0.20-1.30 MPa. The concrete crack length is difficult to determine when the crack is propagating in tensioncompression fatigue load, so the hypothesis of hidden equivalent crack length is put forward to analyze the experimental data. Compared with the 3-stage diagram of common metal crack propagation, the initial propagation at the first stage and the second stage of stable propagation are quite notable butat the third stage of accelerated expansion is not notable. At the late stage of stable propagation, the slope of fatigue crack propagation curve does not increase as fast as that for metal materials but decelerates obviously and the concrete fails suddenly without indication. It is consistent with the britt le fracture of concrete. The important parameters of Pairs formula, C and m, are fit by the least squares. When the survival rate is 50%, 90% or 99%, C value range is 0.31-0.45, 0.76-0.99, 1.22-1.98 and m value range with low survival rate sensitivity is 3.0-4.8.
- Publication
Jianzhu Cailiao Xuebao: Journal of Building Materials, 2014, Vol 17, Issue 3, p526
- ISSN
1007-9629
- Publication type
Article
- DOI
10.3969/j.issn.1007-9629.2014.03.028