Flexural fatigue-life reliability of frost-damaged concrete

被引：7
|
作者：
Ou Z.-M. [1 ]
Sun L. [2 ,3 ]
机构：
[1] Guangdong Pearl River Delta Intercity Railway Co. Ltd, Guangzhou
[2] School of Transportation, Southeast University, Nanjing
[3] Department of Civil Engineering, The Catholic University of America, Washington DC
来源：
Sun, Lu (sunl@cua.edu) | 1600年 / Zhejiang University卷 / 51期
关键词：
Concrete; Flexural fatigue; Freeze-thaw cycles (FTC); Frost-damaged; P-S-N curves; Safety factor;
D O I：
10.3785/j.issn.1008-973X.2017.06.003
中图分类号：
学科分类号：
摘要：
The three-point bending tests were conducted on concrete beam specimens which were first frost-damaged by the rapid frozen-thaw method in order to investigate the effect of frost-damaged on flexural fatigue life of concrete. A two-parameter Weibull distribution model was introduced to describe the experimental flexural fatigue life and the reliability probability analysis was carried out to calculate the theoretical flexural fatigue life for the frost-damaged concrete. Based on the experimental and theoretical studies, the relationship of the fatigue life-fatigue strength and the P-S-N curve was obtained. It is shown that static flexural strength, flexural fatigue strength and life significant decrease as the number of freeze-thaw cycles (FTC) increase. The tested results of the K-S test indicate that the two-parameter Weibull distribution function can appropriately describe the probability distribution of flexural fatigue life. Results of the estimated shape parameter of the Weibull distribution by the method of moments show that the scatter of the flexural fatigue life increases with the increase of the number of FTC. Reliability analysis results indicate that the reliability probability(safety factor)of the flexural fatigue life for the frost-damaged concrete decrease as the number of FTC increase. For the concrete structure service in cold climate regions, it is necessary to increase the value of safety factor of the flexural fatigue life(strength) to resist the fatigue loading. © 2017, Zhejiang University Press. All right reserved.
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页码：1074 / 1081and1103
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