Experimental study on fatigue behavior of reinforced concrete beams strengthened by prestressed CFRP sheets

被引：3
|
作者：
He C. [1 ]
Wang W. [1 ]
Yang W. [2 ]
Ye J. [1 ]
机构：
[1] School of Transportation, Southeast University
[2] Henan Provincial Communications Planning Survey and Design Institute Co., Ltd.
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2011年 / 41卷 / 04期
关键词：
Experiment; Fatigue; Prestressed CFRP (carbon fiber reinforced polymer) sheets; Reinforced concrete beams; Strengthening;
D O I：
10.3969/j.issn.1001-0505.2011.04.035
中图分类号：
学科分类号：
摘要：
Four RC(reinforced concrete) beams strengthened with non-prestressed/prestressed CFRP(carbon fiber reinforced polymer) sheets and one contrast beam were tested to investigate the fatigue behavior. The prestressing levels of CFRP sheet, the amount of prestressed CFRP sheets, and the amplitude of fatigue loads were taken into consideration. The symmetrical two-point loads with constant amplitude and frequency were applied on all test beams. The test results show that the cracks of contrast beam are fewer and wider under fatigue loads. The cracks of the beam strengthened with non-prestressed CFRP sheets are more and denser with lower height and narrower width than the former. However in beams with prestressed CFRP sheets the amount of cracks is even more, the value of height and width become even smaller. The development of cracks are hindered and the stress amplitude of the tensioned bar is decreased and the fatigue life is obviously increased as compared to normal strengthening method. When RC beams are strengthened with prestressed CFRP sheets, the effect is more obvious.
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页码：841 / 847
页数：6
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