EXPERIMENTAL STUDY ON FLEXURAL FATIGUE PERFORMANCE OF RC BEAMS STRENGTHENED WITH HYBRID FIBER SHEETS
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摘要: 通过5根钢筋混凝土梁的变幅疲劳试验,研究碳/玻璃混杂、碳/玄武岩混杂纤维布加固梁的弯曲疲劳性能,并与玄武岩纤维布加固梁进行了比较。结果表明:在纤维布粘贴层数相同条件下,混杂纤维布加固梁的抗疲劳性能更优,疲劳寿命明显延长。在均方根等效载荷法的基础上,得到了变幅疲劳试验梁的S-N曲线数学表达式,可供工程设计参数。Abstract: The variable amplitude test of BC beams was investigated with 5 specimens, in which the flexural fatiguebehavior of RC beams strengthened with carbon /glass hybrid fiber sheets and carbon /basalt hybrid fiber sheets wasstudied, and compared with that of RC beams strengthened with basalt fiber sheets. Experimental results showed thatthe anti-faigue properties of RC beams stengthened with hybrid fiber sheets was better, and the fatigue life wassignificantly prologed. Based on the root mean square(RMS) method, the S - N curves formula on variable amplitudefatigue was proposed, which may be reference for the engineering design.
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Key words:
- hybrid fiber sheets /
- basalt fiber sheets /
- reinforced concrete beam /
- fatigue behavior /
- S-N curve
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