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首页> 外文期刊>Structural concrete >Fatigue behavior of prefatigued reinforced concrete beams rehabilitated with near surface mounted carbon fiber reinforced polymer reinforcement
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Fatigue behavior of prefatigued reinforced concrete beams rehabilitated with near surface mounted carbon fiber reinforced polymer reinforcement

机译：靠近表面安装碳纤维增强聚合物增强件恢复钢筋混凝土梁的疲劳行为

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摘要

This paper investigates the influence of cyclic preloading on the fatigue behavior of reinforced concrete (RC) beams rehabilitated with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) reinforcement. The study includes eight RC beams with dimensions of 152.4 × 152.4 × 1,521 mm. Strengthened and non-strengthened specimens were tested under monotonic loading to obtain the flexural static capacity. Two strengthened specimens were tested as a reference under constant amplitude cyclic stress without prefatiguing. Four nonrehabilitated RC beams were prefatigued to simulate service loading conditions. Later, these RC beams were rehabilitated with NSM CFRP reinforcement and tested under the same cyclic stress range of the reference specimens. Mid-span deflection, strain of tension steel rebars and CFRP rods, stiffness degradation, and energy dissipation were analyzed and evaluated. Experimental results show that the rehabilitated prefatigued RC beams had similar stiffness degradation and failure modes to the reference strengthened RC beams. The rehabilitated RC beams had an improvement in the fatigue responses when compared to the reference strengthened RC beams. Moreover, the postfatigue monotonic behavior of the rehabilitated RC beams showed an increase in the elastic modulus and a decrease in ductility.
机译：本文研究了循环预加载对恢复附近安装（NSM）碳纤维增强聚合物（CFRP）加固钢筋混凝土（RC）梁疲劳行为的影响。该研究包括八个RC光束，尺寸为152.4×152.4×1,521mm。在单调载荷下测试加强和非加强的标本，以获得弯曲静态容量。在恒定幅度循环应力下测试两个强化标本作为参考，而不进行预提g。预先采用四个非重量的RC光束以模拟服务负载条件。后来，这些RC梁用NSM CFRP加固恢复并在参考标本的相同循环应力范围下进行测试。分析和评估了跨度偏转，张力钢钢筋和CFRP杆，刚度降解和能量耗散。实验结果表明，恢复的卓相关的RC光束对参考强化RC梁具有相似的刚度降解和失效模式。与参考增强的RC光束相比，恢复的RC光束在疲劳响应中具有改善。此外，恢复的RC光束的功率单调行为显示出弹性模量的增加和延展性降低。

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