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首页> 美国卫生研究院文献>Polymers >Fatigue Life Prediction of Reinforced Concrete Beams Strengthened with CFRP: Study Based on an Accumulative Damage Model
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Fatigue Life Prediction of Reinforced Concrete Beams Strengthened with CFRP: Study Based on an Accumulative Damage Model

机译：CFRP加固钢筋混凝土梁的疲劳寿命预测：基于累积损伤模型的研究

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摘要

With the prestressed carbon fiber reinforced polymer (CFRP) strengthening technique widely used in reinforced concrete (RC) structures, it is more and more important to study the fatigue performance of RC structures. Since the fracture of a tensile steel bar at the main cracked section is the leading reason for the failure of RC beams reinforced by prestressed CFRP, a fatigue life prediction model of RC beams reinforced by prestressed CFRP was developed based on an accumulative damage model. Moreover, gradual degradation of the performance of the concrete was considered in the fatigue life prediction model. An experimental study was also conducted to research the fatigue behavior of RC beams reinforced by prestressed or non-prestressed carbon fiber laminate (CFL). During the tests, fatigue crack patterns were captured using a digital image correlation (DIC) technique, and the fatigue lives of a total of 30 beams were recorded. The results showed that the predicted main crack propagation curves and the fatigue lives were close to the experimental data. This study also exhibited that the prestressed CFRP could reduce the stress of main steel bars in RC beams and effectively improve the fatigue performance of the RC beams.
机译：随着预应力碳纤维增强聚合物（CFRP）加固技术广泛应用于钢筋混凝土（RC）结构，研究RC结构的疲劳性能变得越来越重要。由于主裂纹处的拉伸钢筋断裂是预应力CFRP加固RC梁失效的主要原因，因此，基于累积损伤模型，建立了预应力CFRP加固RC梁的疲劳寿命预测模型。此外，在疲劳寿命预测模型中考虑了混凝土性能的逐渐降低。还进行了实验研究，以研究预应力或非预应力碳纤维叠层（CFL）增强的RC梁的疲劳性能。在测试过程中，使用数字图像相关（DIC）技术捕获了疲劳裂纹图案，并记录了总共30根光束的疲劳寿命。结果表明，预测的主裂纹扩展曲线和疲劳寿命与实验数据接近。这项研究还表明，预应力CFRP可以减轻钢筋混凝土梁中主要钢筋的应力，并有效地改善钢筋混凝土梁的疲劳性能。

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