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首页> 外文期刊>Journal of Composites for Construction >Fatigue Behavior and Prediction of NSM CFRP-Strengthened Reinforced Concrete Beams
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Fatigue Behavior and Prediction of NSM CFRP-Strengthened Reinforced Concrete Beams

机译：NSM CFRP加固钢筋混凝土梁的疲劳行为及预测

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摘要

In this study, a total of 16 reinforced concrete beams (dimensions of 203 x 305 x 3,861 mm) strengthened with near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) rods and strips were tested under four-point bending fatigue loading. Monotonic loading was applied to their corresponding control specimens to obtain the static monotonic flexural strength. Fatigue loading with a range of 10% of the corresponding static strength to various upper limits was applied to determine the empirical relationship for each type of specimen. It was found that the dominating failure mode under fatigue was rebar rupture. Mixed failure modes of rebar rupture and unstable cracks in concrete were also observed in specimens with longer fatigue life. As the specimens underwent more fatigue cycles, an increase was observed in their tensile strains of CFRP and deflections due to accumulated damages and the losses of stiffness. A fatigue bond model was developed, which simulated the process of fatigue loading as fatigue crack growth at the NSM-epoxy interface. Based on the comparison with experimental data, the model predicts well the bond behavior and progression of the debonded length for most of the fatigue life. (C) 2016 American Society of Civil Engineers.
机译：在这项研究中，在四点弯曲疲劳载荷下，测试了总共16条用近表面安装（NSM）碳纤维增强聚合物（CFRP）棒和条增强的钢筋混凝土梁（尺寸为203 x 305 x 3,861 mm）。单调加载施加到其相应的控制样本，以获得静态单调抗弯强度。施加相应静态强度的10％到各种上限的疲劳载荷，以确定每种类型的试样的经验关系。发现疲劳下的主要失效模式是钢筋断裂。在疲劳寿命更长的试样中，也观察到了钢筋断裂和混凝土不稳定裂纹的混合破坏模式。当样品经历更多的疲劳循环时，由于累积的损伤和刚度的损失，观察到它们的CFRP拉伸应变和挠度增加。建立了疲劳粘结模型，该模型模拟了NSM-环氧树脂界面处疲劳载荷随疲劳裂纹扩展的过程。基于与实验数据的比较，该模型在大部分疲劳寿命中都很好地预测了粘结行为和脱粘长度的变化。 （C）2016年美国土木工程师学会。

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