基于数字图像关联和声发射技术的 FRP 加固混凝土断裂行为表征

Insight - Non-Destructive Testing and Condition Monitoring Pub Date : 2023-11-01 DOI:10.1784/insi.2023.65.11.600

Xiangqian Fan, Jueding Liu

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引用次数: 0

摘要

为了确定纤维增强聚合物（FRP）增强混凝土的动态断裂特性，对 FRP 增强混凝土进行了五种不同应变加载速率（10-1/s、10-2/s、10-3/s、10-4/s 和 10-5/s）的三点弯曲断裂试验。使用数字图像相关（DIC）和声发射（AE）技术分析了 FRP 加固混凝土的断裂行为。观察了 FRP 加固混凝土梁在断裂过程中的裂缝扩展情况，并确定了 AE 参数与达到极限荷载前的荷载水平之间的定量关系。有关 AE 参数变化的测试结果可以描述 FRP 加固混凝土梁的内部损坏行为，并监测任何裂缝的分布特征。使用 DIC 技术可以观察 FRP 加固混凝土梁的裂缝扩展轨迹，并对裂缝开口位移 (COD) 进行定量分析。

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Fracture behaviour characterisation of FRP-reinforced concrete based on digital image correlation and acoustic emission technology

In order to identify the dynamic fracture characteristics of fibre-reinforced polymer (FRP)-reinforced concrete, three-point bending fracture tests of FRP-reinforced concrete with five different strain loading rates (10−1/s, 10−2/s, 10−3/s, 10−4/s and 10−5/s) are carried out. The fracture behaviour of FRP-reinforced concrete is analysed using digital image correlation (DIC) and acoustic emission (AE) techniques. Crack propagation in FRP-reinforced concrete beams during the fracture process is observed and a quantitative relationship is established between the AE parameters and the load level before the ultimate load is reached. Test results on the variation of the AE parameters can characterise the internal damage behaviour of the FRP-reinforced concrete beams and monitor the distribution characteristics of any cracks. The crack propagation trajectory of the FRP-reinforced concrete beams can be observed using the DIC technique and quantitative analysis of the crack opening displacement (COD) can be achieved.

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Insight - Non-Destructive Testing and Condition Monitoring

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