Investigation of fatigue behavior in prestressed CFRP reinforced RC beams exposed to natural subtropical environment

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-01-03 DOI:10.1016/j.ijfatigue.2024.108802

Yilin Wang , Ruonan Zhang , Wen Li , Peiyan Huang , Hangyue Cui , Pengyu Wei , Roman Wan-Wendner , Xinyan Guo

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引用次数: 0

Abstract

This study explores the fatigue behavior of prestressed CFRP-reinforced concrete (RC) beams in subtropical environments, addressing the gap in understanding their long-term performance under natural exposure. Five specimens were subjected to one year of natural exposure under sustained load conditions before fatigue testing. During the exposure period, the strain on the CFRP laminate was monitored, and a decrease of 5.37% in prestress loss after exposing 300 days was observed. The digital image correlation (DIC) method was employed to capture the crack initiation and growth during the fatigue tests, with detailed analyses of crack growth rates, deflection evolution, and failure modes. Experimental results indicated that natural exposure accelerates fatigue crack growth compared to the results of the unexposed RC beams tested by this group. Moreover, the finite element model (FEM) was developed to account for CFRP-concrete interface degradation due to natural exposure and material nonlinearities, allowing for the determination of the J-integral of the main crack. Fatigue life prediction models, based on experimentally obtained crack growth rates and stress intensity factors (SIF) calculated using the J-integral, were derived. The predicted fatigue lives were within a 20% error margin of the experimental results, demonstrating the reliability of the proposed models.

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暴露于亚热带自然环境中的预应力 CFRP 加固 RC 梁的疲劳行为研究

本研究探讨了亚热带环境下预应力cfrp -钢筋混凝土（RC）梁的疲劳行为，解决了在自然暴露下了解其长期性能的空白。在进行疲劳试验之前，五个试件在持续载荷条件下自然暴露一年。暴露期间，对CFRP复合材料进行应变监测，暴露300 d后预应力损失减小5.37%。采用数字图像相关（DIC）方法捕捉疲劳试验过程中裂纹的萌生和扩展过程，并对裂纹扩展速率、挠度演化和破坏模式进行了详细分析。实验结果表明，与未暴露的RC梁相比，自然暴露加速了疲劳裂纹的扩展。此外，开发了有限元模型（FEM）来考虑由于自然暴露和材料非线性导致的cfrp -混凝土界面退化，从而可以确定主裂缝的j积分。基于实验得到的裂纹扩展速率和用j积分计算的应力强度因子（SIF），推导了疲劳寿命预测模型。预测疲劳寿命与试验结果误差在20%以内，证明了所提模型的可靠性。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.