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Study on the stiffness degradation in concrete continuous beam with externally prestressed CFRP tendons under fatigue loading
Advances in Structural Engineering ( IF 2.6 ) Pub Date : 2021-02-11 , DOI: 10.1177/1369433221992492
Xing Li 1 , Jiwen Zhang 1 , Jun Cheng 1, 2
Affiliation  

This paper presents fatigue behaviors and the stiffness degradation law of concrete continuous beams with external prestressed carbon fiber-reinforced polymer (CFRP) tendons. Three specimens were tested under fatigue loading, and the influence of different load levels on the stiffness degradation and fatigue life were studied, and it was found that the stiffness degradation of three test specimens exhibited a three-stage change rule, namely rapid decrease, stable degradation, and sharp decline, but there are obvious differences in the rate and amplitude of stiffness degradation. The load level has a significant influence on the fatigue life of the test specimens. An analytical model with load level considered was proposed to calculate the residual stiffness and predict the stiffness degradation, which is in good agreement with the test results. The model of stiffness degradation presents a possible solution for practical engineering applications of concrete continuous beams with externally prestressed CFRP tendons subjected to different fatigue loadings.



中文翻译:

疲劳荷载下体外预应力CFRP筋混凝土连续梁的刚度退化研究

本文提出了带有外部预应力碳纤维增强聚合物(CFRP)筋的混凝土连续梁的疲劳行为和刚度退化规律。在疲劳载荷下测试了三个试样,研究了不同载荷水平对刚度退化和疲劳寿命的影响,发现三个试样的刚度退化表现出三个阶段的变化规律,即快速下降,稳定。刚度下降,并且急剧下降,但是刚度下降的速度和幅度存在明显差异。载荷水平对试样的疲劳寿命有重要影响。提出了一种考虑载荷水平的解析模型来计算残余刚度并预测刚度的下降,与试验结果吻合良好。

更新日期:2021-02-11
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