Experimental study on the fatigue behavior of CFRP-strengthened cracked steel plates under eccentric axial tension

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL Structures Pub Date : 2024-08-29 DOI:10.1016/j.istruc.2024.107182

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Abstract

In this paper, an experimental investigation has been conducted to study the fatigue behavior of single edge-notch steel plates strengthened with CFRP (laminates/sheets). The plates have been subjected to eccentric fatigue under axial loading conditions. The experimental study includes fourteen specimens and has been tested under axial loading until failure. The constant parameters in the study are steel material grade, steel plate dimensions, and fatigue loading conditions. Meanwhile, the studied parameters are steel plate initial edge crack size, CFRP configurations (length, one or two-sided, and laminates or sheets), and adhesive material strength. The experimental results revealed that the fatigue life for specimens strengthened with CFRP sheets or CFRP laminates can be improved by a factor of 1.15 to 3.87 and 1.47 to 6.32, respectively, compared with the un-strengthened specimens. The results show that using CFRP can be considered an efficient way to repair the initial cracks in steel elements under eccentric axial fatigue loading.

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偏心轴向拉力作用下 CFRP 加固开裂钢板疲劳行为的实验研究

本文通过实验研究了用 CFRP（层压板/薄板）加固的单边缺口钢板的疲劳行为。在轴向加载条件下，钢板受到偏心疲劳的影响。实验研究包括 14 个试样，在轴向加载条件下进行测试，直至失效。研究中的恒定参数是钢材料等级、钢板尺寸和疲劳加载条件。同时，研究的参数包括钢板初始边缘裂缝尺寸、CFRP 配置（长度、单面或双面、层状或片状）以及粘合剂材料强度。实验结果表明，与未加固的试样相比，使用 CFRP 片材或 CFRP 层压板加固的试样的疲劳寿命可分别提高 1.15 至 3.87 倍和 1.47 至 6.32 倍。结果表明，在偏心轴向疲劳载荷作用下，使用 CFRP 可被视为修复钢构件初始裂缝的有效方法。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.