Experimental study on bond-slip behaviors of CFRP sheet-Q690 high strength steel plate considering the effect of CFRP sheet thickness and bonding length

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-09-16 DOI:10.1016/j.istruc.2024.107293

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引用次数: 0

Abstract

With the increasing application of carbon fiber reinforced polymer (CFRP) in steel structure engineering, the bond-slip behavior between the two has attracted much attention. Firstly, 18 sets of CFRP sheet-Q690qD high-strength steel double strap shear specimens were fabricated considering the effects of CFRP sheet thicknesses and bond length. Then, static and fatigue tests were conducted on them. Subsequently, based on the 3D-DIC acquisition technology, the bond-slip curves were obtained using the smoothing method and the fitting method respectively Finally, the three key parameters of $τ_{\max}$ , $s_{1}$ and $s_{f}$ in the bifurcated model at each working condition were obtained. The experimental results indicated that the bond length was positively correlated with the static load ultimate strength, while the thickness of the CFRP sheet had less effect on the ultimate strength. The fatigue life of the specimen with a bond length of 40 mm under equal stress ratio fatigue loading was much higher than that of the specimens with bond lengths of 60 mm and 80 mm. It was found that the fitting method had better stability and accuracy in fitting the bond-slip curves of CFRP sheet-Q690qD high-strength steel specimens. The accuracy of the fitting maximum bond load was above 80 %, which can provide a relevant basis for the subsequent numerical simulation calculation.

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考虑 CFRP 片材厚度和粘接长度影响的 CFRP 片材-Q690 高强度钢板粘接-滑动行为实验研究

随着碳纤维增强聚合物（CFRP）在钢结构工程中的应用日益广泛，二者之间的粘结滑移行为备受关注。首先，考虑到 CFRP 片材厚度和粘结长度的影响，制作了 18 套 CFRP 片材-Q690qD 高强度钢双带剪切试件。然后，对其进行了静态和疲劳试验。随后，基于 3D-DIC 采集技术，分别采用平滑法和拟合法得到了粘结-滑移曲线，最后得到了各工况下分叉模型中的τmax、s1 和 sf 三个关键参数。实验结果表明，粘接长度与静载荷极限强度呈正相关，而 CFRP 片材的厚度对极限强度的影响较小。在等应力比疲劳荷载下，粘接长度为 40 毫米的试样的疲劳寿命远高于粘接长度为 60 毫米和 80 毫米的试样。研究发现，拟合方法在拟合 CFRP 片材-Q690qD 高强度钢试样的粘结滑移曲线时具有更好的稳定性和准确性。拟合最大粘结载荷的精确度在 80% 以上，为后续的数值模拟计算提供了相关依据。

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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.