Fe-SMA/钢结构单搭接剪力节点初始刚度的试验与理论研究

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-09 DOI:10.1016/j.tws.2025.113432

Yue Shu, Xuhong Qiang, Xu Jiang

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引用次数: 0

摘要

基于键合和活化技术，铁基形状记忆合金（Fe-SMA）被广泛应用于在役钢结构的修复和改造。刚度是判断钢结构损伤程度的重要参数，对整个结构的变形能力具有重要意义。本研究提出了基于剪切滞后模型的理论公式来预测Fe-SMA/钢单搭接剪切节点（SSJs）的初始刚度，考虑沿上基板搭接长度的拉应力不均匀。通过剪切试验研究了90个试件的初始刚度。试验结果验证了FE - sma /钢ssj有限元模型和理论公式的准确性。此外，还建立了60个有限元模型，以评估推导公式对其他类型复合衬底ssj的适用性。进一步进行了包含90个有限元模型的参数化研究，以探索FE - sma /钢ssj的初始刚度。结果表明，在老化条件下，胶粘剂的性能退化对试件的初始刚度有明显影响。与试验结果比较，理论公式对试件初始刚度的最大误差为18%，平均误差为1%，精度较好。搭接长度对ssj初始刚度的影响可以忽略不计，而初始刚度与Fe-SMA厚度和搭接宽度的增加呈线性关系。ssj初始刚度的实验和理论研究成果对于保证结构安全、推进Fe-SMA的利用以及优化在役钢结构基础设施的加固设计具有重要意义。

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Experimental and theoretical studies on initial stiffness of Fe-SMA/steel single-lap shear joints for structural reinforcements

Based on bonding and activating technology, iron-based shape memory alloy (Fe-SMA) is extensively employed to repair and retrofit in-service steel structures. Stiffness is an important parameter utilized to infer the degree of damage to steel structures, which is meaningful for the deformation capacity of the whole structure. This study proposes a theoretical formula based on the shear-lag model to forecast the initial stiffness of Fe-SMA/steel single-lap shear joints (SSJs), considering the uneven tensile stress along the lap length of the upper substrate. The initial stiffnesses of 90 specimens are studied through shear tests. The accuracy of finite element (FE) models of Fe-SMA/steel SSJs and theoretical formulas is verified by the test results. Additionally, 60 FE models are established to assess the applicability of the derived formula on other types of SSJs with composite substrates. A parametric study containing 90 FE models is further implemented to explore the initial stiffness of Fe-SMA/steel SSJs. Results demonstrate that the performance degradation of the adhesives noticeably affects the initial stiffness of specimens under aging conditions. Compared with test results, the maximum and average errors of the theoretical formula on the initial stiffness of specimens are 18 % and 1 %, respectively, indicating satisfactory accuracy. Lap length has a negligible effect on the initial stiffness of the SSJs, whereas the initial stiffness exhibits a linear relationship with the enhancement of Fe-SMA thickness and lap width. The experimental and theoretical achievements regarding the initial stiffness of the SSJs are critical for ensuring structural safety, advancing the utilization of Fe-SMA, and optimizing the strengthening design of in-service steel infrastructures.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.