Buckling behaviour of high-strength retrofitted steel sections manufactured through post heat-treatment processes

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-10-24 DOI:10.1016/j.tws.2024.112626

Shadiya Jamshiyas , Konstantinos Skalomenos , Yang Ma , Marios Theofanous

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Abstract

High-strength steel is increasingly popular in construction for its strength-to-weight ratio, which lowers the self-weight of structures and reduces transportation, erection, and foundation costs. Induction hardening (IH) process which involves rapid heating and cooling of the material leads to microstructural changes which enhance the hardness and strength of conventional steel, elevating it to the level of High Strength (HS) steel. This study reports an extensive investigation on the buckling response and design of IH post-treated structural steel Circular Hollow Sections (CHS). It includes tensile coupon tests, microstructural analyses, initial geometric imperfection measurements, and residual stress evaluations to determine the effects of IH treatment on CHS. Column buckling tests were conducted, and a numerical model was developed and validated against the experimental results which was utilised to study systematically the effect of imperfections. The findings suggest that the magnitude of the imperfections in IH steel sections doubled compared to the non-treated condition, whilst there was a minimal impact on the residual stresses. A comprehensive parametric study was performed using finite element models to study the structural response of IH steel CHS columns over a large range of global slendernesses and allow the assessment of the buckling curves specified in EN 1993–1–1. It was concluded that the buckling curve a (imperfection factor, α=0.21) specified in EN 1993–1–1 provides the best buckling load predictions for the IH steel CHS columns, the response of which is superior to that of their virgin counterparts, despite the increased imperfections caused by the heat-treating process.

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通过后热处理工艺制造的高强度改造型钢的屈曲性能

高强度钢以其强度重量比降低了结构自重，减少了运输、安装和地基成本，在建筑领域越来越受欢迎。感应淬火（IH）工艺涉及材料的快速加热和冷却，会导致微观结构变化，从而提高传统钢材的硬度和强度，使其达到高强度（HS）钢材的水平。本研究报告对 IH 后处理结构钢圆形空心型钢 (CHS) 的屈曲响应和设计进行了广泛调查。它包括拉伸试样测试、微观结构分析、初始几何缺陷测量和残余应力评估，以确定 IH 处理对 CHS 的影响。进行了立柱屈曲试验，开发了一个数值模型，并根据试验结果进行了验证，利用该模型系统地研究了缺陷的影响。研究结果表明，与未处理的情况相比，IH 钢截面的缺陷程度增加了一倍，而对残余应力的影响却微乎其微。使用有限元模型进行了全面的参数研究，以研究 IH 钢 CHS 柱在较大的整体细长度范围内的结构响应，并对 EN 1993-1-1 中规定的屈曲曲线进行评估。研究得出的结论是，EN 1993-1-1 中规定的屈曲曲线 a（不完美系数，α=0.21）为 IH 钢 CHS 柱提供了最佳屈曲载荷预测，尽管热处理过程导致不完美增加，但其响应优于原始同类产品。

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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.