Numerical modeling and design of cold-formed stainless steel elliptical hollow section beam-column members

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2024-11-04 DOI:10.1016/j.engstruct.2024.119244

Ye Yao , Wai-Meng Quach , Ben Young

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Abstract

This paper aims to investigate the structural behavior of cold-formed stainless steel (CFSS) elliptical hollow section (EHS) members under combined axial load plus biaxial bending by using numerical method. By using a validated finite element (FE) model for cold-formed (CF) tubular beam-column members, an extensive parametric study was conducted in this study. In order to cover various stainless steel alloys, a wide range of cross-section geometries, aspect ratios, cross-section slenderness values, member slenderness values as well as loading angles and eccentricities of the CFSS EHS beam-column members were examined. The FE predicted ultimate loads were compared with the design strengths predicted from the current interaction design expressions for CFSS structures specified in prEN 1993–1-4:2023, AS/NZS 4673 and ASCE/SEI 8–22 together with their codified slenderness limits for CFSS circular hollow sections (CHS). The Direct Strength Method (DSM) was recently proposed in the literature to predict the compression and bending resistances of CF normal grade steel EHS subjected to combined actions. The design expressions in AS/NZS 4673 and ASCE/SEI 8–22 associated with the DSM end points were also evaluated for CFSS EHS beam-column members. As the existing versions of Continuous Strength Method (CSM) were only suitable for CFSS square (SHS) and rectangular (RHS) hollow section as well as CHS members subjected to axial load plus uniaxial bending. Therefore, in this study, a modified CSM was proposed for the design of CFSS EHS beam-column members, by developing new CSM end points for CFSS EHS as well as the modified CSM interaction factors and modified CSM design formulae for CFSS EHS subjected to axial load plus biaxial bending. The comparisons revealed that the existing codified interaction design curves provided scattered and conservative predictions. By adopting the Chen and Young’s modified DSM to predict the end points, the accuracy of the design formulae in AS/NZS 4673 and ASCE/SEI 8–22 can be highly improved. However, the proposed modified CSM can achieve more accurate and reliable design predictions for CFSS EHS beam-column members than the existing codified methods and DSM.

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冷弯不锈钢椭圆空心截面梁柱构件的数值建模与设计

本文旨在通过数值方法研究冷弯不锈钢（CFSS）椭圆空心截面（EHS）构件在轴向载荷和双轴弯曲联合作用下的结构行为。本研究使用经过验证的冷成形（CF）管状梁柱构件有限元（FE）模型，进行了广泛的参数研究。为了涵盖各种不锈钢合金，研究了 CFSS EHS 梁柱构件的各种截面几何形状、长宽比、截面细长值、构件细长值以及加载角度和偏心率。将 FE 预测的极限荷载与 prEN 1993-1-4:2023、AS/NZS 4673 和 ASCE/SEI 8-22 中规定的 CFSS 结构的现行交互设计表达式预测的设计强度以及 CFSS 圆形空心截面 (CHS) 的编纂细长度限制进行了比较。最近，文献中提出了直接强度法 (DSM)，用于预测 CF 普通钢 EHS 在组合作用下的抗压和抗弯强度。AS/NZS 4673 和 ASCE/SEI 8-22 中与 DSM 端点相关的设计表达式也针对 CFSS EHS 梁柱构件进行了评估。由于现有版本的连续强度法（CSM）仅适用于 CFSS 方形（SHS）和矩形（RHS）空心截面，以及承受轴向荷载和单轴弯曲的 CHS 构件。因此，在本研究中，通过为 CFSS EHS 开发新的 CSM 端点，以及为承受轴向荷载和双轴弯曲的 CFSS EHS 开发修正的 CSM 交互作用系数和修正的 CSM 设计公式，为 CFSS EHS 梁柱构件的设计提出了修正的 CSM。比较结果表明，现有的编纂交互作用设计曲线提供了分散和保守的预测。通过采用 Chen 和 Young 的修正 DSM 来预测端点，AS/NZS 4673 和 ASCE/SEI 8-22 中设计公式的准确性可以得到很大提高。然而，与现有的编纂方法和 DSM 相比，建议的修正 CSM 可以为 CFSS EHS 梁柱构件实现更准确、更可靠的设计预测。

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.