Stability of prestressed stayed I-section steel columns: Zones-based and intelligent design considering local buckling

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-11 DOI:10.1016/j.tws.2025.113269

Kaidong Wu , Xinyu Zhou , Cheng Huang , Zhe Xing , Ziheng Lu , Kuntao Quan

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Abstract

The instability and design methods of prestressed stayed I-section steel columns are investigated with local buckling taken into accounts. Mechanical tests on this system are conducted, and a validated finite element modelling is developed. The conventional prestressing zones are revised through introducing the effective cross-section from EN 1993-1-5. It is found that the nonlinear stability and actual optimum prestress of this system are strongly linked to dominant global buckling modes, and for the cases with more significant local buckling, the buckling and post-buckling behaviour are less sensitivity to stay size, crossarm length and prestressing levels. Explicit expressions for designing the load-carrying capacity of this system are proposed based on the revised prestressing zones, and an artificial neural network (ANN) model for predicting ultimate loads is also developed. The comparison between these two design methods shows that the performance of the ANN model based design method is more robust and satisfied.

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预应力工字截面钢柱的稳定性：考虑局部屈曲的区域智能设计

研究了考虑局部屈曲的预应力工字形截面钢柱的失稳及设计方法。对该系统进行了力学试验，并建立了有效的有限元模型。通过引入en1993 -1-5的有效截面，对传统预应力区域进行了修订。研究发现，该系统的非线性稳定性和实际最优预应力与主要的全局屈曲模式密切相关，而对于局部屈曲较为显著的情况，屈曲和后屈曲行为对横臂尺寸、横臂长度和预应力水平的敏感性较小。提出了基于修正预应力区域的系统承载力设计显式表达式，并建立了预测极限荷载的人工神经网络（ANN）模型。两种设计方法的比较表明，基于人工神经网络模型的设计方法具有更强的鲁棒性和令人满意的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.