Shear resistance of continuous steel beams with thin webs

IF 8.3 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2026-05-01 Epub Date: 2026-02-26 DOI:10.1016/j.tws.2026.114731

Gábor Hajdú , Hartmut Pasternak

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引用次数: 0

Abstract

The shear buckling and post-buckling behaviour of welded plated I girders with slender webs plays a critical role in the safety and economy of steel bridge and building structures. However, experimental data and validated numerical models for multi-span girders with slender webs remain limited, and the accuracy of current design provisions is not yet fully established. This paper presents the results of an experimental and numerical investigation on ten two-span welded plated I girders with transversely stiffened webs. By placing transverse stiffeners on both sides, the web panels were divided into four or eight rectangular segments with an aspect ratio of a/h=2.5. The web slenderness ratios h/t ranged from 175 to 350, while the flange slenderness ratios b/t varied between 8 and 40. The specimens exhibited shear failure governed by tension-field action near the internal support or flange buckling in the middle of the span. To further examine the shear buckling behaviour, geometrically and materially nonlinear analyses with imperfections were performed using advanced full-shell finite element models. The validated numerical models were then employed in a comprehensive parametric study covering a wide range of geometric configurations. The numerical results were used to assess the accuracy of the shear strength formula specified in EN 1993-1-5:2024 and AISC 360-22. Based on the results of the numerical simulations new formulas are proposed for the contribution of the web and flanges to determine the shear strength of plated I girders.

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薄腹板连续钢梁的抗剪性能

细长腹板焊接工字梁的剪切屈曲和后屈曲性能对钢桥梁和建筑结构的安全性和经济性具有至关重要的作用。然而，细长腹板多跨梁的试验数据和验证的数值模型仍然有限，目前设计规定的准确性尚未完全确定。本文介绍了对10座双跨钢板焊接I型横向加筋腹板梁的试验和数值研究结果。通过在两侧放置横向加强筋，腹板被分成四个或八个矩形段，长径比为a/h=2.5。腹板长细比h/t在175 ~ 350之间，法兰长细比b/t在8 ~ 40之间。试件表现出由内部支撑附近的张力场作用或跨中部法兰屈曲控制的剪切破坏。为了进一步研究剪切屈曲行为，使用先进的全壳有限元模型进行了几何和材料非线性分析。然后将验证的数值模型用于涵盖广泛几何构型的综合参数研究。用数值计算结果对en1993 -1-5:2024和AISC 360-22中规定的抗剪强度公式的准确性进行了评价。根据数值模拟结果，提出了新的腹板和翼缘对钢板工字梁抗剪强度的贡献公式。

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.