Behaviour and design of bolted aluminium flange cleats

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-13 DOI:10.1016/j.tws.2025.113447

M. Cabrera , M. Theofanous , M. Bock

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引用次数: 0

Abstract

Equivalent T-stubs are traditionally employed to model the structural behaviour of the tension zone of moment resisting connections. The design model for the equivalent T-stub considers only the bending moments acting on the equivalent T-stub without considering the co-existing tensile force acting on the T-stub web. However, for flange cleats in bending, the horizontal cleat leg (i.e. the T-stub web) at the junction with the vertical leg is subjected to a co-existing tensile force in addition to the bending moment which limits its moment resistance. This is not considered in current design specifications which made them potentially unsafe. This paper reports 5 experimental tests on bolted aluminium angle cleats in grade 6082 T6 that were used to develop and validate a finite element model. Subsequently, parametric studies were conducted over a wider range of flange cleat geometries covering all types of failure modes considered in EN 1999-1-1. The design specifications for equivalent T-stubs in tension set out in EN 1999-1-1 were assessed and cases where the specifications are inaccurate or potentially unsafe were highlighted. A simple modification of the existing design model is proposed, which offers more consistent and safe ultimate capacity predictions.

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螺栓铝法兰夹板的性能和设计

传统上采用等效t型桩来模拟抗弯矩连接受拉区的结构行为。等效t型桩的设计模型只考虑作用在等效t型桩上的弯矩，而没有考虑作用在t型桩腹板上的同时存在的拉力。然而，对于弯曲的法兰理板，在与垂直支腿交界处的水平理腿（即t形短腹板）除了受到弯矩的限制外，还受到共存的拉伸力。在当前的设计规范中没有考虑到这一点，这使得它们具有潜在的不安全。本文报道了6082 T6级螺栓铝角夹板的5个试验，用于建立和验证有限元模型。随后，对更大范围的法兰清理几何形状进行了参数化研究，涵盖了EN 1999-1-1中考虑的所有类型的失效模式。评估了EN 1999-1-1中规定的等效张力t型桩的设计规范，并强调了规范不准确或潜在不安全的情况。提出了一种对现有设计模型进行简单修正的方法，使最终容量预测更加一致和安全。

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.