Hysteretic behavior of concrete filled thin-walled steel tubular K-joints with spherical-cap gap at chord

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-10 DOI:10.1016/j.tws.2025.113303

Yuxing Yang , Feiyu Liao , Yu Ren , Jian Zhou , Ying Wang

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Abstract

This study presents an experimental and numerical investigation of the hysteretic behavior of concrete filled thin-walled steel tubular K-joints with spherical-cap gaps. Twelve concrete-filled steel tubular (CFST) bottom chord-steel tubular web K-joint specimens were tested under cyclic loading applied to the thin-walled CFST chord. The influence of spherical-cap gap ratios, web-to-chord diameter ratios, and chord diameter-to-thickness ratios on the failure modes, overall structural behavior, load-carrying capacity, stiffness, and ductility was examined. Numerical analyses were conducted to validate the experimental results and perform parametric studies to further investigate the impact of gap ratios, geometry, and material properties on the structural behavior. Additionally, an in-depth analysis of the stress distribution between the web and CFST chord at the K-joint was performed to reveal the influence of spherical-cap gap on the load transfer mechanism. Existing design formulae were calibrated using proposed strength reduction factors to calculate the load-carrying capacity of these K-joints based on different failure modes. The results demonstrate that the presence of spherical-cap gaps can have a detrimental effect on the overall structural integrity. The findings of this study provide valuable insights for the design and safety assessment of thin-walled CFST K-joint connections in buildings and bridges.

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弦端球帽缝薄壁钢管混凝土k形节点滞回特性研究

本文对带有球盖缝隙的薄壁钢管k形节点混凝土的滞回特性进行了试验和数值研究。对12个钢管混凝土底弦-钢管腹板k节点试件进行了薄壁钢管混凝土底弦循环荷载试验。研究了球帽间隙比、腹板与弦径比、弦径与厚度比对破坏模式、整体结构性能、承载能力、刚度和延性的影响。数值分析验证了实验结果，并进行了参数化研究，以进一步研究间隙比、几何形状和材料性能对结构行为的影响。此外，深入分析了k节点腹板与钢管混凝土弦线之间的应力分布，揭示了球帽间隙对荷载传递机制的影响。利用提出的强度折减系数对现有设计公式进行了校正，以计算基于不同破坏模式的这些k形节点的承载能力。结果表明，球帽间隙的存在会对整体结构的完整性产生不利影响。本研究结果为薄壁钢管混凝土k形节点在建筑和桥梁中的设计和安全评估提供了有价值的见解。

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.