Load-carrying mechanism of TOBs bolted steel beam to CFST column joints

IF 4.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI:10.1016/j.jcsr.2025.110150

Min Cai , Houming Yang , Le Liu , Peijun Wang , Youkun Sun

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引用次数: 0

Abstract

The load-carrying mechanism of Thread-fixed One-side Bolts (TOBs) bolted steel beam to Concrete-Filled Steel Tubular (CFST) column joints is rather complex due to the unique anchorage method of TOBs and the interaction between different components. Since this mechanism is challenging to observe directly through experiments, an advanced FE model was developed in this paper to numerically investigate the load-carrying mechanism of TOBs bolted steel beam to CFST column joints, including the failure of hole threads, coordination working between stiffener and column wall, contact pressure on endplate, and stress distribution of core concrete. In addition, a comprehensive parametric analysis was conducted on several parameters, such as installation gaps, concrete strength, stiffener type, and so on. Parametric studies encompassing 29 joint configurations revealed that: 1) Bolt diameter and endplate thickness critically influenced the load-carrying capacity of joints, with improvement by 24.9 % when increasing bolt diameter from M16 to M20 and by 17.35 % when changing endplate thickness from 14 mm to 20 mm; 2) H-shaped stiffener, P-stiffener with vertical rib or transverse rib demonstrated more uniform stress diffusion than polygonal counterpart through enhanced force transmission paths; 3) Spiral wire inserts can restore original capacity in thread-repaired joints by improving load distribution uniformity. Furthermore, the theoretical results and FEM values of yield bending moment for connections were well-matched, with errors no greater than 15 %.

查看原文本刊更多论文

TOBs螺栓连接钢梁与钢管混凝土柱节点的承载机理

螺纹固定单边螺栓（TOBs）连接钢管混凝土柱节点的钢梁，由于其独特的锚固方式和不同构件之间的相互作用，其受力机理较为复杂。由于这种机理难以通过实验直接观察，本文建立了一种先进的有限元模型，对TOBs螺栓钢梁与CFST柱节点的承载机理进行了数值研究，包括孔螺纹破坏、加强筋与柱壁协同工作、端板接触压力以及核心混凝土的应力分布。此外，还对安装间隙、混凝土强度、加劲筋类型等参数进行了全面的参数分析。包含29种节点配置的参数化研究表明：1)螺栓直径和端板厚度严重影响节点的承载能力，当螺栓直径从M16增加到M20时，提高了24.9%，当端板厚度从14 mm增加到20 mm时，提高了17.35%；2) h型加劲肋、竖肋p型加劲肋和横肋p型加劲肋通过增强的力传递路径，表现出比多边形加劲肋更均匀的应力扩散；3)螺旋插丝可以通过提高载荷分布均匀性来恢复螺纹修复接头的原有能力。节点屈服弯矩的理论计算结果与有限元计算结果吻合较好，误差不大于15%。

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

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.