Analysis and comparison on the mechanical behaviors of original bolt-column (OBC) joint and improved bolt-column (IBC) joint

Q1 Arts and Humanities

International Journal of Space Structures Pub Date : 2024-03-06 DOI:10.1177/09560599241234801

Zhicheng Xiao, Jingxuan Peng, Chengxin Li, Gengwang Yan, Huijun Li

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引用次数: 0

Abstract

In this study, OBC joint is improved by incorporating one web, two flanges, and two additional bolts, putting forward a novel semi-rigid joint referred to as IBC joint. Finite element models of both OBC and IBC joints are established and the former is validated based on previous research. Subsequently, a total of 84 numerical models is utilized to investigate and compare the mechanical behaviors of OBC and IBC joints, taking into account different thicknesses of side plate and flange as wll as various loading conditions. The numerical results indicate that: (I) in comparison to OBC joints, the IBC joints exhibit significant enhancements in strong axis bending performance and axial tensile performance, including average enhancement ratios of 48%, 67%, 44%, and 19% in initial strong axis bending stiffness, ultimate strong axis bending moment, initial tensile stiffness and ultimate tension, respectively; (II) compared to OBC joints, the IBC joints demonstrate reduced capacity in axial torsional resistance and axial compressive performance, with mean decline ratios of 54%, 39%, 14%, and 7% in initial torsional stiffness, ultimate torque, initial compressive stiffness and ultimate compression, respectively; (III) OBC joints have better weak axis bending performance compared to IBC joints, but this gap decreases remarkably with increasing thicknesses of side plate and flange; (IV) the initial out-of-plane shear stiffness and ultimate out-of-plane shear of the IBC joint exhibit average enhancement of approximately 20% and 10%, respectively, when compared to those of the OBC joint; (V) regarding in-plane shear performance, the initial stiffness of IBC joints exceeds that of OBC joints by an average ratio of 61%, while IBC joints with flange thickness over 10 mm demonstrate significant improvement in ultimate capacity; (VI) The mechanical performance of OBC and IBC joints shows varying degrees of improvement with an increase in the thicknesses of side plate and flange.

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原始螺栓-柱 (OBC) 连接和改进螺栓-柱 (IBC) 连接的机械性能分析与比较

在本研究中，通过加入一个腹板、两个法兰和两个附加螺栓，对 OBC 接头进行了改进，提出了一种新型半刚性接头，即 IBC 接头。本研究建立了 OBC 和 IBC 接头的有限元模型，并在先前研究的基础上对前者进行了验证。随后，共利用 84 个数值模型研究和比较了 OBC 和 IBC 接头的机械性能，同时考虑了不同厚度的侧板和翼缘板以及各种加载条件。数值结果表明(I) 与 OBC 接头相比，IBC 接头的强轴弯曲性能和轴向拉伸性能显著增强，包括初始强轴弯曲刚度、极限强轴弯曲力矩、初始拉伸刚度和极限拉伸的平均增强率分别为 48%、67%、44% 和 19%；(II) 与 OBC 接头相比，IBC 接头的轴向抗扭性能和轴向抗压性能有所下降，在初始抗扭刚度、极限扭矩、初始抗压刚度和极限抗压方面的平均下降率分别为 54%、39%、14% 和 7%；(IV) 与 OBC 接头相比，IBC 接头的初始平面外剪切刚度和极限平面外剪切力分别平均提高了约 20% 和 10%；(V) 在平面内剪切性能方面，IBC 接头的初始刚度比 OBC 接头平均高出 61%，而法兰厚度超过 10 毫米的 IBC 接头在极限承载能力方面有显著改善； (VI) 随着侧板和法兰厚度的增加，OBC 和 IBC 接头的机械性能有不同程度的改善。

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

International Journal of Space Structures Arts and Humanities-Conservation

CiteScore

2.00

自引率

0.00%

发文量

期刊介绍： The aim of the journal is to provide an international forum for the interchange of information on all aspects of analysis, design and construction of space structures. The scope of the journal encompasses structures such as single-, double- and multi-layer grids, barrel vaults, domes, towers, folded plates, radar dishes, tensegrity structures, stressed skin assemblies, foldable structures, pneumatic systems and cable arrangements. No limitation on the type of material is imposed and the scope includes structures constructed in steel, aluminium, timber, concrete, plastics, paperboard and fabric.