Behaviors and load distribution of sleeved bolted joints between pultruded FRP box profiles with multi-directional fiber layups

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-17 DOI:10.1016/j.compstruct.2025.119673

Mengdie Liang , Xin Wang , Xinyan Yuan , João R. Correia , Zhishen Wu

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引用次数: 0

Abstract

Pultruded fiber-reinforced polymer (PFRP) composites have recently garnered significant attention for truss structures. However, the low connection efficiency and inherent brittleness of traditional PFRP profiles, with mostly unidirectional (UD) reinforcement, pose critical challenges that limit their structural applications. This study presents experimental and numerical investigations about the tensile performance of bolted sleeved joints between PFRP box profiles with multi-directional (MD) fiber layups, aiming to explore effective strategies for enhancing joint connection efficiency. The studied parameters included bolt layout, fiber layup, end distance and bolt spacing. Results indicate that the incorporation of MD fiber layups can improve the joint strength of the bolted sleeved joints by 90 %. Moreover, arranging the bolts to pass through all four walls of the box profile mitigated the uneven load distribution among bolts, thereby improving connection efficiency without requiring additional bolts or increased connection length compared to joints where bolts were arranged passing only through two walls. Increasing bolt spacing proved more effective in enhancing ultimate load than adjusting end distance. For engineering applications, it is recommended that bolt spacing exceeds five times the bolt diameter in order to guarantee pin-bearing failure.

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多方向纤维层拉挤玻璃钢箱型间套筒螺栓连接性能及荷载分布

近年来，拉挤纤维增强聚合物（PFRP）复合材料在桁架结构中的应用受到了广泛的关注。然而，传统PFRP型材的连接效率低、固有脆性，且大多采用单向（UD）加固，这对其结构应用构成了重大挑战。本文通过实验和数值研究了PFRP箱体型材间多方向纤维层连接螺栓套接接头的拉伸性能，旨在探索提高连接效率的有效策略。研究的参数包括螺栓布放、纤维铺设、端距和螺栓间距。结果表明，MD纤维层的掺入可使螺栓套接接头的强度提高90%。此外，将螺栓布置为穿过箱体型线的所有四个壁，减轻了螺栓之间的载荷分布不均匀，从而提高了连接效率，而不需要额外的螺栓或增加连接长度，而不是将螺栓布置为只穿过两个壁。增加锚杆间距比调整锚杆端距更能有效地提高极限荷载。对于工程应用，建议螺栓间距超过螺栓直径的五倍，以保证销轴承的失效。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.