Experimental investigation on mechanical behavior of grout-filled pultruded FRP multi-cavity profiles

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

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-04-23 DOI:10.1016/j.compstruct.2026.120369

Hu Feng, Shenghao Lu, Xiaoli Wei, Xuhui Geng, Chang Su, Yuyang Pang

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引用次数: 0

Abstract

FRP (Fiber Reinforced Polymer) are ideal materials for improving the strength and ductility of existing concrete structures, but its susceptibility to buckling limit its use in compression-bearing part. In this work, a particular kind of composite member is developed by grouting into the pultruded FRP multi-cavity profile. The internal grouting material is used to ensure compressive stability while the external FRP profile is used to provide high tensile strength and a degree of confinement to the internal grout. Ten FRP profiles are designed, and the mechanical performances of two-cavity and three-cavity grout-filled pultruded FRP profiles are experimentally investigated. The testing results show that the type of fiber, the direction of fabric mesh and the content of fiber have an influence on the tensile properties of the profile sheet. Compared to the two-cavity profile, the three-cavity grout-filled FRP profile has higher compressive strength. The three-cavity grout-filled FRP profile with the combination of the outer two layers of ± 45° glass fiber fabric and the inner one layer of ± 45° glass fiber fabric has the best compressive performance. The calculation formulas of tensile and compressive bearing capacity are proposed, the confinement effect of multi-cavity FRP profiles is quantified by a confinement enhancement coefficient.

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注浆填充玻璃钢多腔型材力学性能试验研究

FRP （Fiber Reinforced Polymer，纤维增强聚合物）是提高现有混凝土结构强度和延性的理想材料，但其易发生屈曲的特性限制了其在受压构件中的应用。本文将一种特殊的复合构件灌浆于拉挤FRP多腔型材中。内部注浆材料用于确保抗压稳定性，而外部FRP型材用于提供高抗拉强度和对内部注浆的一定程度的约束。设计了10种FRP型材，对两腔和三腔注浆填充拉伸FRP型材的力学性能进行了试验研究。试验结果表明，纤维种类、织物网格方向和纤维含量对型材的拉伸性能有影响。与双腔型相比，三腔注浆型FRP型材具有更高的抗压强度。外两层±45°玻璃纤维织物、内一层±45°玻璃纤维织物组合的三腔灌浆型玻璃钢型材抗压性能最佳。提出了拉伸和压缩承载力的计算公式，用约束增强系数量化了多腔FRP型材的约束效应。

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

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.