Advance in improving flexural performance of FRP-concrete-stainless steel double-skin tube (FCSDST) with distinct CFRP ply stacking arrangement

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

Composite Structures Pub Date : 2025-08-23 DOI:10.1016/j.compstruct.2025.119612

Zhenyu Huang , Yiwei Wang , Peng Wang , Yingwu Zhou

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引用次数: 0

Abstract

FRP-concrete-stainless steel double-skin tube (FCSDST) has been increasingly utilized in marine structures due to its excellent corrosion resistance and superior structural performance. To qualitatively and quantitatively uncover the effects of FRP lay-up configurations on flexural strength and displacement ductility of FCSDST, this study comprehensively investigates the flexural behavior of FCSDST featuring distinct carbon fiber reinforced polymer (CFRP) ply stacking sequences. Experimental outcomes indicate that FCSDSTs with a complex stacking sequence ([90/±15/90/±45₃]_n) achieve higher flexural strength and stiffness by 56 % and 45 %, respectively, than those with a ±45° configuration ([±45]_n). This enhancement results from the superior tensile capacity of smaller-angle fiber plies. In contrast, the ±45° lay-up shows 15 % higher displacement ductility due to stress redistribution mechanism in the tensile zone arising from matrix plastic flow and fiber reorientation. Numerical simulation results demonstrate that damage initiates at the loading point with local FRP buckling, followed by cracking of ULCC and yielding of steel tube, while the flexural failure eventually occurs due to the tensile rupture of FRP tube. A sectional integration-based model is also proposed to predict the flexural strength capacity, considering the strength of ultra-lightweight cementitious composite (ULCC) under triaxial compression and the confinement effects of CFRP with various thicknesses.

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不同碳纤维布叠层结构frp -混凝土-不锈钢双皮管（FCSDST）抗弯性能改善研究进展

frp -混凝土-不锈钢双皮管（FCSDST）由于其优异的耐腐蚀性能和优越的结构性能，在海洋结构中得到越来越多的应用。为了定性和定量地揭示FRP铺设构型对FCSDST抗弯强度和位移延性的影响，本研究全面研究了具有不同碳纤维增强聚合物（CFRP）铺设顺序的FCSDST的抗弯行为。实验结果表明，具有复杂堆叠顺序（[90/±15/90/±453]n）的FCSDSTs的抗弯强度和刚度分别比具有±45°配置（[±45]n）的FCSDSTs高56%和45%。这种增强是由于小角度纤维层具有优越的拉伸能力。相比之下，由于基体塑性流动和纤维重定向引起的拉伸区应力重分布机制，±45°铺层的位移延性提高了15%。数值模拟结果表明，损伤始于加载点，局部FRP屈曲，随后ULCC开裂，钢管屈服，最终FRP管拉伸破裂导致弯曲破坏。考虑超轻质胶凝复合材料（ULCC）在三轴压缩下的强度和不同厚度CFRP的约束效应，提出了基于截面积分的抗弯承载力预测模型。

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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.