Axial compressive performance of CFRP-steel composite tube confined seawater sea-sand concrete intermediate slender columns

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-07-25 DOI:10.1016/j.conbuildmat.2024.137399

Hao Fu , Jun Tian , Shutong Chen , Chee-Loong Chin , Chau-Khun Ma

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引用次数: 0

Abstract

To alleviate the scarcity of river sand resources and fully utilize the advantages of Carbon Fiber Reinforced Polymer (CFRP), a new type of CFRP-steel composite tube was developed to confine seawater-sea sand concrete (FCTSSC) column structures. This study conducted experimental research on FCTSSC intermediate slender columns for the first time, analyzing their failure modes and working mechanisms. The investigation explored the effects of outer CFRP layers and slenderness ratios on the mechanical performance. The results indicate that the FCTSSC intermediate slender column specimens exhibited global buckling accompanied by local bulging of steel tubes as their failure mode. The load-displacement curves can be divided into strong confinement and weak confinement models. Specimens confined by CFRP exhibited a 12.51–31 % increase in ultimate bearing capacity. The ultimate bearing capacity and its enhancement rate were positively correlated with the outer CFRP layers and negatively correlated with the slenderness ratio. Peak lateral displacements were positively correlated with both parameters. Finally, the model for calculating the axial compression ultimate bearing capacity of FCTSSC intermediate slender columns was proposed, providing a reference for future practical applications in offshore engineering.

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海水海砂混凝土中间细长柱 CFRP 钢复合管的轴向抗压性能

为缓解河砂资源匮乏的问题，充分利用碳纤维增强聚合物（CFRP）的优势，开发了一种新型碳纤维增强聚合物-钢复合管，用于约束海水-海砂混凝土（FCTSSC）柱结构。本研究首次对 FCTSSC 中间细长柱进行了实验研究，分析了其失效模式和工作机制。研究探讨了 CFRP 外层和细长率对力学性能的影响。结果表明，FCTSSC 中间细长柱试样的失效模式为整体屈曲，同时伴有钢管的局部隆起。荷载-位移曲线可分为强约束模型和弱约束模型。采用 CFRP 约束的试样极限承载力提高了 12.51%-31%。极限承载力及其提高率与 CFRP 外层呈正相关，与细长比呈负相关。峰值侧向位移与这两个参数呈正相关。最后，提出了 FCTSSC 中间细长柱轴向压缩极限承载力的计算模型，为今后海上工程的实际应用提供了参考。

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

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.