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Combined compression-bending-torsion behaviour of CFST columns confined by CFRP for marine structures

机译：CFST柱的组合压缩 - 弯曲行为由CFRP进行海洋结构

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摘要

An innovative composite structural member formed by concrete filled steel tube (CFST) circumferentially confined by carbon fiber-reinforced plastics (CFRP), i.e., referred to as CFRP-CFST, has great potential to be used in marine environment due to its excellent structural performance and corrosion resistance. This paper aims to investigate the behaviour of CFRP-CFST subjected to combined compression-bending-torsion load. Quasi-static tests are conducted on 5 CFRP-CFST members and 3 reference bare CFSTs. The test parameters include the loading scenario (pure torsion, bending-torsion, and compression-bending-torsion), the axial load ratio and the layers of CFRP wrapping. Experimental results show that the CFRP-CFST members exhibit good energy dissipation capacity under pure torsion and compression-bending-torsion loads, while the applied axial force benefits the bearing capacity and the stiffness. However, 'pinch' effect is observed in the load-deformation hysteretic curves of CFRP-CFST under bending-torsion load. It indicates that the confinement provided by CFRP can significantly improve the column bearing capacity and ductility under torsion. When subjected to combined compression-bending-torsion, the CFRP wrapping can effectively improve the column ductility. The energy dissipation capacity increases with multiple CFRP layers. Eventually, the structural mechanism at the ultimate limit state is analyzed, with the calculation methods for the bearing capacities evaluated.
机译：由碳纤维增强塑料（CFRP）周向紧密的混凝土填充钢管（CFST）形成的创新复合结构构件，即CFRP-CFST，由于其优异的结构性能，在海洋环境中具有很大的潜力。耐腐蚀性。本文旨在探讨对组合压缩扭转荷载载的CFRP-CFST的行为。在5个CFRP-CFST成员和3个参考裸CFST上进行准静态试验。测试参数包括加载方案（纯扭转，弯曲和压缩扭转扭转），轴向载荷比和CFRP包装层。实验结果表明，CFRP-CFST成员在纯扭转和压缩扭转负载下表现出良好的能量耗散能力，而施加的轴向力有利于承载力和刚度。然而，在弯曲扭转负荷下，在CFRP-CFST的负载变形滞后曲线中观察到'捏合效果。它表明CFRP提供的限制可以显着提高扭转柱承载力和延展性。当经受组合的压缩弯曲扭转时，CFRP包装可以有效地改善柱延性。能量耗散能力随多个CFRP层增加。最终，分析了最终限位状态的结构机制，并评估了承载能力的计算方法。

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  • 来源
    《Composite Structures》 |2020年第6期|112181.1-112181.19|共19页
  • 作者

    Wang Yu-Hang; Wang Yu-Yan; Hou Chao; Zhou Xu-Hong; Deng Ran; Lan Yong-Sen; Luo Wei; Kong Wei-Bo;

  • 作者单位

    Chongqing Univ Sch Civil Engn Chongqing 400000 Peoples R China|Key Lab New Technol Construct Cities Mt Area Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Civil Engn Chongqing 400000 Peoples R China|Key Lab New Technol Construct Cities Mt Area Chongqing 400045 Peoples R China;

    Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen 518055 Peoples R China|Univ Sydney Sch Civil Engn Sydney NSW 2006 Australia;

    Chongqing Univ Sch Civil Engn Chongqing 400000 Peoples R China|Key Lab New Technol Construct Cities Mt Area Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Civil Engn Chongqing 400000 Peoples R China|Key Lab New Technol Construct Cities Mt Area Chongqing 400045 Peoples R China;

    CSIC HaiZhuang Wind Power Co Ltd Chongqing Peoples R China;

    CSIC HaiZhuang Wind Power Co Ltd Chongqing Peoples R China;

    CSIC HaiZhuang Wind Power Co Ltd Chongqing Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFRP-CFST member; Quasi-static; Combined compression-bending-torsion; Hysteretic curves; Bearing capacity calculation;

    机译：CFRP-CFST成员;准静态;组合压缩弯曲;滞后曲线;承载力计算;

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