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Axial compressive behavior and confinement mechanism of circular FRP-steel tubed concrete stub columns

机译：圆形FRP-钢管混凝土柱轴向压缩行为及监禁机理

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摘要

Fiber-reinforced polymer (FRP)-steel tubed concrete (FSTC) columns have emerged as a new type of compression members. An experimental program was performed to further demonstrate the axial compressive behavior of FSTC stub columns and to clarify the confinement mechanism in such members. The test results showed that the capacities of the axially loaded FSTC specimens were enhanced with the increase of the FRP confinement and the decrease of the steel tube's diameter-to-thickness (D/t) ratio. After deducting the steel tube's axial bearing contribution through elastic-plastic analysis, the concrete cores' axial load-strain responses had a bilinear shape, which was very similar to the axial load-strain responses of the composite columns. Based on the comparison between steel confinement and FRP confinement, a confinement mechanism was proposed to reveal the interaction between the inner concrete core and the outer FRP-steel composite tube. It was divided into three stages: domination of steel confinement, domination of FRP-steel dual confinement, and domination of FRP confinement. The total confining pressure at the third stage could be considered as a translational motion of the FRP confining pressure, which explained why the second stiffness of the confined concrete was more sensitive to the FRP confinement stiffness than the steel confinement.
机译：纤维增强聚合物（FRP）-Steel管混凝土（FSTC）柱作为一种新型的压缩构件。进行实验程序以进一步证明FSTC柱柱的轴向压缩行为，并阐明这些构件中的限制机构。测试结果表明，随着FRP限制的增加和钢管直径至厚度（D / T）比率的增加，轴向装载的FSTC样本的容量增强。在通过弹性塑性分析扣除钢管的轴向轴承贡献之后，混凝土芯的轴向载荷 - 应变响应具有双线性形状，其与复合柱的轴向载荷应答响应非常相似。基于钢监禁与FRP限制的比较，提出了一种限制机理，揭示内部混凝土芯与外玻璃钢复合管之间的相互作用。它分为三个阶段：钢结构统治，统治FRP - 钢双限制，以及FRP限制的统治。第三阶段的总限制压力可以被认为是FRP限制压力的平移运动，这解释了为什么密闭混凝土的第二刚度对FRP限制刚度比钢禁止更敏感。

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  • 来源
    《Composite Structures》 |2021年第1期|113082.1-113082.13|共13页
  • 作者

    Wang Yanlei; Chen Guipeng; Wan Baolin; Han Baoguo; Ran Jianghua;

  • 作者单位

    Dalian Univ Technol Sch Civil Engn State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Civil Engn State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China;

    Marquette Univ Dept Civil Construct & Environm Engn Milwaukee WI 53201 USA;

    Dalian Univ Technol Sch Civil Engn State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Civil Engn State Key Lab Coastal & Offshore Engn Dalian 116024 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

    Fiber-reinforced polymer (FRP); Compressive behavior; Confined concrete; Confinement mechanism; Steel tube;

    机译：纤维增强聚合物（FRP）;压缩行为;紧孔混凝土;限制机构;钢管;

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