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Size effect on axial compressive failure of CFRP-wrapped square concrete columns: Tests and simulations

机译：CFRP包装方形混凝土柱轴压抗压失效的尺寸效应：测试和仿真

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摘要

Carbon Fiber Reinforced Polymer (CFRP) has been widely utilized to wrap concrete column in order to improve the axial compressive bearing capacity. In this study, the size effect of CFRP-wrapped square concrete columns was investigated using both experimental and numerical approaches. A total of 30 geometrically-similar CFRP-wrapped concrete columns with a maximum cross-sectional width of 600 mm were designed and tested with repeated axial compression. The influences of loading type, structural size and reinforcement configuration on the failure of the columns were explored and measured. Moreover, a 3D meso-scale simulation approach considering the influence of concrete heterogeneity and CFRP-concrete interactions was utilized to furtherly investigate the size effect of CFRP-wrapped columns. In the 3D meso-scale simulations, the failure of columns with larger structural sizes and larger CFRP fiber ratios was analyzed. The size effect on the nominal compressive strength of CFRP-wrapped columns was examined and discussed in detail. Finally, an updated size effect law (SEL) was established to describe the size effect in CFRP-wrapped concrete columns. The updated SEL is proved to be reasonable, which shows good consistence with the present experimental data and simulation results.
机译：碳纤维增强聚合物（CFRP）已广泛用于包装混凝土柱以改善轴向压缩承载力。在这项研究中，使用实验和数值方法研究了CFRP包裹的方形混凝土柱的尺寸效应。设计和测试了最大横截面宽度为600mm的30个几何类似的CFRP包装的混凝土柱，重复轴向压缩。探索和测量负载型，结构尺寸和增强配置对柱的失效的影响。此外，考虑了考虑混凝土异质性和CFRP - 混凝土相互作用的影响的3D中型尺度模拟方法，进一步研究了CFRP包装柱的尺寸效应。在3D中级模拟中，分析了结构尺寸较大和较大的CFRP纤维比的柱的失效。检查并详细讨论了对CFRP包裹柱的标称抗压强度的尺寸效应。最后，建立了更新的大小效应法（SEL）以描述CFRP包装混凝土柱中的尺寸效应。已证明更新的SEL是合理的，其与本实验数据和仿真结果呈现出良好的一致性。

著录项

  • 来源
    《Composite Structures》 |2020年第12期|112843.1-112843.19|共19页
  • 作者

    Jin Liu; Chen Huiming; Wang Zuohu; Du Xiuli;

  • 作者单位

    Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing Peoples R China;

    Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing Peoples R China;

    Beijing Univ Civil Engn & Architecture Sch Civil & Transportat Engn Beijing Peoples R China;

    Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing 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-wrapped concrete columns; Size effect; Fiber ratio; Nominal compressive strength; Meso-scale simulations;

    机译：CFRP包装的混凝土柱;尺寸效果;光纤比;标称抗压强度;中音尺度模拟;

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