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首页> 外文期刊>Materials and structures >Compressive behavior of large rupture strain (LRS) FRP-confined square concrete columns: experimental study and model evaluation
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Compressive behavior of large rupture strain (LRS) FRP-confined square concrete columns: experimental study and model evaluation

机译：大破裂菌株（LRS）FRP限制方形混凝土柱的压缩行为：实验研究与模型评价

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摘要

A large rapture strain (LRS) fiber reinforced polymer (FRP), with a rupture strain value of more than 5%, is a promising alternative to traditional FRPs with a 1-3% rupture strain for seismic retrofitting of reinforced concrete (RC) structures. The LRS FRPs provide a bilinear stiffness around concrete columns while this feature is linear for traditional FRPs (e.g., carbon FRP). This paper presents a careful analysis of the compressive behavior of LRS FRP wrapped square column, especially since their confining stress is nonuniformly distributed. A total of 66 square concrete columns, measuring 150 × 150 × 300 mm with varied corner radii from 0 to 75 mm were tested under monotonic axial compression. The experimental results, in terms of full stress-strain behavior, compressive strength, hoop strain distribution, and dilation behavior were systematically investigated. As the corner radius increases, the strength enhancement after LRS FRP confinement also increases, and the hoop strain is more uniformly distributed. The stress-train curves exhibit a triple-section pattern with a smooth transition zone. The peak dilation rate of LRS FRP-confined concrete is higher than that of traditional FRP-confined concrete, and the curve of dilation rate versus axial strain exhibits a remarkably long stable response. Moreover, results show that most existing models of FRP-confined concrete can provide conservative predictions for an improved compressive strength of LRS FRP-confined square concrete columns.
机译：一个大的Razture菌株（LRS）纤维增强聚合物（FRP），破裂应变值超过5％，是传统FRPS的有希望的替代品，具有1-3％的钢筋混凝土（RC）结构的地震改装破裂菌株。 LRS FRPS在混凝土柱周围提供双线性刚度，而该特征是传统FRPS的线性（例如，碳FRP）。本文仔细分析了LRS FRP包装方柱的压缩行为，特别是因为它们的限制应力是不均匀的分布。在单调的轴向压缩下测试了总共66个方形混凝土柱，测量了150×150×300 mm，从0到75 mm的变化半径进行测试。在系统研究了全应力 - 应变行为，抗压强度，箍应变分布和扩张行为方面的实验结果。随着拐角半径的增加，LRS FRP限制后的强度增强也会增加，并且箍菌株更均匀分布。压力列车曲线表现出具有平滑过渡区的三段图案。 LRS FRP限制混凝土的峰值扩张速率高于传统的FRP限制混凝土的峰值，并且扩张速率与轴向应变的曲线表现出显着长的稳定反应。此外，结果表明，最现有的FRP限制混凝土模型可以为LRS FRP限制方形混凝土柱的改进的抗压强度提供保守预测。

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  • 来源
    《Materials and structures》 |2020年第4期|99.1-99.20|共20页
  • 作者

    Qiang Han; Wanying Yuan; Yulei Bai; Xiuli Du;

  • 作者单位

    Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing China;

    Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing China;

    Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing China;

    Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing 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); Large rapture strain (LRS); Confinement; Square column; Compressive behavior;

    机译：纤维增强聚合物（FRP）;大的Razture菌株（LRS）;限制;方柱;压缩行为;

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