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首页> 外文期刊>Composite Structures >Rate-dependent compressive behavior of concrete confined with Large-Rupture-Strain (LRS) FRP
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Rate-dependent compressive behavior of concrete confined with Large-Rupture-Strain (LRS) FRP

机译：混凝土的速率依赖压缩行为局限于大破裂 - 菌株（LRS）FRP

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摘要

The polyethylene naphthalene (PEN) and polyethylene terephthalate (PET) fibers have a tensile rupture strain of over 5%, and hence they are referred to as large-rupture-strain (LRS) fiber reinforced polymer (FRP) materials. Their large rupture strain characteristics may contribute to significant improvement of the impact resistance of reinforced concrete (RC) structures. This study investigates the strain rate effect on LRS FRP-confined concrete through Split Hopkinson Pressure Bar (SHPB) test. Results revealed that LRS FRP-confined concrete specimens exhibited superior impact resistance behaviors compared to the counterpart confined with CFRP composites when subjected to a single impact. The critical strain, compressive strength and toughness of the LRS FRP-confined concrete specimen increased with increasing strain rate. Due to the large rupture strain characteristics, the LRS FRP-confined concrete specimen virtually had no visible damage after a single impact. To study the damage evolution mechanism of concrete, the specimens were impacted for multiple times with the same energy until the failure of the specimen. Due to progressive concrete damage, the dynamic compressive strength and toughness experienced a decrease during multiple impacts. These findings might promote the application of LRS FRP materials in the field of impact resistance design of RC structures as a promising external jacketing material.
机译：聚乙烯萘（笔）和聚对苯二甲酸乙二醇酯（PET）纤维的拉伸破裂菌株超过5％，因此它们被称为大破裂 - 菌株（LRS）纤维增强聚合物（FRP）材料。它们的大破裂应变特性可能有助于钢筋混凝土（RC）结构的抗冲击性的显着改善。本研究通过分裂霍普金森压力棒（SHPB）测试研究了对LRS FRP限制混凝土的应变速率效应。结果表明，与在受到单一冲击时局限于CFRP复合材料时，LRS FRP限制混凝土试样呈现出优异的抗冲击性行为。随着应变率的增加，LRS FRP限制混凝土样本的临界应变，抗压强度和韧性增加。由于具有大的破裂应变特性，LRS FRP限制混凝土样本在一次冲击后几乎没有明显的损坏。为了研究混凝土的损伤演化机制，试样对试样失效的相同能量影响了多次。由于渐进的混凝土损坏，动态抗压强度和韧性在多次冲击期间经历了降低。这些调查结果可能促进LRS FRP材料在RC结构的抗冲击设计领域中的应用，作为一个有前途的外部护套材料。

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  • 来源
    《Composite Structures》 |2021年第9期|114199.1-114199.15|共15页
  • 作者

    Yan Zhi-Wei; Bai Yu-Lei; Ozbakkaloglu Togay; Gao Wan-Yang; Zeng Jun-Jie;

  • 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;

    Texas State Univ Ingram Sch Engn San Marcos TX USA;

    Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 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

    LRS FRP-confined concrete; Repeated impact; SHPB; Strain rate effect;

    机译：LRS FRP限制混凝土;反复影响;SHPB;应变率效应;

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