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首页> 外文期刊>Composite Structures >Stiffness-based design-oriented compressive stress-strain model for large-rupture-strain (LRS) FRP-confined concrete
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Stiffness-based design-oriented compressive stress-strain model for large-rupture-strain (LRS) FRP-confined concrete

机译：大刚度FRP约束混凝土基于刚度的设计导向压应力应变模型

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摘要

Large rupture strain fiber-reinforced polymers (LRS FRPs) (e.g., with an elongation larger than 5%) provide ideal confinement for seismic retrofit of concrete columns. Most of existing design-oriented models for FRP-confined concrete define the slope of axial stress-strain curve (i.e., axial stiffness) as a function of FRP's rupture strain. Consequently, concrete confined with FRP of the same jacket stiffness but different rupture strains usually lead to different axial stiffnesses, which is contrary to the experimental observations. For LRS FRP-confined concrete a slight deviation in the axial stiffness might cause significant error in predicting its ultimate state. Therefore, a design-oriented model is developed here to define axial stiffness using the jacket stiffness rather than its rupture strain. 26 LRS FRP-confined circular concrete cylinders are tested and added to a database of 36 existing specimens. Then an existing lateral-to-axial strain (dilation) relationship is upgraded based on the above database and a database on 113 conventional FRP-confined concrete cylinders. A three-fold approach is employed to define the full-range stress-strain relation of LRS FRP-confined concrete as a function of jacket stiffness. The proposed stiffness-based design-oriented model predicts both softening and hardening behaviors and is applicable to both conventional and LRS FRP-confined concrete columns.
机译：大型断裂应变纤维增强聚合物（LRS FRP）（例如，伸长率大于5％）为混凝土柱的抗震改造提供了理想的限制。 FRP约束混凝土的大多数现有的面向设计的模型都将轴向应力-应变曲线的斜率（即轴向刚度）定义为FRP断裂应变的函数。因此，受FRP约束的混凝土具有相同的护套刚度，但不同的断裂应变通常会导致不同的轴向刚度，这与实验观察相反。对于LRS FRP约束混凝土，轴向刚度的轻微偏差可能会在预测其最终状态时引起重大错误。因此，此处开发了一种面向设计的模型，以使用护套刚度而不是其破裂应变来定义轴向刚度。测试了26个LRS FRP约束的圆形混凝土圆柱体，并将其添加到包含36个现有样本的数据库中。然后，基于上述数据库和有关113个常规FRP约束混凝土圆柱的数据库，升级了现有的横向到轴向应变（膨胀）关系。采用三重方法来定义LRS FRP约束混凝土的全范围应力-应变关系，作为护套刚度的函数。所提出的基于刚度的面向设计的模型可以预测软化和硬化行为，并且适用于常规和LRS FRP约束的混凝土柱。

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  • 来源
    《Composite Structures》 |2019年第9期|110953.1-110953.18|共18页
  • 作者

    Bai Yu-Lei; Dai Jian-Guo; Mohammadi Mohsen; Lin Guan; Mei Shi-Jie;

  • 作者单位

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China|Beijing Univ Technol, Beijing Hist Bldg Protect Engn Technol Res Ctr, Beijing, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China;

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China|Beijing Univ Technol, Beijing Hist Bldg Protect Engn Technol Res Ctr, 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

    FRP; Confinement; Large rupture strain (LRS); Axial stiffness; Stress-strain model;

    机译：FRP;约束;大断裂应变（LRS）;轴向刚度;应力应变模型;

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