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首页> 外文期刊>Composite Structures >A new discrete method to model unidirectional FRP-to-parent material bonded joints subjected to mechanical loads
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A new discrete method to model unidirectional FRP-to-parent material bonded joints subjected to mechanical loads

机译：一种新的离散方法来模拟承受机械载荷的单向FRP到母材粘结接头

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摘要

Nowadays fiber reinforced polymer (FRP) composites play an important role in the strengthening of structures. Different methods can be used to apply these materials: the externally bonded reinforcement (EBR), and the near surface mounted (NSM) using strips and NSM rods. There are only a few studies comparing these methods or presenting an efficient model to simulate these strengthening techniques. This study looks mainly at the analysis of the interface between FRP-to-parent material bonded joints. The paper examines, through a new discrete model based on axial and shear springs, the performance of FRP-to-parent material bonded joints for EBR or NSM techniques using strips or composite rods. In order to implement the model a routine in MATLAB was developed and several bond-slip curves were assumed. The results revealed that load-slip curves or bond stresses, strains or slippages along the bonded length obtained from several bond-slip curves are similar to the analytical and other numerical solutions found in literature. In what concerns the adhesion between two different materials, and assuming the same bond characteristics for the three fiber strengthening techniques, the NSM system using FRP strips had the highest maximum load transmitted to the FRP strip combined with the lowest effective bond length. The results obtained from the proposed model were also very accurate with that-obtained from an analytical solution found in literature that simulates the debonding phenomenon of FRP-to-concrete interfaces between to adjacent cracks. (C) 2014 Elsevier Ltd. All rights reserved.
机译：如今，纤维增强聚合物（FRP）复合材料在增强结构方面起着重要作用。可以使用不同的方法来应用这些材料：外部结合的增强材料（EBR），以及使用条和NSM杆的近表面安装（NSM）。只有很少的研究比较这些方法或提出一个有效的模型来模拟这些强化技术。这项研究主要着眼于FRP与母材粘结接头之间的界面分析。本文通过基于轴向和剪切弹簧的新离散模型，研究了使用条形或复合杆的EBR或NSM技术的FRP到母材粘结接头的性能。为了实现该模型，在MATLAB中开发了一个例程，并假定了多个粘结滑移曲线。结果表明，从几条粘结-滑动曲线获得的载荷-滑动曲线或粘结应力，沿粘结长度的应变或滑移与文献中的解析解和其他数值解相似。考虑到两种不同材料之间的粘合性，并假设三种纤维增强技术具有相同的粘合特性，使用FRP胶条的NSM系统具有最高的最大载荷传递至FRP胶条，同时具有最低的有效粘合长度。从建议的模型获得的结果也非常准确，与文献中的分析解决方案所获得的结果相似，该解决方案模拟了FRP到相邻裂缝之间的混凝土界面的剥离现象。 （C）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2015年第3期|280-295|共16页
  • 作者

    Biscaia Hugo C.; Chastre Carlos; Viegas Andre;

  • 作者单位

    Univ Nova Lisboa, UNIC, Fac Ciencias & Tecnol, P-2829516 Caparica, Portugal;

    Univ Nova Lisboa, UNIC, Fac Ciencias & Tecnol, P-2829516 Caparica, Portugal;

    Univ Nova Lisboa, Fac Ciencias & Tecnol, P-2829516 Caparica, Portugal;

  • 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; Bond; Concrete; Steel; Discrete modeling;

    机译：玻璃钢;粘结;混凝土;钢;离散建模;

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