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Bond behavior between near-surface mounted fiber reinforced polymer strips and concrete using nonlinear finite element: a parametric study
Journal of Adhesion Science and Technology ( IF 2.3 ) Pub Date : 2020-12-07
Rami Haddad, Emad Al-Rabadi

Abstract

A nonlinear finite element (NLFE) model is proposed to predict the bond behavior between concrete and near-surface mounted (NSM) fiber-reinforced polymer (FRP). The model is validated, based on the results from an experimental program carried out by the present authors, before being employed to generate a wide range of data considering key parameters, such as grooves spacing (50–200 mm), and embedment length (50–300 mm), and fiber type (basalt and carbon) of the NSM FRP strips as well as concrete's strength (25–55 MPa). The impact of steel reinforcement is also evaluated. The findings demonstrate a significant impact of NSM FRP strips' type, embedment length, and grooves' spacing on bond behavior. The higher-strength grade for concrete imparted noticeable improvements in bond characteristics, whereas the presence of steel reinforcement seems to enhance the pull-out force slightly by as much as 15% yet reduce bond ductility. The NLFE cracking patterns are used to help understand the influence of different parameters on bond failure mode between the NSM FRP strips and concrete.



中文翻译:

近表面安装的纤维增强聚合物条与混凝土之间的粘结行为,采用非线性有限元:参数研究

摘要

提出了一种非线性有限元(NLFE)模型来预测混凝土与近表面贴装(NSM)纤维增强聚合物(FRP)之间的粘结行为。该模型基于当前作者进行的实验程序的结果进行了验证,然后用于考虑关键参数(例如凹槽间距(50-200 mm)和嵌入长度(50))生成广泛的数据–300毫米),NSM FRP条的纤维类型(玄武岩和碳)以及混凝土的强度(25–55 MPa)。还评估了钢筋的影响。研究结果表明,NSM FRP胶条的类型,嵌入长度和凹槽间距对粘结行为具有重大影响。混凝土的高强度等级显着改善了粘结特性,而钢筋的存在似乎可以将拉拔力略微提高15%,但却降低了粘结延展性。NLFE裂纹模式用于帮助理解NSM FRP条和混凝土之间不同参数对粘结破坏模式的影响。

更新日期:2020-12-07
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