Semi-empirical models for predicting mode-II bond indicators between FRP and concrete

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-03-01 DOI:10.1680/jmacr.22.00290

Nasser Al-Huthaifi, R. Haddad

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引用次数: 0

Abstract

The bond behavior between fiber-reinforced polymer (FRP) composites and concrete is a complex problem that is influenced by material properties, joint geometric configuration and the surrounding environment. The three fundamental bond-performance indicators of concern are interfacial fracture energy, bond-strength and debonding strain. This paper introduces a new semi-empirical model for predicting interfacial fracture energy (Gf) between externally bonded FRP and intact concrete in terms of the most influential material and geometric parameters; namely, concrete's compressive strength and maximum aggregate size, stiffness of FRP composites and bond width and length of FRP composites relative to the dimensions of the concrete member. The prediction of (Gf) helped generate accurate predictions for the other two bond-performance indicators. The present model was developed using non-linear regression analysis before validation using almost a one-third of the total database consisting of 425 points, collected from credible publications. The accuracy of the present model of (Gf) outperformed those of well-known literature ones. The excellent agreement in trend behavior of the present model with those reported in related literature works postulated further the model's validity. The estimation of debonding strain and bond-strength in terms of fracture energy demonstrated superior accuracy over those provided by different relevant literature models.

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预测FRP与混凝土ii型粘结指标的半经验模型

纤维增强聚合物（FRP）复合材料与混凝土之间的粘结行为是一个复杂的问题，受材料性能、接头几何形状和周围环境的影响。值得关注的三个基本粘结性能指标是界面断裂能、粘结强度和脱粘应变。本文介绍了一种新的半经验模型，用于根据最具影响的材料和几何参数预测外粘结FRP和完整混凝土之间的界面断裂能（Gf）；即混凝土的抗压强度和最大骨料尺寸、FRP复合材料的刚度以及FRP复合材料相对于混凝土构件尺寸的粘结宽度和长度。（Gf）的预测有助于对其他两个债券表现指标产生准确的预测。本模型是在验证前使用非线性回归分析开发的，使用了从可信出版物中收集的425个点组成的总数据库的近三分之一。目前的（Gf）模型的准确性优于著名文献中的模型。本模型的趋势行为与相关文献中报道的趋势行为非常一致，进一步证明了该模型的有效性。根据断裂能对脱粘应变和粘结强度的估计显示出优于不同相关文献模型提供的精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.