FRP-混凝土界面粘结滑移关系

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根据界面剥离细观单元分析结果,提出了FRP-混凝土界面剥离的粘结滑移模型

与大量试验结果比较,证明该模型优于现有各设计或分析模型。

指导老师:香港理工大学滕锦光教授,清华大学叶列平、江见鲸教授

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Bond-slip models for FRP sheets/plates externally bonded to concrete.

Engineering Structures. 2005. 27(6) . 920-937

ABSTRACT: An accurate local bond-slip model is of fundamental importance in the modelling of FRP-strengthened RC structures. In this paper, a review of existing bond strength models and bond-slip models is first presented. These models are then assessed using the results of 253 pull tests on simple FRP-to-concrete bonded joints, leading to the conclusion that a more accurate model is required. In the second half of the paper, a set of three new bond-slip models of different levels of sophistication are proposed. A unique feature of the present work is that the new bond-slip models are not based on axial strain measurements on the FRP plate; instead, they are based on the predictions of a meso-scale finite element model, with appropriate adjustment to match their predictions with the experimental results for a few key parameters. Through comparisons with the large test database, all three bond-slip models are shown to provide accurate predictions of both the bond strength (i.e. ultimate load) and the strain distribution in the FRP plate.

KEYWORDS: FRP, concrete, bond, bond-slip models, bond strength, pull tests, finite element simulation, composites

FRP-混凝土界面粘结滑移本构模型
Bond-slip model for FRP- to-concrete interface

建筑结构学报/Journal of Building Structures. 2005. 26(4). 10-18

摘 要:FRP-混凝土界面的粘结滑移关系是FRP加固混凝土结构受力分析的基础。由于FRP-混凝土界面受力情况的特殊性,通常很难通过试验直接获得粘结滑移关系,因而现有的粘结滑移本构模型或多或少存在一些问题。本文根据作者提出的细观单元有限元研究的结果,建议了一组新的界面本构模型以及界面剥离强度计算公式。根据本构模型简化程度不同,分别命名为:精确模型、简化模型和双线性模型。其中精确模型可以考虑不同界面胶层刚度的影响,简化模型和双线性模型则适用于一般界面粘结胶层。通过与大量界面试验结果的对比表明,本文建议的模型可以准确预测界面的剥离强度和剥离过程,且精度优于现有各模型。
关键词:纤维增强复合材料(FRP);界面粘结性能;粘结滑移;剥离强度

Abstract:The local FRP-to-concrete bond-slip model is the fundamental relation to analyse the behaviour of FRP-strengthened RC structures. In this paper, a group of new models are presented based on the predictions of a meso-scale finite element model. These models are named as Precise Model, Simplified Model and Bilinear Model respectively according to different levels of sophistication. Among them, the Precise Model can consider different stiffness of adhesive layer, while Simplified Model and Bilinear Model are suitable for normal adhesive layer. Through comparisons with the large test database, the suggested bond-slip models are shown to provide more accurate predictions of both the bond strength and the strain distribution in the FRP sheet than the existing models.
Keywords:fiber reinforced polymer; interfacial bond; bond-slip model; debonding strength

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极限承载力对比
纤维应变对比
极限承载力对比
纤维应变对比
与所有现有设计或分析模型比较
与所有现有设计或分析模型比较

 

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