FRP-混凝土界面粘结滑移本构模型  

Bond-slip model for FRP-to-concrete interface

作　　者：陆新征[1] 叶列平[1] 滕锦光[2] 庄江波[1] 

机构地区：[1]清华大学土木工程系,北京100084 [2]香港理工大学土木与结构系

出　　处：《建筑结构学报》2005年第4期10-18,共9页Journal of Building Structures

基　　金：国家自然科学基金重点资助项目(50238030);国家自然科学基金对外交流与合作项目(50411130323)。

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。The local fiber reinforced polymer （FRP）-to-concrete bond-slip model is the fundamental relationship to analyse the behavior of FRP-strengtbened RC structures. Due to the peculiarity of the load-bearing mechanism of FRP-to-conerete interface, it is hard to acquire their bond-slip relationship directly from test, so the existing bond-slip constitutive models have more or less unsolved problems. In this paper, a group of new models and the formulas for calculating the debonding strength of interface 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 stiffnesses 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 debonding strength and the strain distribution in the FRP sheet than the existing models.

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 

分 类 号：TU375.02[建筑科学—结构工程]