中低速荷载下FRP与混凝土界面本构模型开发  

Constitutive model development of FRP-to-concrete interface under middle/low loading rates

作　　者：李晓琴[1] 陈前均 陈建飞[3] 陶毅[4] LI Xiaoqin;CHEN Qianjun;CHEN Jianfei;TAO Yi(Faculty of Civil Engineering, Kunming University of Science and Technology, Yunnan 650500, China;School of Planning, Architecture and Civil Engineering, Queen’s Univ. Belfast, Belfast BT9 5AG, UK;School of Civil Engineering, Xi′an Univ. of Arch.& Tech., Xi′an 710055, China;Yunnan Qualcesaye Seismic Isolation Technology Co., Ltd, Kunming 650217, China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南震安减震科技股份有限公司,云南昆明650217 [3]贝尔法斯特女王大学建筑与土木规划学院 [4]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2019年第2期219-222,共4页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金青年科学基金(NSFC51308271 NSFC51408478);昆明理工大学分析测试基金项目(2017M20162110027)

摘　　要：纤维增强复合材料(fiber reinforced polymer,简称FRP)常被用于加固钢筋混凝土结构,FRP与混凝土的粘结性能是确保加固效果的关键,但目前缺乏合适的考虑FRP与混凝土界面行为非线性和滑移速率效应的本构模型.本研究基于LS-DYNA子程序开发平台,进行了本构模型开发,该模型考虑了界面本构非线性关系及滑移速率效应对界面剪切模态断裂能G^(II)_f的影响,完整定义了中低速荷载(滑移速率为10^(-7 )～10^(-3 ) m/s)作用下FRP与混凝土界面的动态粘结-滑移关系.采用该模型对FRP与混凝土界面单元受中低速荷载作用的纯剪切模态进行有限元模拟,有限元计算结果表明,该本构模型可以准确反映中低速荷载作用下FRP与混凝土界面的动态粘结-滑移关系.Fiber reinforced polymer(FRP)can be used to streng then the concrete structure. The bond behaviors between FRP and concrete significantly affect effectiveness of FRP retrofitting. There is a lack of appropriate constitutive model which includes both bond-slip nonlinearity consideration and strain/slip rate effects. In the current study, based on the LS-DYNA subroutine working platform, a material model is developed. The model considered the nonlinearity of the interface constitutive relationships and the effects of strain/slip rate on the shear mode fracture energy G II f . A dynamic bond-slip relation of FRP-to-concrete interface under middle/low loading rates (10 -7 ~10 -3 m/s) can be completely defined with this developed model. The model is further used to simulate FRP-to-concrete interface elements under middle/low speed loading in shear mode tests. Finite element analysis results show that this developed constitutive model can be used for representing the dynamic behavior of FRP-to-concrete interface under middle/low loading rates accurately.

关 键 词：FRP 混凝土 中低速荷载 界面本构 模型开发 

分 类 号：TU375.1[建筑科学—结构工程]