FRP约束混凝土应力-应变曲线模型研究  

Research on Confinement Model for FRP-confined Concrete

作　　者：邓宗才[1] 李建辉[1,2] 

机构地区：[1]北京工业大学城市与工程防灾减灾省部共建教育部重点实验室,北京100022 [2]中国建筑科学研究院,北京100013

出　　处：《应用基础与工程科学学报》2010年第3期461-471,共11页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(50978006);北京市自然科学基金项目(8082002)

摘　　要：总结了国内外关于FRP(Fiber Reinforced Polymer)约束混凝土应力-应变关系的最新研究成果,探讨了各应力-应变曲线模型的优缺点,并进行了模型验证.在试验研究和对已有研究成果对比分析的基础上,建立了新的FRP约束混凝土圆柱体的应力-应变曲线模型,该模型使用轴向、横向和体积应变来衡量约束混凝土的内部损伤,以体现FRP变约束力对被约束混凝土内部损伤的影响,从而使模型简化且具有明确的物理含义.通过与试验曲线比较表明,本文建立的理论模型与试验曲线吻合良好.The newest results about stress-strain relationship of FRP-confined concrete at home and abroad were presented,the merits and drawbacks for these confinement models were analyzed,and these confinement models were verified.Based on the experimental data and the analysis on the research production,a constitutive confinement model was developed for concrete circular columns confined with FRP.The feature of the model was that it included the effects of FRP confinement on the concrete microstructure by evaluating the internal concrete damage using the axial,lateral and volumetric strains,which introduced that the confinement model was simple and had a physical and fundamental interpretation with the mechanical behavior of concrete.The FRP-confined concrete model predicts accurately the stress-strain relationship of concrete circular columns confined with FRP as verified in comparison with experiments.

关 键 词：FRP 混凝土 约束 应力-应变关系 

分 类 号：TU375[建筑科学—结构工程]