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.
出处
《应用基础与工程科学学报》
EI
CSCD
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)
