考虑尺寸效应的FRP约束混凝土轴压圆柱的本构模型和变参数研究  

Constitutive model for axially-loaded FRP confined concrete columns including size effects and parametric study

作　　者：龙跃凌[1,2] 卜方坛 黄启山 

机构地区：[1]广东工业大学土木与交通工程学院,广东广州510006 [2]华南理工大学建筑学院,广东广州510641

出　　处：《混凝土》2016年第1期88-92,共5页Concrete

基　　金：国家自然科学基金项目资助(51008085);广州市珠江科技新星专项资助(2012J2200100);中国博士后科学基金资助项目(2014T70807;2012M511810);广东工业大学大学生创新项目(xj201411845056)

摘　　要：在现有标准试件的FRP约束混凝土本构模型基础上,提出了考虑尺寸效应的FRP约束混凝土轴压圆柱的本构模型。应用该模型对国内外大量不同尺寸的FRP约束混凝土轴压圆柱试件进行计算,计算曲线与试验曲线比较,结果整体吻合良好。表明所提出的本构模型不仅能考虑尺寸效应的影响,还对不同材质的FRP约束混凝土具有较好适用性。最后应用所提出的本构模型进行变参数研究。研究表明,在约束应力相同时,随试件尺寸增大,FRP约束混凝土轴压圆柱极限应力和极限压应变均下降。其下降幅度,随混凝土强度减少而增加。即FRP约束普通混凝土的尺寸效应较FRP约束高强混凝土明显。另外,混凝土强度相同时,约束应力较大(强约束)的FRP约束混凝土的尺寸效应比约束应力较小(弱约束)的FRP约束混凝土小。Based on the available constitutive model for axially - loaded standard FRP confined concrete columns, a constitutive model for axially - loaded FRP confined concrete columns including size effects was proposed. The proposed model was applied in computations for a large number of axially - loaded FRP confined concrete columns in various sizes.Comparisons between the curves by the proposed model and experimental ones show a good agreement.It shows the size effects can be considered in the proposed model and the model is appropriate for concrete confined by various FRPs. Finally, a parametric study based on the proposed model was carried out.Results show both the ultimate strength and the ultimate strain of axially - loaded FRP confined concrete columns decrease with the size increasing when the confining stresses are the same. Furthermore, the decrease is more obvious for lower strength concrete. Namely, the size effects of FRP confined normal - strength concrete are larger than those of FRP confined high - strength concrete. In addition, the size effects of FRP confined concrete under large confining stresses are smaller than those of FRP confined concrete under small confining stresses when the concrete strength is the same.

关 键 词：FRP 本构模型 尺寸效应 

分 类 号：TU528.01[建筑科学—建筑技术科学]