三种不同截面形状FRP约束混凝土应力-应变关系的试验研究

COMPRESSIVE STRESS-STRAIN BEHAVIOR OF CONCRETE CONFINED BY FIBER REINFORCED POLYMER

通过对 2 1个三种不同截面形状的FRP约束混凝土短柱的全过程试验研究 ,证实了不同截面形状的FRP约束混凝土具有相似的应力 -应变全过程曲线 ,但由于其有效约束的差异 ,即使混凝土短柱强度和FRP含量相同 ,其全过程曲线的一些特征值也各不相同。结合国内外相关试验结果 ,给出了统一的适用于不同截面形状的应力 -应变关系方程 ,并给出了以约束刚度 βj

The results of test made with 21 FRP confined concrete columns in three different sectional shapes show that the strain-stress curves of FRP confined concrete columns are similar to each other.But because of effective confine′s difference,characteristic values of strain-stress curves are different even though strength of concrete and the content of FRP are the same.Referring to a large test database assembled from domestic and foreign existing studies,an uniform formula of stress-strain relationship is proposed.In order to calculate eigenvalues,methods of confine stiffness β-j choosen as a primary parameter are given.