FRP布约束混凝土圆柱轴心受压性能非线性有限元分析

采用非线性分析程序ABAQUS，考虑混凝土在三轴状态下的非线性行为及纤维增强材料（FRP）布对混凝土的被动式约束，对轴压下FRP布约束混凝土圆柱试件的受力行为进行分析，研究FRP布与混凝土的相互作用以及纤维含量对约束混凝土极限强度和极限应变的影响。结果表明：非线性有限元分析结果与实验结果吻合良好，非线性有限元分析可较好预测FRP布约束混凝土柱的轴心受压性能；随着FRP布层数的增加，FRP布约束混凝土的极限强度和极限应变提高，FRP布对混凝土的约束作用明显增强；FRP布对混凝土约束力主要在混凝土屈服后发挥。根据实验和有限元分析结果，得到约束混凝土极限强度和极限应变与纤维约束特征值的关系。

Nonlinear FEM Analysis of Circular Concrete Column Confined with FRP under Axial Compression

By using nonlinear FEM program ABAQUS, the mechanical behaviors of circular concrete column specimens confined with FRP under axial compression were analyzed, considering the nonlinear behavior of concrete under triaxial state and the passive confinement of FRP for concrete. The interaction between concrete and FRP was studied, and the influence of FRP layers on the ultimate strength and strain of concrete was studied. The results indicate that the numerical results agree well with the test results. Nonlinear FEM analysis can better predict the axes compressive properties of FRP confined concrete column. The ultimate strength and strain of FRP confined concrete increase with the increase of FRP layers. The confinement effect of FRP on concrete has obviously improved. The confinement force of FRP on concrete will exert mainly after concrete yield. Based on the experimental results and FEM analysis, the relationship between the ultimate strength and strain of FRP confined concrete and FRP confinement eigenvalue is derived.