聚氯乙烯-纤维增强材料管混凝土短柱的轴压非线性有限元分析

NONLINEAR FINITE ELEMENT ANALYSIS OF PVC-FRP CONFINED CONCRETE SHORT COLUMN UNDER AXIAL COMPRESSION

借助有限元分析软件,考虑核心混凝土在三轴状态下的非线性行为以及聚氯乙烯(PVC)管与核心混凝土的相互作用,建立聚氯乙烯(PVC)-纤维增强材料(FRP)管混凝土短柱轴压有限元模型。结果表明,PVC-FRP管明显提高了核心混凝土的延性,非线性有限元分析结果与试验结果吻合较好。在此基础上,利用建立的有限元模型,分析在加载过程中核心混凝土、PVC管和FRP条带内力变化规律,探讨混凝土强度等级、FRP条带层数、PVC管厚度、FRP条带宽度等因素对PVC-FRP管混凝土短柱应力-应变关系的影响规律。

Using finite element analysis software, considering the non-linear behavior of core concrete under tri-axial state and interaction between the PVC tube and the core concrete, a finite element analysis model of PVC-FRP confined concrete short column was established.The results showed that the brittleness of plain concrete was greatly improved by PVC-FRP tube, and the non-linear finite element analysis results agreed well with test results.On this basis, the variation rules of the internal forces of core concrete, PVC tube and FRP strips during loading were analyzed by using the established finite element analysis model.The influence law of concrete strength, the layers of FRP strips, the thickness of PVC tube and the width of FRP strips on the stress-strain curve of PVC-FRP confined concrete short column was also discussed.