复合材料-木塑组合柱轴心受压性能试验研究

EXPERIMENTAL STUDY ON INTERFACE PERFORMANCE OF GFRP COMPOSITE SANDWICH COLUMN WITH WOOD-PLASTIC COMPOSITE CORE

以木塑复合材料、无碱玻璃纤维织物以及不饱和聚酯树脂为原料,采用真空导入工艺制造复合材料-木塑组合柱。对该组合柱进行轴心受压试验,得到其失效模式、承载力以及纵向变形等力学行为。试验结果表明:复合材料-木塑组合柱在轴压荷载作用下,主要破坏模式为轴向受压破坏,且在复合材料面层出现横向裂纹;组合柱极限承载力随着截面尺寸的增加而显著提高,而且组合柱具有良好的延性。采用考虑组合效应的分析方法对该组合柱的轴压承载力进行预测,结果表明当组合系数取0.3时,理论计算结果与试验结果吻合较好。

Fibre reinforced polymer （FRP） composite sandwich column which composed of FRP sheets and wood-plastic composite （WPC） core were manufactured using vacuum infusion molding process with wood-plastic composite, alkali-free glass fiber bundle and unsaturated resin. The effects of the WPC core on load-bearing capaci-ty, the failure mode and load-strain curve were investigated using axial compressive tests. The results showed that a failure of axial strength and transverse cracks occurs in the composite sandwich column under axial pressure. The ul- timate bearing capacity of the composite sandwich column under axial pressure is related to section size of the col- umn, which is raised with the size. In addition, the lateral deformations of the composite sandwich column is greatly constrained by FRP, so the ductility can be improved. A formula of ultimate bearing capacity of the composite sand- wich column was deduced and the predictions of the formula agree well with the test data when the value is 0. 3.