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 capacity,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 ultimate bearing capacity of the composite sandwich column under axial pressure is related to section size of the column,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 sandwich column was deduced and the predictions of the formula agree well with the test data when the value is 0.3.
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