木塑-混凝土组合柱轴心受压试验及有限元分析

Axial Compression Test and Finite Element Analysis of Wood Plastic-Concrete Composite Columns

目的为了实现建筑工程领域节能环保及可持续发展,提出木塑-配筋混凝土柱这一新的结构形式,为开展研究这类构件力学性能奠定基础.方法设计制作了5根试验柱:木塑立柱、木塑素混凝土组合柱、钢筋混凝土柱、配箍率不同的两根木塑混凝土组合柱,完成了试验柱轴心加载试验,并与传统钢筋混凝土柱进行对比分析,获得相关试验数据.结果在木塑型材中配置纵向受力钢筋并浇筑混凝土,能够明显提高木塑柱的抗压承载力,改善了木塑型材在压力作用下的破坏形态,与同尺寸钢筋混凝土柱相比,在保证承载力没有降低的情况下节约了混凝土用量.结论柱中箍筋用量的改变对柱承载力及破坏形态没有影响,木塑型材有效约束了混凝土柱轴心受压时的侧向位移,并提高了柱的延性指标.利用有限元软件模拟结果与试验实测结果能够较好吻合,充分验证了试验结果的准确性.

To achieve the purpose of environmental protection and sustainable development in con- struction projects, we create the structural form of wood reinforced concrete column which we compare and analyze with the traditional reinforced concrete columns. To laid the groundwork for developing the analysis on such designs, we have designed five testing columns as follows：the wood column, wood-plastic concrete composite column, reinforced concrete column, wood-plastic concrete composite columns of two different respective hoop reinforcement ratios. And with them, we finished the experiment on the axial loading of the testing columns and acquired relevant testing results. Adding longitudinal tensile bar and pouring concrete into the wood-plastic composite can significantly improve its crushing and bearing capability and failure deformation under pressure. In comparison with reinforced concrete of the same size, the former saves the concrete content but maintains the bearing capability. The amount of hoops has no effect on the bearing capability and failure deformation of the column because the wood-plastic composites effectively restrain lateral deviation and improves the ductility performance when the axis of the reinforced concrete is compressed. The simulation result by virtue of FEA software are in accordance with the experimental one, which best verifies the accuracy of the test.