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采用真空导入工艺,制备了格构腹板增强泡桐木夹芯复材板。对不同格构腹板厚度和不同腹板间距的试件进行四点弯曲试验,研究其破坏模式、跨中应变和跨中挠度情况。试验结果表明:增加腹板厚度能有效提高夹芯板的极限承载力,提高幅度随腹板厚度的增加而减小;减小格构腹板间距也能提高夹芯板的极限承载力,提高幅度随格构腹板间距的减小而减小。采用铁木辛柯梁理论,考虑弯曲和剪切变形的共同影响,推导出板材跨中挠度计算式;采用经典夹芯梁理论预估了试件的受弯极限承载力,挠度和承载力的理论值与实测值均吻合较好。
Using vacuum import process, prepared grid reinforced web Paulownia sandwich board. Four-point bending tests were conducted on specimens with different lattice web thicknesses and different web spacings to investigate the failure modes, mid-span strain and mid-span deflection. The experimental results show that increasing the web thickness can effectively increase the ultimate bearing capacity of the sandwich panel, and the increase rate decreases with the increase of the web thickness. Reducing the grid spacing can also increase the ultimate bearing capacity of the sandwich panel, The amplitude decreases as the lattice spacing decreases. The calculation formula of the mid-span deflection of the slab is deduced by considering the combined effect of bending and shear deformation by using the Tiemu Xinke beam theory. The classical sandwich beam theory is used to predict the ultimate bearing capacity, deflection and bearing capacity of the specimen Theoretical and measured values are in good agreement.