填充泡沫混凝土铝管组合挂板的吸能性能

Energy absorption of foam concrete filled aluminum tube composite cladding

为提高金属圆管组合挂板的吸能性能,提出一种填充泡沫混凝土铝管组合挂板。在铝管中分别填充不同密度(300 kg/m^(3)、700 kg/m^(3)、1100 kg/m^(3))的泡沫混凝土,并对单根填充泡沫混凝土铝管和填充泡沫混凝土铝管组合挂板在准静态压缩下的变形模式、力学性能和吸能性能进行试验研究。结果表明:与单根空铝管相比,填充300 kg/m^(3)泡沫混凝土会小幅降低填充铝管的吸能性能,随着填充物密度增加至700 kg/m^(3)和1100 kg/m^(3),填充铝管的吸能性能大幅提升,能量吸收总量分别提高286%和815%;与单根铝管压缩相比,组合挂板中填充铝管产生的挤压作用会大幅提升空铝管和填充300 kg/m^(3)泡沫混凝土铝管组合挂板的比吸能,分别提升28.6%和68.9%,而降低填充700 kg/m^(3)和1100 kg/m^(3)泡沫混凝土铝管组合挂板的比吸能,分别降低42.7%和38.1%。因此,考虑组合挂板实际应用,当泡沫混凝土填充物密度较小时,建议选择较小铝管间距;当泡沫混凝土填充物密度较大时,建议选择较大铝管间距防止芯层铝管发生挤压。

To improve the energy absorption performance of metal circular tube composite cladding,foam concrete filled aluminum tube composite cladding was proposed in the present study.With consideration of different foam concrete densities of 300 kg/m^(3),700 kg/m^(3)and 1100 kg/m^(3),the deformation mode,mechanical properties and energy absorption performance of single foam concrete filled aluminum tube,as well as foam concrete filled aluminum tube composite cladding under quasi-static compression,were experimentally investigated.The results show that the energy absorption of the aluminum tube filled with 300 kg/m^(3)foam concrete is slightly inferior to that of the hollow aluminum tube.With increasing the foam concrete density to 700 kg/m^(3)and 1100 kg/m^(3),the energy absorption performance of the filled aluminum tube is significantly improved with the increased total energy absorption by 286%and 815%,respectively.Compared to the single aluminum tube,the mutual extrusion among tubes would greatly improve the specific energy absorption of the hollow aluminum tube and 300 kg/m^(3)foam concrete filled composite claddings,which are increased by 28.6%and 68.9%,respectively.Nevertheless,the specific energy absorptions of 700 kg/m^(3)and 1100 kg/m^(3)foam concrete filled aluminum tube composite cladding decrease by 42.7%and 38.1%due to the mutual extrusion effect of aluminum tubes.Therefore,from the point view of the practical application of the proposed foam concrete filled aluminum tube composite cladding,a small aluminum tube spacing is suggested with the low density of foam concrete filler,meanwhile,a large aluminum tube spacing is recommended to prevent the extrusion of aluminum tube with the high density of foam concrete filler.