Energy absorption of foam concrete filled aluminum tube composite cladding
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摘要: 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/m3、700 kg/m3、1100 kg/m3)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/m3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/m3和1100 kg/m3，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/m3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/m3和1100 kg/m3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。Abstract: 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/m3, 700 kg/m3 and 1100 kg/m3, 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/m3 foam concrete is slightly inferior to that of the hollow aluminum tube. With increasing the foam concrete density to 700 kg/m3 and 1100 kg/m3, 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/m3 foam concrete filled composite claddings, which are increased by 28.6% and 68.9%, respectively. Nevertheless, the specific energy absorptions of 700 kg/m3 and 1100 kg/m3 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.
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Keywords:
- foam concrete /
- aluminum tube /
- composite cladding /
- deformation model /
- energy absorption
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图 1 不同密度泡沫混凝土浆体流动度
Figure 1. Slurry fluidity of foam concrete with different densities
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图 2 填充泡沫混凝土铝管试件制作过程
Figure 2. Fabrication process of foam concrete filled aluminum tube
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图 4 700 kg/m3的泡沫混凝土立方体试块准静态压缩变形破坏模式
Figure 4. Deformation process and failure mode of cubic foam concrete specimen with density of 700 kg/m3 under quasi-static compression
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图 5 4种不同密度泡沫混凝土名义应力-应变曲线
Figure 5. Nominal stress-strain curves of foam concrete with four different densities
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图 6 300 kg/m3泡沫混凝土压实应变测定
σ—Stress; ε—Strain
Figure 6. Determination of densification strain of 300 kg/m3 foam concrete
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图 7 不同密度泡沫混凝土的能量吸收总量和比吸能ESA
Figure 7. Total energy absorption and specific energy absorption ESA of foam concrete with different densities
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图 8 填充不同密度泡沫混凝土铝管破坏模式
Figure 8. Failure modes of aluminum tubes filled with different densities of foam concrete
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图 9 空铝管和填充泡沫混凝土铝管的变形模式
Figure 9. Deformation modes of hollow and foam concrete filled aluminum tube
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图 10 填充不同密度泡沫混凝土铝管的载荷-位移曲线
Ef—Energy absorption efficiency
Figure 10. Force-displacement curves of aluminum tubes filled with different densities of foam concrete
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图 11 填充不同密度泡沫混凝土铝管的能量吸收总量和ESA
Figure 11. Total energy absorption and specific energy absorption ESA of aluminum tubes filled with different densities of foam concrete
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图 13 填充不同密度泡沫混凝土组合挂板的破坏模式
CC—Composite hanging plate
Figure 13. Failure mode of composite cladding with hollow and different densities of foam concrete filled aluminium tubes
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图 14 空铝管和填充不同密度泡沫混凝土铝管组合挂板的载荷-位移曲线
Figure 14. Force-displacement curves of composite cladding with hollow and different densities of foam concrete filled aluminium tubes
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图 15 单根填充铝管和组合挂板中填充铝管在准静态压缩下的吸能性能
Figure 15. Energy absorption of single foam concrete filled aluminium tube and filled aluminum tube in composite cladding under quasi-static compression
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图 16 单根填充铝管和组合挂板中填充铝管的压实应变
Figure 16. Densification displacement of single foam concrete filled aluminium tube and filled aluminum tube in composite cladding under quasi-static compression
表 1 水泥基本参数
Table 1 Basic parameters of cement
Cement Specific surface area/(m2·kg−1) Setting time/min Flexural strength/MPa Compressive strength/MPa Initial Final 1 d 3 d 1 d 3 d R.SAC 42.5 40 10 15 6.1 6.5 37.2 45.1 
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表 2 不同密度的泡沫混凝土配合比
Table 2 Mix proportion of foam concrete with different densities
Foam concrete density/(kg·m−3) Mix proportion/(kg·m−3) Water-cement ratio Cement Water Water reducer Foam 300 159.92 79.96 0.48 60.12 0.5 700 438.04 219.02 1.31 42.95 0.5 1100 716.16 358.08 2.15 25.77 0.5 1700 1133.33 566.67 3.40 0 0.5
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表 3 泡沫混凝土和填充泡沫混凝土铝管试件汇总
Table 3 Summary of foam concrete and aluminum tubes filled with foam concrete
Specimen Foam concrete density/(kg·m−3) Specimen Foam concrete density/(kg·m−3) FC-300 345 AT-FC-0 0 FC-700 713 AT-FC-300 313 FC-1100 1126 AT-FC-700 689 FC-1700 1784 AT-FC-1100 1098 Notes: FC—Foam concrete; AT-FC—Aluminum tubes filled with foam concrete.
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表 4 泡沫混凝土填充铝管的吸能性能
Table 4 Energy absorption of the foam concrete filled aluminum tube
Specimen Densification displacement/mm Total energy absorption/J Specific energy
absorption/(J·kg−1)Aluminum tube Foam concrete filler Foam concrete filled
aluminum tubeAT-FC-0 32.3 203.1 − 203.1 1460.9 AT-FC-300 22.6 133.0 13.9 146.9 457.8 AT-FC-700 21.4 124.7 458.0 582.7 1294.8 AT-FC-1100 17.7 68.6 1586.4 1655.0 2713.1
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