填充泡沫混凝土铝管组合挂板的吸能性能

周宏元; 樊家乐; 王小娟; 刘浩

doi:10.13801/j.cnki.fhclxb.20220811.004

填充泡沫混凝土铝管组合挂板的吸能性能

doi: 10.13801/j.cnki.fhclxb.20220811.004

周宏元^{1, 2},
樊家乐¹,
王小娟^1, ,,
刘浩¹

1.
北京工业大学　城市与工程安全减灾教育部重点实验室，北京 100124
2.
北京理工大学　爆炸科学与技术国家重点实验室，北京 100081

基金项目: 国家重点研发计划(2019YFD1101005)；国家自然科学基金(52178096；51808017；51778028)

详细信息

通讯作者:
王小娟，博士，副教授，博士生导师，研究方向为建筑材料力学性能　E-mail: xiaojuanwang@bjut.edu.cn

中图分类号: TB301；TB333
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出版历程
- 收稿日期: 2022-05-27
- 修回日期: 2022-07-16
- 录用日期: 2022-07-28
- 网络出版日期: 2022-08-12
- 刊出日期: 2023-05-15

Energy absorption of foam concrete filled aluminum tube composite cladding

ZHOU Hongyuan^{1, 2},
FAN Jiale¹,
WANG Xiaojuan^{1
, ,},
LIU Hao¹

1.
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Funds: National Key Research and Development Program (2019YFD1101005); National Nature Science Foundation of China (52178096; 51808017; 51778028)

摘要

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。
- 泡沫混凝土 /
- 金属铝管 /
- 组合挂板 /
- 变形模式 /
- 吸能性能
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.
- 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 3 准静态压缩试验装置

Figure 3. Expremental set-up for quasi-static compressive test

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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E_SA

Figure 7. Total energy absorption and specific energy absorption E_SA 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

E_f—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E_SA

Figure 11. Total energy absorption and specific energy absorption E_SA of aluminum tubes filled with different densities of foam concrete

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图 12 组合挂板安装示意图

Figure 12. Installation diagram of composite cladding

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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

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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
Cement	Specific surface area/(m²·kg⁻¹)	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
Foam concrete density/(kg·m⁻³)	Cement	Water	Water reducer	Foam	Water-cement ratio
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)
Specimen	Densification displacement/mm	Aluminum tube	Foam concrete filler	Foam concrete filled aluminum tube	Specific energy absorption/(J·kg⁻¹)
AT-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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