浙江大学学报(工学版)  2019, Vol. 53 Issue (10): 1927-1935    DOI: 10.3785/j.issn.1008-973X.2019.10.010
 土木工程

1. 哈尔滨工业大学 结构工程灾变与控制教育部重点实验室，黑龙江 哈尔滨 150090
2. 哈尔滨工业大学 土木工程智能防灾减灾工信部重点实验室，黑龙江 哈尔滨 150090
Mechanical properties of circular steel tube filled withfoam concrete under axial loads
Xu-dong ZHI1,2(),Meng-hui GUO1,2(),Chen WANG1,2,Qi-jian WU1,2
1. Key Laboratory of Structural Engineering Disaster Control of Education Ministry, Harbin Institute of Technology, Harbin 150090, China
2. Key Laboratory of Civil Engineering Intelligent Disaster Prevention and Mitigation Control of Ministry of Industry and Information, Harbin Institute of Technology, Harbin 150090, China
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Abstract:

The mechanical property of circular steel tube filled with foam concrete under axially compressive loads was analyzed with both experimental and numerical methods. The energy dissipation capacity of short column members and the axial load bearing capacity of long column members were analyzed by axial compressive experiments. Results showed that short column members failed with progressive folding and energy dissipation increased with the increase of foam concrete density. In the case of long column members, the overall instability failure occured, and the stable bearing capacity increased with the increase of foam concrete density. A numerical model based on ABAQUS Explicit solver was proposed, and the simulation results agreed well with the experimental results. The effects of foam concrete density, diameter-to-thickness ratio and slenderness ratio to specimen’s bearing capacity were analyzed. Results showed that the bearing capacity of long column members decreased with the increase of the diameter-to-thickness ratio and slenderness ratio, while increased with the increase of density of the filled foam concrete. A formula of stability capacity of long column members was derived based on the Perry-Robertson formula. The calculation results of the formula show that this formula can predict the axial load bearing capacity of long column members well.

Key words: foam concrete    circular steel tube    axial loaded    stability    Perry-Robertson

 CLC: TU 323

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Xu-dong ZHI,Meng-hui GUO,Chen WANG,Qi-jian WU. Mechanical properties of circular steel tube filled withfoam concrete under axial loads. Journal of ZheJiang University (Engineering Science), 2019, 53(10): 1927-1935.

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 表 1  泡沫混凝土配合比 图 1  泡沫混凝土填充圆钢管截面 表 2  泡沫混凝土填充圆钢管试件的几何参数 表 3  钢管的材料性能 表 4  泡沫混凝土的材料性能 图 2  短柱试件加载装置 图 3  长柱试件加载 图 4  短柱试件的破坏形态 图 5  短柱试件轴向荷载-位移曲线 图 6  长柱试件的破坏形态 图 7  长柱试件轴向荷载-位移曲线 图 8  泡沫混凝土填充薄壁圆钢管有限元模型 图 9  数值模拟与试验变形对比 图 10  数值模拟与试验荷载-位移曲线对比 表 5  极限荷载的模拟值与试验值对比 表 6  各部分材料的承载力 表 7  短柱试件各部分材料对极限承载力的贡献 图 11  稳定承载力与长细比关系曲线 图 12  稳定承载力与径厚比的关系曲线 图 13  泡沫混凝土的材料性能 图 14  稳定承载力与泡沫混凝土填充密度的关系曲线 表 8  长柱构件稳定荷载预测值与试验值对比