泡沫混凝土填充双箭头结构的准静态压缩性能
Quasi-static compression performance of double arrowhead honeycomb filled with foam concrete
周宏元 1郭春燕 2王小娟 2张宏3
作者信息
- 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;北京理工大学 爆炸科学与安全防护全国重点实验室,北京 100081
- 2. 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
- 3. 北京理工大学 爆炸科学与安全防护全国重点实验室,北京 100081
- 折叠
摘要
为提高三明治结构的力学和能量吸收性能,提出一种泡沫混凝土填充双箭头结构.制作双箭头结构并填充不同强度的低密度泡沫混凝土,通过试验得到准静态压缩下填充泡沫混凝土双箭头结构的变形模式、力学性能和能量吸收性能,并使用经试验验证的数值模型进一步分析了胞壁厚度与泡沫混凝土强度、胞元角度等重要因素对此填充结构压缩性能的影响.结果表明:双箭头结构可约束泡沫混凝土,双箭头结构和泡沫混凝土的合理匹配可有效利用两者间的相互作用,优化能量吸收性能.泡沫混凝土填充双箭头结构平均压缩强度的增量随填充泡沫混凝土强度的升高而升高,胞壁厚度为0.2 mm时,填充强度为0.46 MPa泡沫混凝土的结构比吸能最大;胞壁厚度为0.4 mm时,填充强度为1.02 MPa泡沫混凝土的结构比吸能最大.增加胞壁厚度可提高平均压缩强度的增量,提高比吸能.调整胞元角度,可实现对平均压缩强度增量和比吸能的调控.
Abstract
To improve the mechanical and energy absorption performance of sandwich structures,a double arrow-head structure filled with foam concrete was proposed.The double arrowhead structure was prepared and filled with low density foam concrete of various strength.The deformation mode,mechanical properties,and energy absorption performance of the foam concrete-filled double arrowhead structure under quasi-static compression were experimentally obtained.Furthermore,a numerical model validated by test results was employed to investi-gate the influence of important factors such as cell wall thickness,strength of foam concrete and cell angle on the compression performance of the filled structure.The results suggest that if properly designed,the double arrow-head structure is able to effectively confine the foam concrete.The reasonable matching between the double arrow-head structure and foam concrete can benefit the interaction between the two to improve the energy absorption performance.The increment in mean crushing strength of double arrowhead structure filled with foam concrete increases with the strength of the foam concrete.The structure filled with foam concrete of strength 0.46 MPa exhibits the maximum specific energy absorption for cell wall thickness 0.2 mm,and the structure filled with foam concrete of strength 1.02 MPa exhibits the maximum specific energy absorption for cell wall thickness 0.4 mm.Increasing the cell wall thickness promotes the increment in mean crushing strength and specific energy absorp-tion.Adjusting the cell angle enables the tuning of the increment in average crushing strength and specific energy absorption.
关键词
泡沫混凝土/双箭头结构/负泊松比/准静态压缩/变形模式/能量吸收Key words
foam concrete/double arrowhead honeycomb/negative Poisson's ratio/quasi-static compression/deformation mode/energy absorption引用本文复制引用
出版年
2025
NETL
NSTL
万方数据