高延性混凝土加固薄壁方钢管短柱抗压承载力研究
Research on the compressive bearing capacity of thin-walled square steel tube short columns reinforced with high ductility concrete
王融冰 1陈瑞生 2施韬1
作者信息
- 1. 浙江工业大学土木工程学院,浙江 杭州 310014
- 2. 浙江工业大学工程设计集团有限公司,浙江 杭州 310014
- 折叠
摘要
针对薄壁方钢管短柱承载力较低的问题,提出了通过外包高延性混凝土的加固方式来提高构件的极限抗压承载力和延性.利用有限元分析软件ABAQUS建立了高延性混凝土加固薄壁方钢管短柱有限元模型,对现有材料进行了材性试验,将结果用于有限元建立本构关系中;采用环氧树脂作为黏结剂,分别考虑了在静力加载作用下不同宽厚比(40、48、67)、不同加固厚度(4、8、12 mm)对高延性混凝土加固薄壁方钢管短桩的极限抗压承载力和破坏模态的影响.有限元结果表明:采用高延性混凝土加固后,构件的极限抗压承载力提升效果可达到 30%～50%左右,且加固效果随着宽厚比或加固厚度的增大而愈发明显.理论推导出了高延性混凝土加固薄壁方钢管短柱的承载力理论公式,理论公式与有限元误差可控制在 10%以内.
Abstract
In response to the problem of low bearing capacity of thin-walled square steel tube short columns,a reinforcement method of wrapping high ductility concrete was proposed to improve the ultimate compressive bearing capacity and ductility of the components.A finite element model of thin-walled square steel tube short columns reinforced with high ductility concrete was established by using ABAQUS finite element software,material properties tests were conducted on existing materials,and the results were used to establish constitutive relationships in finite element analysis.Using epoxy resin as the binder,the effects of different width to thickness ratios(40,48,67)and different reinforcement thicknesses(4,8,12 mm)on the ultimate compressive bearing capacity and failure mode of thin-walled square steel tube short columns reinforced with high ductility concrete under static loading were considered.The finite element results indicate that the ultimate compressive bearing capacity of the components strengthened with high ductility concrete can be improved by about 30%-50%,and the reinforcement effect becomes more obvious with the increase of width to thickness ratio or reinforcement thickness.The theoretical formula for the bearing capacity of thin-walled square steel tube short columns reinforced with high ductility concrete has been derived,and the error between the theoretical formula and the finite element method can be controlled within 10%.
关键词
冷弯薄壁型钢/高延性混凝土/黏结/极限抗压承载力/理论公式Key words
cold formed thin-walled steel/high ductility concrete/bonding/ultimate compressive bearing capacity/theoretical formula引用本文复制引用
出版年
2024
NETL
NSTL
万方数据