圆钢管混凝土短柱局压力学性能研究

进行了12个圆钢管混凝土短柱局压试验,探讨混凝土强度等级、局压面积比对钢管混凝土短柱局压极限承载力的影响.试验结果表明,混凝土强度等级提高,极限承载力增大而延性降低;局压面积比减小,则承载力越高延性越低.采用合理的材料本构关系,利用ABAQUS有限元软件建立圆钢管混凝土短柱局压的壳-实体三维有限元模型,在试验验证的基础之上,利用ABAQUS软件及相应的有限元模型探讨局压面积比、含钢率、钢材强度和混凝土强度对短柱局压极限承载力的影响.通过拟合分析提出圆钢管混凝土短柱局压极限承载力的实用计算公式,将该计算公式、有限元计算值、其他学者提出的计算公式与笔者试验及其他学者共47组圆钢管混凝土短柱局压试验资料进行对比,分析结果表明,笔者提出的公式计算结果与试验结果相比具有较高的精度.

Mechanical Behavior of Concrete-filled Steel Tubes Stub Columns with Circular Section under Local Compression

This paper studied the mechanical properties of circular concrete-filled steel tubular (CFT) stub columns with local compression, conducted an experimental study of the local compression of 12 circular CFT stub columns and compared the influence of concrete strength grade and local compression area ratio on ultimate bearing capacity. It is found that the ultimate bearing capacity increases with the increase of concrete strength grade and the decrease of area ratio. Then, based on the reasonable material constitutive relation, it established a shell-solid 3D finite element model of circular CFT stub columns with local compression by using ABAQUS. And on the basis of the experiment verification, it explored the influence of local compression area ratio, steel ratio, and strength of steel and concrete on ultimate bearing capacity. Furthermore, this paper presented practical computational methods for the local compression bearing capacity of CFT stub columns with circular section by fitting analysis. It then compared the 47 groups of circular CFT stub columns, which combined the formula results, and calculation formula by other scholars, with the finite calculation results. The results show that the formula results are in good agreement with the experiment results.