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对设肋方矩形不锈钢管混凝土轴压短柱的力学性能进行了有限元模拟,计算结果得到试验结果的验证。在此基础上,进行了设肋不锈钢管混凝土轴压受力特性分析和影响因素分析,最后提出轴压短柱承载力的实用设计公式。研究结果表明,在相同轴向应变下,设肋不锈钢管混凝土横向变形比不设肋不锈钢管混凝土小,对核心混凝土的约束效果更好,在整个过程中,不锈钢管角部的约束力最大且持续增加,构件的承载力和后期延性比不设肋构件大;和设肋普通钢管混凝土相比,设肋不锈钢管混凝土轴压极限承载力稍小,而后期承载力提高。随着加劲肋宽厚比、混凝土强度、不锈钢强度的增加或不锈钢管宽厚比的减少,设肋不锈钢管混凝土的轴压极限承载力增大。
The finite element simulation of the mechanical properties of ribbed rectangular stainless steel tube short columns with axial compression was carried out. The calculated results were verified by the test results. On this basis, the analysis of the bearing capacity of the ribbed stainless steel tube under axial compression and the analysis of its influencing factors were carried out. Finally, the practical design formula of the bearing capacity of the short stubby bearing was proposed. The results show that under the same axial strain, the lateral deformation of the ribbed stainless steel tube is smaller than that of the non-ribbed stainless steel tube concrete, and the restraint effect on the core concrete is better. During the whole process, the corner of the stainless steel tube has the maximum binding force Compared with the conventional CFST, the axial compressive ultimate strength of the CFST concrete is slightly smaller and the ultimate bearing capacity increases later. With the stiffener aspect ratio, the strength of concrete, the increase of the strength of stainless steel or the decrease of the aspect ratio of the stainless steel tube, the ultimate bearing capacity of the ribbed stainless steel tube concrete increases.