本文以研究Q460高强钢管自密实混凝土短柱轴压力学性能为目的，通过开展6组短柱轴压试验并结合有限元软件ANSYS进行数值模拟分析，探讨核心混凝土强度对钢管自密实混凝土短柱轴压承载力、破坏模式、套箍效应等力学性能的影响规律。研究表明由于采用高强钢管，试件均呈现明显的腰鼓型失效模式；相比普通钢管混凝土柱，钢管自密实混凝土柱具有更好的承载能力，且其承载力与自密实混凝土强度成正比。基于现有规程并结合试验及有限元分析结果，修正了钢管混凝土组合强度公式，为钢管自密实混凝土构件设计提供参考。%In order to investigate the mechanical properties of the Q460 steel stub columns filled with self-compacting concrete under the axial compression, six stub columns were tested combining with the analysis of numerical simulations using ANSYS. The influence of the strength of core concrete on the mechanical behavior such as bearing capacity, failure modes and confining effect of the stub columns were studied. The results show that all the members have failed significantly in drum-type failure mode due to the high-strength steel. Bearing capacity of steel stub columns filled with self-compacting concrete is greater than the ordinary concrete filled steel tube structure, and the higher strength of the self-compacting concrete is, the greater the bearing capacity will be. Based on existing regulations and results of the tests and finite element analysis, the formula of combination strength of concrete filled steel tubular is modified, giving reference to design members of self-compacting concrete-filled tubes.
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