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对八边形中空夹层钢管混凝土轴压短柱力学性能进行了研究,通过对试验现象和试验结果的详细分析,发现在极限承载力的0.75倍之前,核心混凝土与内外钢管的应变符合平截面假定;在核心混凝土没有破坏之前,内外钢管不会提早发生屈曲。经过与类似的中空夹层钢管混凝土进行承载力比较,得出了影响此类构件的承载力影响因素:名义含钢率、空心率、外钢管斜边段面积与直边段面积之比。
The mechanical properties of the octagonal hollow steel tubular short columns are studied. Through the detailed analysis of the test phenomena and the test results, it is found that the strain of the core concrete and the inner and outer steel pipes meet the plane-section assumption until 0.75 times the ultimate bearing capacity ; Before the core concrete is not damaged, the internal and external pipe will not premature buckling. After comparing with similar hollow concrete-filled CFST, the influencing factors on the bearing capacity of such members are obtained: the nominal steel ratio, the hollow ratio, the ratio of the area of bevel edge and the area of straight edge.