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为了深入研究钢管高强混凝土轴压短柱破坏模式与破坏机理,提出适合钢管高强混凝土轴压短柱极限承载力计算方法,针对圆钢管高强混凝土轴压短柱大都发生剪切破坏这一典型现象,引入莫尔-库仑强度理论,从理论上分析其发生剪切破坏的原因和受力机理,并从剪切破坏的角度提出了钢管高强混凝土轴压短柱承载力计算方法。利用基于圆钢管高强混凝土轴压短柱试验研究和有限元分析回归得到的处于复杂应力场中的钢管纵向应力σv-纵向应变ε关系曲线和钢管横向应力σh-纵向应变ε关系曲线的数学表达式,得到了钢管高强混凝土轴压短柱承载力包络线的简化计算方法,简化计算曲线与试验曲线吻合良好,可用于分析钢管高强混凝土轴压短柱的受剪承载力。
In order to deeply study the failure mode and failure mechanism of axially compressed short columns of high strength concrete filled steel tube, a calculation method suitable for the ultimate bearing capacity of high strength concrete filled steel tubular columns under axial compression is put forward. In view of the typical phenomenon of shear failure of high- The theory of Mohr Coulomb strength is introduced to analyze the cause of shear failure and the mechanism of shear stress in theory. The calculation method of bearing capacity of axially loaded short columns of high strength concrete filled steel tube is proposed from the perspective of shear failure. The mathematical expression of the relationship between the longitudinal stress εv-longitudinal strain ε and the transverse stress σh-longitudinal strain ε of the steel pipe under complex stress field, which is obtained by the experimental research and finite element analysis based on the axial compression short column test of the high-strength concrete-filled circular steel tubular , A simplified calculation method for the envelope of bearing capacity of high-strength concrete-filled steel tubular short columns is obtained. The simplified calculation curve is in good agreement with the experimental curve and can be used to analyze the shear capacity of high-strength concrete-filled steel tubular short columns under axial compression.