圆钢管高强混凝土轴压短柱受剪承载力分析

Shear resistant behavior of axially loaded high-strength concrete-filled steel tubular stub columns

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。

This paper investigates the failure modes and mechanisms of shear failure, and propose axial strength of high-strength concrete-filled steel tubular （HSCFT） stub columns. With regard to the shear failure of HSCFT stub columns, the reason and mechanism of shear failure are analyzed using Mohr-Coulomb law. The shear bearing capacity of high-strength concrete-filled steel tubes is proposed using shear failure theory. Shear failure envelop curves for the axially loaded HSCFT stub columns are propose based on the related tests and numerical regressions of the vertical stress vs. vertical strain and horizontal stress vs. vertical strain relationships of steel tubes. And the predicted envelop curves agree with the tests results and may be used to predict the shear strength of HSCFT stub columns.