基于统一理论的复式钢管混凝土轴压承载力计算

On the axial bearing capacity of composite concrete-filled steel tubes based on the unified theory

依据钢管混凝土统一理论,将其研究成果推广应用于复式钢管混凝土轴压强度计算中,分析了复式钢管混凝土轴压受力机理,考虑不同内外钢管截面形式,提出复式钢管混凝土等效套箍系数,分别计算实复式钢管混凝土和复式空心钢管混凝土短柱的轴压强度.公式计算结果分别与文献试验数据进行了对比,结果表明:在满足一定的含钢率和空心率范围内,可以用统一理论计算复式钢管混凝土的轴压承载力,为复式钢管混凝土承载力设计计算提供了新的理论方法.

According to the Unified Theory with concrete-filled steel tube, the paper introduces the method for counting the strength of the composite concrete-filled steel tubes under axial compression. Performance and mechanism of composite concrete-filled steel tubular column under axial compression are analyzed. On account of different sections of inner and outer tubes, the equivalent hooping coefficient is calculated. Then the strength is analyzed for both solid and hollow columns. Formula solutions are testified by test results of references. The result shows that the formulas of the Unified Theory can be applied to the composite concrete-filled steel tubes under proper effect of steel ratio, equivalent hooping coefficient and hollow ratio. It is a new approach to calculate the axial bearing capacity of composite concrete-filled steel tubes.