钢管混凝土哑铃型短柱极限承载力的等效单圆管算法

哑铃型截面是钢管混凝土拱肋常用的截面形式。本文根据钢管混凝土哑铃型柱轴压与偏压试验,提出了将哑铃型截面等效成单圆管钢管混凝土截面,然后应用钢管混凝土结构设计规程进行极限承载力计算的等效单圆管法。对试件的计算表明,计算值与实验值吻合良好。这个方法概念清晰、计算简单,可供工程应用参考。

Equivalent Single Circular Tube Method for Ultimate Load-carrying Capacity of Concrete Filled Steel Tubular Dumbbell Shaped Short Columns

Dumbbell-shaped section is often used in concrete filled steel tubular (CFST) arch rib. Based on the experiment of dumbbell-shaped CFST concentrically-loaded columns and eccentrically-loaded columns, an equivalent single circular tube method is proposed. In this method, the dumbbell section is transformed into an equivalent single CFST circle tube and the design specification of CFST structure is used to estimate the ultimate load. It can be seen from the calculation for the specimens that the predicting results by the equivalent single circular tube method are close to the testing results. The method is simple to calculate and clear to understand,which can be reference to engineering application.