ABSTRACT
The research on the flexural behavior of concrete- steel composite girders with tubular flanges was studied in this paper. Bending tests of concrete- steel composite girders with tubular flanges were conducted to obtain the failure mode and flexural capacity. The numerical simulation and parameter analysis of concrete- steel composite girders with tubular flanges were carried out. Based on the elastic-plastic analysis theory, a simplified calculation model of flexural capacity of the steel-concrete composite girder with tubular flanges was established. The design requirements were put forward for the steel-concrete composite girders with tubular flanges. The results show that the strength of the steel has a greater influence on the ultimate flexural capacity of steel-concrete composite girders than the strength of the concrete. With the increase of the thickness and width of the bottom flange, the ultimate flexural capacity of steel-concrete composite girders increases and the corresponding vertical ultimate displacement decreases accordingly. The proposed simplified calculation formula can be used to estimate the flexural bearing capacity of composite girders with tubular flanges.
