Flexural Behavior of Hollow Section Steel Beams with Partially Infilled Concrete

Abstract

Generally, infilling concrete in hollow section steel beams can enhance their flexural capacity significantly. The infilled concrete plays an important role to resist compressive component of bending moment. In hollow section steel beams without infilled concrete, the compressive component of bending moment is resisted only by the steel flange. Under the compressive component, the beam’s flange reaches their limit when it is buckled. In other words, local buckling of beam flange under compressive component is the component that control the flexural behavior of the hollow section steel beams. In hollow section steel beams with infilled concrete, the concrete resists the compressive component of bending moment together with the beam’s flange. However, even the flexural capacity of the beams with infilled concrete are greater than those one of the beam without infilled concrete, the local buckling of the beam’s flange still be the capacity control component and occurred at the maximum moment position. Therefore, this study aims to reduce unnecessary weight of concrete that may not contribute to the capacity enhancement of the beams with infilled concrete. The flexural testing of hollow section steel beams with infilled concrete about 50 percent of beam length are performed together with the beams with full infilled concrete and without infilled concrete. The results of the study show that of Hollow Section Steel Beams with Partially Infilled Concrete can increase the maximum bending force 1.379-1.615 tons-meters and Results of the study will be discussed.