H-shaped steel beam with concrete-filled tubular flange, which has greatly increased lateral buckling strength due to the rectangular upper tube filled with concrete in place of steel plate flange in the conventional H-shaped steel beam, has been proposed. This beam member can be much effectively applied to the long-span roof structures without lateral supports. Experiments on the flexural capacity of H-shaped steel beam with concrete-filled tubular flange were performed, and the results were examined. Test parameters were the shape of tubular flange, the thickness of tubular flange, the existence of filled concrete, and the compressive strength of filled concrete. A total of six specimens were prepared and tested under the concentrated loads of two points. Deformation characteristics, failure mode, load-displacement relationship and sectional strain distribution of each specimen were investigated, and the maximum test load and the nominal strength based on the plastic theory were compared. The effects of each test parameter on the flexural capacity such as maximum strength, deformation capacity, and load-displacement relationship were examined.

H-shaped steel beam with concrete-filled tubular flange, which has greatly increased lateral buckling strength due to the rectangular upper tube filled with concrete in place of steel plate flange in the conventional H-shaped steel beam, has been proposed. This beam member can be connected with concrete slab to develop the composite beam. Experiments on the flexural capacity of the composite beam were performed, and the results were examined. Test parameter was the shape of steel flange. A total of three specimens were prepared and tested under the concentrated loads of two points. Deformation characteristics, failure mode, load-displacement relationship and sectional strain distribution of each specimen were investigated, and the maximum test load and the nominal strength based on the plastic theory were compared. The effects of test parameter on the flexural capacity such as maximum strength, deformation capacity, and load-displacement relationship were examined.

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