Flexural members of steel tube filled with steel-reinforced high-strength concrete

Abstract:

In order to study the flexural performance of members of steel tube filled with steel-reinforced highstrength concrete (STFSC),experimental and theoretical researches on the flexural behavior of 5 I shape of STFSC were carried out.The parameters in the study include the steel-reinforced index ρ=0.3-0.6 and different loading directions of steel-reinforce.The results indicate that bearing capacity of composite member nonlinearly increases with the increase of steel-reinforced index,but it linearly increases with the moment of inertia and the deformation of minor axis is bigger than that of major axis when the steel-reinforced index is determined.Composite member accords with plane section assumption,and the deflection of member fits for sine curve.The major axis of confining force of steel tube and steel-reinforce to concrete is more obvious than its minor axis,and the confining force is increased with the decrease of steel-reinforced index.Based on the experimental analysis,formula of bearing capacity of flexure is built,and a good agreement is obtained between calculating results and experimental results.