泡沫混凝土填充圆钢管的轴压力学性能

The mechanical property of circular steel tube filled with foam concrete under axially compressive loads was analyzed with both experimental and numerical methods. The energy dissipation capacity of short column members and the axial load bearing capacity of long column members were analyzed by axial compressive experiments. Results showed that short column members failed with progressive folding and energy dissipation increased with the increase of foam concrete density. In the case of long column members, the overall instability failure occured, and the stable bearing capacity increased with the increase of foam concrete density. A numerical model based on ABAQUS Explicit solver was proposed, and the simulation results agreed well with the experimental results. The effects of foam concrete density, diameter-to-thickness ratio and slenderness ratio to specimen's bearing capacity were analyzed. Results showed that the bearing capacity of long column members decreased with the increase of the diameter-to-thickness ratio and slenderness ratio, while increased with the increase of density of the filled foam concrete. A formula of stability capacity of long column members was derived based on the Perry-Robertson formula. The calculation results of the formula show that this formula can predict the axial load bearing capacity of long column members well.