Special-section steel tube column filled with steel-reinforced is a new type heavy-load composite columns.To investigate the axial compression stability mechanical property of this component,seventeen slender L-section steel tube columns filled with steel-reinforced were tested.The primary test parameters were the slenderness ratios,section steel index and confinement index.The loading process was analyzed，the load-average longitudinal strain curves，load-deflection curves，ultimate bearing capacity of the specimens were tested，and the influences of parameters on the axial load behavior were studied.The experimental results showed that the main failure modes of specimens are steel tube buckling on the end of specimens.With the increase of slenderness ratios, the ultimate bearing capacity of the columns decreases.The section steel index and the confinement index are the key factors effecting the ultimate bearing capacity. Based on the conclusions of domestic and abroad codes,the formula about stability bearing capacity under axial compression of L-section steel tube columns filled with steel-reinforced concrete was deduced.The calculated values agreed well with the experimental results.
