An experimental analysis on the axial compression of steel bone T-shaped concrete-filled steel tubular long columns

In order to study the mechanical properties of steel bone T-shaped concrete-filled steel tubular long columns under axial compression,an experimental analysis on 16 specimens with the slenderness ratio of 16λ43 under axial compression was carried out.The failure modes and work mechanism were studied,and curves of load-longitudinal displacement,load-strain and load-deflection of the specimen were obtained.By analyzing the effects of hoop index,bone index,slenderness ratio and other parameters on the mechanical property of the specimens under axial compression and comparing the experimental value of the specimen's ultimate bearing capacity with the theoretical value,the computational method of stability coefficient of the steel bone T-shaped concrete-filled steel tubular long columns under axial compression is proposed.The research results show that T-shaped concrete-filled steel tubular columns embedded with the H shaped steel bones have good ductility;steel tube,concrete and steel bone can work collaboratively,which improves the brittle failure properties of the core concrete and the bearing capacity of the composite column.The formula could be valuable for engineering design.