A new calculation method for axial load capacity of separated concrete-filled steel tubes based on limit equilibrium theory  

作　　者：刘夏平 孙卓 唐述 黄海云 刘爱荣 

机构地区：[1]College of Civil Engineering,Guangzhou University

出　　处：《Journal of Central South University》2013年第6期1750-1758,共9页中南大学学报（英文版）

基　　金：Projects(51078093,11272095)supported by the National Natural Science Foundation of China;Projects(2011B010300026,2012B04032005)supported by Guangdong Science and Technology Project,China;Project(2011Y2-00006)supported by Guangzhou City Science and Technology Research Project,China;Project(2012CXZD0028)supported by the Science and Technology Innovation Projects of Department of Education of Guangdong Province,China

摘　　要：A new calculation method for axial load capacity of separated concrete-filled steel tubes based on limit equilibrium theory was proposed,which took into account the decrease of confinement effect by steel tube and the non-uniform distribution of ultimate stress in cored concrete.The accuracy of the analytical result is validated through running the numerical result by finite element method (FEM) and experimental data as well.The influences of the key parameters on the load capacity of the concrete-filled steel tube (CFST) was studied,including the separation ratio,concrete compressive strength,and steel strength.The results indicate that the load capacity of the tube increases with concrete strength and steel strength under the separation ratio less than 4%,while decreases with a higher separation ratio improved.A new calculation method for axial load capacity of separated concrete-filled steel tubes based on limit equilibrium theory was proposed, which took into account the decrease of confinement effect by steel tube and the non-uniform distribution of ultimate stress in cored concrete. The accuracy of the analytical result is validated through running the numerical result by finite element method （FEM） and experimental data as well. The influences of the key parameters on the load capacity of the concrete-filled steel tube （CFST） was studied, including the separation ratio, concrete compressive strength, and steel strength. The results indicate that the load capacity of the tube increases with concrete strength and steel strength under the separation ratio less than 4%, while decreases with a higher separation ratio improved.

关 键 词：concrete-filled steel tube limit equilibrium theory axial load capacity 

分 类 号：TU398.9[建筑科学—结构工程]