| Title |
A Study on the Structural Characteristics of Concrete Filled Steel Tube Columns |
| Abstract |
When a tube is acting as a compression member, filling the tube with concrete is advantageous because it increases the load-carrying capacity without increasing the size of the column. Steel at the perimeter of the cross section provides stiffness and triaxial confinement. In addition, the concrete cone resists compression and prohibits local buckling of the steel encasement. The thoughness and ductility of concrete filled steel tube composite columns are preferred column behavior for earthquake resistence.This paper deals with elastic stiffness and ultimate bearing capacity of concrete filled steel bube columns. The purposes of this paper are as follows.1)To suggest the axial force-moment(N-M) interaction curves for the allowable and plastic capacity of the composite section by a numerical method, where the allowable capacities are summarized in accordance with the plane maintenance method and the simple summation method. 2)To evaluate the efficiency of filled concrete in the composite section according to a change of the width-thickness ratio of the steel tube using a non-dimensional method.3)To confirm the superiority of the composite section in the bending and axial stiffness by comparison of story drift values. |