| Title |
Design Equations for Square Concrete Filled Tube Beam-Columns based on the modified AISC/LRFD Method |
| Authors |
Choi Young-Hwan ; Lee Moon-Sung |
| Keywords |
Fiber Analysis ; Concrete Filled Tube ; Beam-Columns ; Design Equations. Parametric Study ; Fiber Analysis |
| Abstract |
This paper presents a formulation of new design equations for square concrete filled tube (CFT) beam- columns subjected to single axis bending plus axial force based on the method presented in a companion paper. In order to evaluate the contribution of the concrete in flexure in CFTs, complete parametric study is performed using fiber analysis considering the limitations specified in the current AISC/LRFD. First, nominal moment strength is redefined assuming full composite action. Then, the normalized maximum moment by the nominal moment strength and the axial load ratio at the maximum moment are formulated with respect to width-to-thickness ratio(b/t) and relative concrete strength to the yield strength of the steel tube(fck/Fy). The moment strengths from the new equations are compared to wide range of experimental data, which shows greatly improved results. |