This paper presents a three-dimensional structural model of an exposed column-base,which takes
account of bi-axial bending. The applicability of this model is confirmed by finite element analysis on
a canti-lever with exposed column-base subjected to bi-directional horizontal forces. The following
observations were made:
1) The model takes account of variation of rotational rigidity due to initial anchor bolt tensioning
and axial force of column-base.
2) The model adjusts the maximum bending moment capacity and rotational rigidity by changing the
line of action of the compressive force line and rigidity modification coefficient.
3) The result of the present model agrees closely with finite-element-analysis results.