THREE DIMENSIONAL ANALYSIS MODEL FOR EXPOSED COLUMN-BASE CONSIDERING BI-AXIAL BENDING EFFECT

This paper presents a three-dimensional structural model of an exposed column-base, that take into account bi-axial bending effect. The applicability of this model is confirmed through loading tests and 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 take into account of variation of rotational rigidity due to initial anchor bolt tensioning and axial force of column-base. 2) The model adjust 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 from the present model agree closely with loading-test and finite-element-analysis results.