Column Base Fitting Corner Built-Up Portions

The invention applies local quality by forming built-up portions at specific corner regions of the bottom plate where bending moments are highest. These built-up portions locally increase thickness and strength only where needed to resist bending forces, rather than uniformly increasing the entire plate thickness. This resolves the contradiction by providing enhanced flexural capacity at critical locations while maintaining reduced overall weight and size.

The invention transitions from a two-dimensional uniform plate to a three-dimensional structure with varying thickness. By creating built-up portions that protrude upward from the bottom plate surface, the design adds vertical dimensionality to address bending moment requirements. This allows the structure to achieve necessary flexural capacity through localized vertical expansion rather than uniform horizontal expansion, reducing overall weight while maintaining strength.

The built-up portions are strategically positioned at corner regions where bending moments are maximum, providing localized rigidity enhancement. This approach maintains overall compact size while achieving necessary rigidity at critical stress points, avoiding the need to increase the entire plate dimensions.

The bottom plate is segmented into regions of different thicknesses - the built-up portions at corners have greater thickness for rigidity, while the central and edge regions maintain thinner profiles. This segmentation allows the structure to achieve overall rigidity through strategic reinforcement rather than uniform thickening, controlling total size.