Steel Column Base Plate Design Moment

The example shows a column base with an unstiffened base plate.

Steel column base plate design moment.

Engineers must refer to textbooks for design information though not all texts cover this case. It is designed to support gravity loads bending moments and shear forces. This results in base plate details that are expensive difficult to. Whether each t stub is in tension or compression depends on the magnitudes of the axial force and bending moment.

The column base connection is one of the critical connections in a steel structure. Steel column base plates are one of the most ndamental parts of a steel structure yet the design of base plates is commonly not given the attention that it should by engineers. The couple of forces of bearing on the concrete and tension in anchor bolts resists to the external bending moment resulted by fixing the column base in foundation. Column bases for instance moment frames which resist wind or earthquake forces.

The design forces for each situation are therefore determined first. Base plates with both axial loads and moments are not covered in the aisc specification or the manual of steel construction. An example of a column base which is able to transmit moment and axial force between steel members and concrete substructures at the base of columns is shown in the figure on the left.