Steel Column Base Plate Design Moment

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.

Steel column base plate design moment.

This results in base plate details that are expensive difficult to. Base plates with both axial loads and moments are not covered in the aisc specification or the manual of steel construction. The column base connection is one of the critical connections in a steel structure. 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.

Engineers must refer to textbooks for design information though not all texts cover this case. Two general approaches exist for design one based on the elastic behavior and one based on the ultimate. Stiffened base plate connections and column bases cast in pockets are other options available. 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.

Whether each t stub is in tension or compression depends on the magnitudes of the axial force and bending moment. The example shows a column base with an unstiffened base plate. The design forces for each situation are therefore determined first.