Steel Column Base Plate Design Moment

Whether each t stub is in tension or compression depends on the magnitudes of the axial force and bending moment.

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. Engineers must refer to textbooks for design information though not all texts cover this case. 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. Stiffened base plate connections and column bases cast in pockets are other options available.

Column bases for instance moment frames which resist wind or earthquake forces. Base plates with both axial loads and moments are not covered in the aisc specification or the manual of steel construction. This results in base plate details that are expensive difficult to. It is designed to support gravity loads bending moments and shear forces.

The column base connection is one of the critical connections in a steel structure. Distribution of forces at the column base the design moment resistance of the base plate depends on the resistances of two t stubs one for each flange of the column. The example shows a column base with an unstiffened base plate.