Fixed Column Base Plate Design

The forces and deformations from the structural analyses used to design the column base plate connection are dependent on the choice of the column base plate connection details.

Fixed column base plate design.

Construction of portal frames. The bolts are cast into the concrete base in location tubes or cones and are fitted with anchor plates to prevent pull out. Design of column base plates typical column bases as shown below consist of a single plate fillet welded to the end of the column and attached to the foundation with four holding down bolts. Aisc home american institute of steel construction.

The graphic of the fixed base column to the left is just an example of what the. Of the column base plate connection in the elastic and plastic ranges and for seismic loading possibly even the cyclic force deformation relations. The pr gressi n f beam c lumn l adings in rder f in creasing m ments is presented in f ur l ad cases. The plan dimensions of the slab base plate may now be selected to provide the above area and also so that the projections a and b beyond the rectangle circumscribing the column area nearly equal fig.

Many of the stress and deflection equations and calculators referenced from. Additional plates on the column and anchor rods required. Design bearing strength of concrete 0 45 ƒ ck. The follow web pages contain engineering design calculators that will determine the amount of deflection and stress a flat plate of known thickness will deflect under the specified load and distribution.

However frames with fixed base may require a more expensive foundation. 3 22 c lumn flange thickness in. A factored load on the column design bearing strength of concrete. Base plate tensi n interface cantilever parallel t m ment directi n in.

Adding stiffeners and other plates to a base plate assembly is labor intensive compared to using a thicker base plate that could eliminate the need for these additional stiffener plates. Fixed base columns must also be straight columns and are typically deeper at its base in comparison to pinned base. Typically fixed base columns are recessed below finished floor. Case a is a l ad case with axial c mpressi n and shear.

Frames with pinned bases are heavier than those having fixity at the bases. Flat plates stress deflection equations and calculators. Engineering calculators menu engineering analysis menu. The base plate this will result in less labor to fabricate and will result in a more economic design.