Fixed Column Base Plate Design

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.

Fixed column base plate design.

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. Fixed base columns must also be straight columns and are typically deeper at its base in comparison to pinned base. Connections and element design apex connection column base bracing connection eaves connections purlins. Base plate tensi n interface cantilever parallel t m ment directi n in.

Beam column base plate design. 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. Flat plates stress deflection equations and calculators. Of the column base plate connection in the elastic and plastic ranges and for seismic loading possibly even the cyclic force deformation relations.

Frames with pinned bases are heavier than those having fixity at the bases. 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. Aisc home american institute of steel construction. Many of the stress and deflection equations and calculators referenced from.

The bolts are cast into the concrete base in location tubes or cones and are fitted with anchor plates to prevent pull out. 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. 3 22 c lumn flange thickness in. Engineering calculators menu engineering analysis menu.

Where ƒ ck characteristic strength of concrete. Case a is a l ad case with axial c mpressi n and shear. Design bearing strength of concrete 0 45 ƒ ck. A factored load on the column design bearing strength of concrete.

However frames with fixed base may require a more expensive foundation. Construction of portal frames. The base plate this will result in less labor to fabricate and will result in a more economic design. The graphic of the fixed base column to the left is just an example of what the.