F-5.1 Base Plates
Columns shall be provided with base plates capable of distributing the compressive forces in the compressed parts of the column over a bearing area such that the bearing pressure on the foundation does not exceed the design strength of the point. The design strength
of the joint between the base plate and the foundation shall be determined taking account of the material properties and dimensions of both the grout and the concrete foundation.
F-5.2 Holding Down Bolts (Anchor Bolts)
F-5.2.1
Holding down bolts shall be provided if necessary to resist the effects of the design loads.
They shall be designed to resist tension due to uplift forces and tension due to bending moments as appropriate.
F-5.2.2
When calculating the tension forces due to bending moments, the lever arm shall not be taken as more than the distance between the centroid of the bearing area on the compression side and the centroid of the bolt group on the tension side, taking the tolerances on the positions of the holding down bolts into account.
F-5.2.3
Holding down bolts shall either be anchored into the foundation by a hook or by a washer plate or by some other appropriate load distributing member embedded in the concrete.
F-5.2.4
If no special elements for resisting the shear force are provided, such as block or bar shear connectors, it shall be demonstrated that sufficient resistance to transfer the shear force between the column and the foundation is provided by one of the following:
- a) Frictional resistance of the joint between the base plate and the foundation.
- b) Shear resistance of the holding down bolts.
- c) Shear resistance of the surrounding part of the foundation.
- d) Shear and bearing resistance of the shear key plates welded to the base plate and embedded in the pedestal/foundation.