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STAAD Commands and Input Instructions
Section 5
5-416
Design Procedure
The following sequential design procedure is followed:
1) Footing size is calculated on the basis of the load directly
available from the analysis results (support reactions) and user
specified Allowable Soil Pressure. No factor is used on the
support reactions.
2) The footing size obtained from 1) and the FACTORED LOAD
is utilized to calculate soil reactions.
FACTORED LOAD = ACTUAL REACTION X Parameter FFAC
The user may provide a desired value for the parameter FFAC.
3) Footing depth and reinforcement details are based on soil
reactions calculated per 2) above.
4) Dowel bar requirements and development lengths are
calculated and reported in the output.
Following parameters are available for footing design.
Design Parameters
Parameter Default Description
Name Value
FY 60,000 pi Yield strength for
reinforcement steel.
FC 3,000 pi Compressive Strength of
Concrete.
CLEAR 3.0 in. Clear cover for slab
reinforcement.
REINF Number 9 bar Main reinforcement bar size for
slab design.
FFAC 1.0 Load factor for concrete
design.
BC 3000 psf Soil bearing capacity.
RATIO 1.0 Ratio between slab sides.