RISAFoundation - RISA Technologies

Footings - ResultsThese parameters define the minimum and maximum length, width and thickness for the footing. When RISAFoundationsizes the footing, it optimizes for the smallest footing that fits within the parameters and does not exceed the allowable soilbearing pressure. RISAFoundation favors footings with the lowest length/width ratio (as close to a square as possible).If you are investigating an existing footing size that you don't want RISAFoundation to change, you may either specify thesame maximum and minimum length, width and/or thickness OR specify the maximum values and set the design incrementsto zero.Force Footing to be SquareChecking the box in the Force Square column will restrict the design to square footings only.Force Top BarsThe Force Top Bars option allows the user to to indicate that top bars are required for this footing even for cases where thefooting does not experience significant uplift or negative moment. One reason for checking this box would be to spread outthe Temperature / Shrinkage reinforcement betwee the top and bottom layers of steel.Footing PedestalThe Pedestal tab contains the basic information that will control the width and height of the pedestal. It will also control thelocation of the pedestal within of the footing if you have an eccentric footing.The pedestal dimensions are entered in these fields. The x dim (px) and z dim (px) values are the pedestal dimensions parallelto the local x and z axes, respectively. The height is the distance from the upper surface of the footing to the top of thepedestal. The pedestal location may be controlled in the Boundaries and Eccentricities section discussed below.Boundaries and EccentricitiesWhen specifying an eccentric pedestal the eX and eZ values are the offsets from the center of the footing in the local X and Zdirections, respectively. These values may be either positive or negative.You may use the BLx or BLz entries to set boundary lines for the footing in one or two directions or you may specify thepedestal eccentricity from the centroid of the footing. If you set boundary lines, RISAFoundation will keep the sides of thefooting from violating the boundary. These values may be either positive or negative.Soil PropertiesThe Soil Properties tab contains the basic information related to design for soil bearing.General Reference Manual 39