Custom (Abutment only) [CBS]

A custom footing that sits under an abutment. In addition to the footing geometry it carries the wing-wall and back-wall thicknesses of the abutment above, so the footing plan follows the abutment footprint (including its wing walls and end extensions). Use it when an abutment needs a footing whose outline is driven by the abutment geometry rather than a simple rectangle.

General

Abutment: The abutment this footing is placed under. The footing is positioned and shaped from the selected abutment's geometry. The user must provide a value.

Longitudinal Offset: Longitudinal position of the footing along the Projected Grade Line (PGL), where 0 refers to the reference point of the abutment above. A negative value shifts the footing down-station; a positive value shifts it up-station.

Transverse Offset: Transverse position of the footing center relative to the abutment. A value of 0 places it at the abutment center; a positive value offsets it to the right when looking up-station along the PGL.

Material: Material assigned to the footing. (Read-only)

Bottom Elevation Calculation Method [Constant Elevation/Constant Depth]: Chooses how the bottom of the footing is located. Constant Elevation fixes the footing bottom at the specified Bottom Elevation; Constant Depth keeps the footing a fixed Depth below the abutment bottom.

Depth: The thickness of the footing measured from its top to its bottom. Used when Bottom Elevation Calculation Method is Constant Depth.

Bottom Elevation: The elevation of the footing's bottom face with respect to the Global Coordinate System. Used when Bottom Elevation Calculation Method is Constant Elevation.

Footing Top Slope(Outside Abutment Region) [Match Abutment Slope/Flat]: Controls the top surface of the portion of the footing that extends beyond the abutment footprint. Match Abutment Slope continues the abutment's top slope across the full footing; Flat keeps the top horizontal outside the abutment region.

Geometry

Right Wing Wall Inside Thickness: Thickness of the right wing wall on its inside face, used to shape the footing outline under the wing wall.

Right Wing Wall Outside Thickness: Thickness of the right wing wall on its outside face.

Back Wall Inside Thickness: Thickness of the abutment back wall on its inside face.

Back Wall Outside Thickness: Thickness of the abutment back wall on its outside face.

Left Wing Wall Inside Thickness: Thickness of the left wing wall on its inside face.

Left Wing Wall Outside Thickness: Thickness of the left wing wall on its outside face.

Right End Extend: Length by which the footing extends beyond the abutment at the right end (transverse direction, looking up-station).

Left End Extend: Length by which the footing extends beyond the abutment at the left end.

Right End Skew: Skew angle applied to the right end face of the footing.

Left End Skew: Skew angle applied to the left end face of the footing.

FEM

Generate FEM? [Yes/No]: Setting this to No disables the analytical (finite-element) representation of the footing.

Rigid Section: When enabled, the footing is treated as a rigid section in the analytical model.

FEM Type [Shell/Stiffness Matrix]: Selects how the footing is modeled: Shell meshes the footing into shell elements; Stiffness Matrix represents it with a user-supplied 6x6 stiffness matrix.

Mesh Size: Sets the maximum distance for a single finite-element line when meshing the footing.

Min. # of Strips in Long. Dir.: Minimum number of mesh strips generated along the longitudinal direction.

Min. # of Strips in Trans. Dir.: Minimum number of mesh strips generated along the transverse direction.

6x6 Stiffness Matrix: The user-supplied stiffness matrix used when FEM Type is Stiffness Matrix.

Additional Result Extraction Point in Long. Dir.: Adds an extra result-extraction location along the longitudinal direction.

Additional Result Extraction Point in Trans. Dir.: Adds an extra result-extraction location along the transverse direction.

Mesh Algorithm [GridMesh/MeshAdapt/Automatic/Initial mesh only/Delaunay/Frontal Delaunay/Frontal Delaunay for Quads/Packing of Parallelograms/Quasi structured Quad]: Selects the meshing algorithm used to generate the footing's finite-element mesh.

FEM and Display

Show 3D [No/Yes]: When Yes, the footing is visible in the 3D view.

Flexural Reinforcement

Longitudinal Direction Reinforcements: Tabular list of longitudinal (along-PGL) rebar layers in the footing.

Transverse Direction Reinforcements: Tabular list of transverse (perpendicular-to-PGL) rebar layers in the footing.

Shear Reinforcement

Shear Reinforcement [Include/Ignore]: Enables or disables shear reinforcement modeling in the footing.

Shear Reinforcement Profile in Longitudinal Direction: Rebar profile used for longitudinal shear reinforcement.

Shear Reinforcement Profile in Transverse Direction: Rebar profile used for transverse shear reinforcement.

Shear Reinforcement Material: Material assigned to shear reinforcement.

Spacing in Longitudinal Direction: Spacing of shear reinforcement in the longitudinal direction.

Spacing in Transverse Direction: Spacing of shear reinforcement in the transverse direction.

Distance Between Legs in Longitudinal Direction: Spacing between legs of shear reinforcement in the longitudinal direction (center-to-center).

Distance Between Legs in Transverse Direction: Spacing between legs of shear reinforcement in the transverse direction (center-to-center).

Side Reinforcement

Longitudinal Direction Side Reinforcements: Tabular list of longitudinal side-face reinforcement rows.

Transverse Direction Side Reinforcements: Tabular list of transverse side-face reinforcement rows.

Quantities

The following are computed automatically from the footing geometry and reinforcement inputs and are reported for take-off. (Read-only)

Bottom Surface Area: Area of the footing's bottom face. (Read-only)

Top Surface Area: Area of the footing's top face. (Read-only)

Total Pile Surface Area: Combined surface area of the piles under the footing. (Read-only)

Net Bottom Surface Area(excluding piles): Bottom face area with the pile footprints removed. (Read-only)

Side Surface Area: Area of the footing's side (edge) faces. (Read-only)

Top Surface Perimeter: Perimeter of the footing's top face. (Read-only)

Depth: Depth of the footing as reported for quantities. (Read-only)

Top Surface Width: Width of the footing's top face. (Read-only)

Top Surface Height: Height (longitudinal extent) of the footing's top face. (Read-only)

Rebar Calculation Method [By Density/By Length]: Chooses how reinforcement quantities are estimated: By Density uses a rebar density per unit volume; By Length sums explicit reinforcement lengths.

Rebar Density(per cubic yard): Reinforcement weight per cubic yard, used when Rebar Calculation Method is By Density.

Rebar Weight (By Density): Total reinforcement weight computed from the density. (Read-only)

Longitudinal Reinforcement Length: Total length of longitudinal reinforcement, used when Rebar Calculation Method is By Length. (Read-only)

Transverse Reinforcement Length: Total length of transverse reinforcement. (Read-only)

Longitudinal Reinforcement Weight: Weight of the longitudinal reinforcement. (Read-only)

Transverse Reinforcement Weight: Weight of the transverse reinforcement. (Read-only)

Total Rebar Weight (By Length): Total reinforcement weight computed from explicit lengths. (Read-only)

Volume: Concrete volume of the footing. (Read-only)

Weight: Concrete weight of the footing. (Read-only)