Geometry

Substructure assumes that bridge superstructure is centered on pier cap. Also, it assumes that left and right curb distances are equal.

Cap Length	Cap length refers to the horizontal length of the cap, or the length of the horizontal projection, if the cap is inclined.
Cap Elevation	Cap elevation is defined at its top surface, at left or rightmost ends of the cap.
Centerline of a Cap	For multiple column pier and hammerhead pier the centerline of a cap is a straight line passing through the mid-height of the smaller of the two ends of the cap and is parallel to the top of the cap. For an integral pier, the cap centerline is located at the centerline of the main cap section. For integral caps with no flanges this will be at cap mid-height. Skew Angle (in degrees)
Auto Node Generation Pier Model	The connection point between different components is automatically assigned as a node. Any additional checkpoints you add will also be a node. By default, the node at the bottom of the column is fixed. This means there are no displacements and rotation at this node. You can add a spring matrix at the bottom of the column. You may also specify a hinge at any node in the global Z-direction. When adding a hinge at the node in Z-direction, the moment about this direction will be zero.
Bearing Lines	Bearing lines is where the loads from superstructure are transferred to the substructure. Substructure allows a maximum of two bearing lines. Eccentricity can be given to the bearing line. Positive eccentricity is measured from the pier cap centerline to the positive global Z-axis. Negative eccentricity is measured from the pier cap centerline to the negative global Z-axis. For an inclined pier cap, the bearing point location is measured horizontally, instead of along the pier cap.

Nomenclature
Cap shape: straight	Cap with constant section.
Cap shape: tapered	Cap with tapered segments at both ends.
Cap shape: variable	Cap with different sections along its length.
Start elevation, cap	Elevation at top surface of cap at left end.
End elevation, cap	Elevation at top surface of cap at right end.
Cap depth	Dimension of a cap in global Z-direction.
Cap height	Cap height in global Y-direction.
Cap length	Cap length in global X-direction.
Skew angle	Positive if measured anti-clockwise from normal to bridge traffic direction to the pier centerline.
Reduction of I	Factor of Reduced Moment of Inertia.
Column shape: rectangular	Column with rectangular section.
Column shape: round	Column with circular section.
Column top elevation	Elevation at centerline of a cap where a column meets with it.