RM Bridge Modeler Help

Axis - Plan view, spiral

A spiral element is connected to the previous axis element.

SettingDescription
Radio buttons Parameter or Length
Radio buttons Radius or Curvature

A spiral can be defined by a radius or a curvature. Due to the habit  in the surveying works the default selection is "Radius".

Note: Compulsory condition for the definition is a2 × k2 ≤ π,where a is the spiral parameter and k the curvature.
Input of a radius:
Input of curvature: