RAD-i

Purpose: Used to define horizontal curvature of girder " i " in Girder System Projects.

--> Given in girder system input

Lists of tenth point horizontal radii of curvature for girder "i" (feet or meters). Only RAD-1 is given for parallel/concentric girder system layout. RAD-i must be given for each girder "i" for general girder system layout (see GCD-i ). Regions having no curvature are defined with zero values. Positive values indicate horizontal curvature is clockwise from the beginning to the end of the bridge. Default is 0. (defined as straight.)

If the bridge is curved but the girders are made up of straight segments (see condition STRAIGHT FOLDED GIRDERS ), radii data is used only for centrifugal force effects.

Parallel/concentric girder system geometry cannot be used if the combination of RAD-1 and the length of the bridge results in a central angle exceeding 120 degrees. In such a case, the general girder system geometry approach must be used instead.