I have a curved bridge in plan (X-Z plane, Y is vertical)with intermediate piers perpendicular to the curve.  BETA angles are used to correctly rotate the columns into proper local coordinate system (local Z is perpendicular to curve).

I need to get top of column displacement along the pier (in the local column coordinate system) instead of the typical global displacement for response spectra analysis.  Does anyone have a solution to this?

One alternative would be to use the command MOVE OBJECT to rotate the column to global coordinates.  The downside to this solution would be changing BETA angles and the EQ direction for each run and re-running GT-STRUDL for each pier.

Any advice is appreciated.

Thanks,

TSM