GC "Long" Solids Error

I am using GC to carryout parametric option studies of viaduct structures but am having trouble with long BSplines which will not create a solid bridge deck structure. I have attached a simple example which indicates the problem.

 I have a few sample points to define a 3000m long spline. I have then created an example deck "tube" by loft curves along the path. To create a deck solid I then cap the ends but this operation fails. If I shorten the Bspline to approx 250m then it all works. In my final file the deck cross section is more complex but the steps are the same.

 Is their a limit to the size of GC elements? Any other suggestions gratefully received.

Thanks

Antony

 

long_spline.gct