PLaxis 3D - Surface prescribed displacement

Question

Hello 
 I'm looking for a way to assign displacement fixities perpendicular to a plane which is not perpendicular to the principal axis x, y , z. For example asign radial displacement fixities to a curved surface (tunnel, shaft..) 
 Thank you 
 Malcolm WAKEFIELD

Vasileios Basas · Answer

Hi Malcolm, 
 Assigning a prescribed displacement fixity in a specific direction (i.e., radial) is unfortunately not possible. Unless you are also willing to fix the tangential direction, using the surface prescribed displacement may not work as expected. 
 A suggestion that comes to mind is to define a set of fixed-end anchors with a high axial stiffness on that same plane. This element allows you to "fix" a point against a specific direction that you define yourself. 
 Regardless, I think you should submit this idea to our portal: communities.bentley.com/.../ideas