how to mesh intersecting surfaces

Hi at all,

 

I have a simple problem:

 

two planar surfaces intersect each other. From the top it Looks like a cross, so two crossing lines have been extruded to get these two surfaces.

 

Hyperworks does not see that there is an edge due to intersection. So when I mesh the surfaces, I get two independet meshes. What I want to get is one mesh, so nodes have to be exactly at the intersection-line/edge and are shared of both surfaces.

 

Do you have any hints for me?

 

Thanks in advance.