Blender to UDK help?

I have a simple model made and I have the collisions set up and correct. Unfortunatley UDK does not seem to want to detect the collisions and it is creating a mesh with no collion. Could somebody tell me how i could fix this? Currently I am using the FBX Exporter in blender and then import to UDK. Find attached the Blender file in case you wish to test and figure out a resolution for this issue. Many thanks. MiddleBridge.blend (1.15 MB)