Actually if you look again at your modeling 1 you will understand that node 11 is restrained on Y and Z respect to the structure, and the pipe (10) is connected to the point 11 through a +Yrod and this model does not reflect what you are looking for.


Assume pipe node is 10
Pipe axis = X

Modeling 1:
-----------
Node 10 Cnode 11 Len=1000 +YROD
Node 11 Y
Node 11 Z