Hi everybody! I'm analyzing with Patran and Nastran a multi-arch structure where the arches are made of a sandwich material (so I used 3D elements for the core e 2D elements for the upper and lower faces). The problem that I have is related to the boundary condition because as you can see in the picture at the end of each arch there will be a hinge condition, in order to have a rotation around one axis, and that's why I used also RBE2. The problem is when I've to set the boundary condition for the arches rotated by 45° with respect to the axis Y-axis. I thought to use a different Coord system but it seems useless because when I run the analysis there is a difference between the arches aligned with the principal Coord system of Patran and the other rotated by 45°. I hope that is clear my message.
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