We could be discussing terminology here ...
Assuming the "Y" axis is vertical, then:
- To me a fixed support is an anchor.
- If you pipe is just sitting on a support, that would be a +Y (specification of friction is optional).
- If the pipe is on a support and cannot move up or down, that would be a Y support (specification of friction is optional.
Friction acts in a plane perpendicular to the support, so for example, the +Y above would incur reactions in the X and Z directions if friction is applied.
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Regards,
Richard Ay - Consultant