XSNB, YSNB, ZSNB - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies snubbers, which are restraints that engage only during quick movements such as those induced by a shock. They only act on the piping system in the occasional load case. Snubbers can be preceded by a (+) or a (-).

Because CAESAR II cannot perform load stepping, static analysis with snubbers requires a preliminary manual analysis to determine thermal movements. Here is the procedure.

  1. Analyze a hot operating case without your occasional loads.

  2. Take the displacements from this analysis at the snubbers and put them back into the input.

  3. At the location where the snubbers are defined, define a CNODE and put these displacements on the CNODE.

  4. For your real analysis, apply these displacements to all load cases. Because they are on the far side of the snubber, they won't affect anything unless the load case is called OCC, which activates the snubber stiffness.

So:

  • When you run your standard OPE case (W+T1+P1+D1), the snubber node displaces as before. There are no restraints because the load case is OPE, not OCC.

  • When you run the operating + occasional case (W+T1+P1+D1+WIND1), the snubber node displaces along with its CNODE. There is a difference in these two displacements due to the WIND1 load and the snubber stiffness, because the case is now set as OCC.