Dear sir:
When we do static seimic analysis by CAESAR II,we find that we can not define the snubber rightly in model.Our train model is very simply,refer to node10,it's a fix point,there are 5meters(X direction) pipe(OD219*8),node20 is end of the pipe,we add a XSNB at node20,the uniform loads is 0.2g,0.2g,0.2g.Our result as following:
CASE 2 (OCC) W+T1+P1+U1
CASE 4 (OCC) W+P1+U1
10 Displ. Reaction
2 OCC -778937. 407. -1629. 0. 4074. 1018.
4 OCC 343. 407. -1629. 0. 4074. 1018.
20 Flex XSNB
2 OCC 779342. 0. 0. 0. 0. 0.
4 OCC 65. 0. 0. 0. 0. 0.
We can find that in case2,the XSNB is treated as X restraint and the expantion load act on XSNB.But we only want the result of seimic.According to COADE PIPE STRESS ANALYSIS SEMINAR NOTES,when there is non-linear restraint in model,we should use OPE+WIND(or Uniform load) to consider the Gap or frict.But how can we define the snubber to avoid expantion load acting on snubber?
Thanks for your share in advance!
Regards!