First I would like to thank you for reporting these issues. It took us a while to see your case since we have moved the forum to a more AutoPIPE specific forum. So please log any new questions to our new location at:
http://communities.bentley.com/Communities/Other_Communities/AutoPIPE_StressISO_WinNOZL_PlantFLOW__PULS/f/42936.aspx
You can continue to use this forum for this issue. As far as combinations, I would like to point out that the combinations are NOT part of the AutoPIPE model. These are saved to a separate file (.CMB). This is useful for copying combinations from one model to another. If you are very worried about losing the combinations, you just need to backup your CMB file.
We have some tools in the combination dialog: Delete all Reset defaults only Combination options
If some load cases were analyzed, but no combinations are generated, then the Reset may work. If that did not work, use the Delete All and follow by Reset. You do not need to reanalyze the model. The options "Disable auto code combinations" and "Disable auto non-code combinations" are useful if you do not want AutoPIPE to add default combinations.
If you have a gap downward, that means your pipe is not resting on the support in the cold condition. In this case the gap setting "Weightless" and "As built" should be set properly. "As built" means you measured the gap in the field in cold condition and that includes the GR displacements.
It is really rare to have a non-zero gap downward. This usually happens when your support settles. Gap downward is the max displacement the pipe can move down, so a zero value would make a lot of sense. If you specified a Gap upward, then the pipe may or may not move up depending on the load. It is quite common for pipe to move up at V-stop and Guide supports.
If you want to prevent your pipe from moving upward, you would to specify a 0 gap in the upward direction.
I am sorry that the link did not work. The proper procedure is to first click on:
"Join AutoPIPE StressIso WinNOZL PlantFLOW & PULS"
at the link below:
http://communities.bentley.com/Communities/Other_Communities/AutoPIPE_StressISO_WinNOZL_PlantFLOW__PULS/default.aspx
After joining, select the AutoPIPE forum link on the right side or click at the following link: