@HenryQ: You've also asked that question here:
http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=38273#Post38273and I think I have answered that already. Study material behaviour and the applicable piping codes! Let me give you an extra clue: Does FRP have elestic-plastic behaviour like steel does?
@machoguy: First of all you're not using the best code for FRP analysis. See my answer to HenryQ above and all other topics in this forum related to FRP stress in OPE case. It has been asked and answered numerous times.
In the config there are a couple of settings regarding FRP. Thermal expansion coefficient is the most important one. A second one is the FRP config file, but that file is not important as you can enter the material properties in the normal input on the first element. And you can enter the type of laminate used for tees and such, but this can be important depending on the code, but not important in general.
What is important for FRP piping:
- setting the expansion coefficient in the config
- using the correct piping code (UKOOA, BS7159, ISO14692)
- using the correct material properties (check the code what to use).
Most important:
- read up on FRP material properties and properties definitions.
- read up on FRP piping codes.