It seems the West Coast is using the IBC with the local building inspectors following the wording in the code that allow's the IAS system. I my self think that IAS shop program in some ways is in-fact better than the AISC program. But on the EAST Coast the local building inspector "SEEM TO FOLLOW WHAT EVER THE ENGINNER SAYS". An the AISC has convinced the East Coast enginner's that their system, is the best thing since sliced bread, if you know what I mean. So the building inspector just defers to the Enginneer's wishes. It would really be nice to see all these groups- AISC, IBC, State, Federal, AWS- Sit down for once in for all an say that we going to ALL USE the same program across the country. But I don't think anyone is willing to give up their piece of the pie. So we all go along, trying to figure out what to use when you bid a job, an pray it doesn't come back to bite you later.
Greg