Sam et. al.,

The unification of codes is a desire that will never be fullfilled....

The codes have diverged for sound reasons and although they share some points they also diverge in places.

This work remains complex and I suppose mysterious to a certain extent and always will. The need for sound engineering judgement is paramount and one set of rules will never fit all problems, see what happens when one tries to remove thinking from the equation....

http://www.coade.com/ubb/msg_images/coaltrain.pps


As for Daves PVP paper about sustained stress it is copyright protected material and as such cannot be posted for free dissemination. However heres my take on the topic....

http://www.coade.com/newsletters/jan01.pdf
and
http://www.coade.com/newsletters/jul01.pdf