Word to describe the structure of a paper
In the context of wanting to point out exceptions that are not necessarily bad, the single adjective to describe the structure to which you refer is 'conventional'.
There are very strong arguments for departing from the convention of leaving readers waiting to the end of a long paper to find out what your conclusions were, so it would be as well, in your context, to avoid words that imply that such a structure is 'normal' or 'preferred'.