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A few days ago C. Wright made a long statement
about the subject. I agree with it. Only because the structure begins
to yield somewhere, it doesn't mean there will be a progression
to failure at that location. This is a fact of life, especially
visible in structural dynamics. Yielding means loss of stiffness,
which often leads to redistribution of internal forces.
There is another problem associated with it and almost universally
ignored. Engineers use "minimum guaranteed values" for yield and ultimate.
This is fine if the objective is to protect your hide. But when you really
want to know the failing loads based on most probable material properties,
then you have little chance. The mean tested values are some 20 to 30 percent
larger than min. guaranteed for most constructional steels.
Sincerely, Gregory