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Re: UBC97-- Redundancy Factor

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In a recent edition of the ASCE jourlan of Structural Engineering there was
an interesting article by Bertero & Bertero on the advantages of
redundancy.  The looked at a number of common situations from a
probablistic point of view.

When the members were designed to perform elastically they found, not
supprisingly, that redundancy improves system reliability.

What was interesting was the conclusion that when the members were assumed
to be loaded into the inelastic region that redundancy could actually
degrade system reliability.  As I understand it the greater the number of
members means that there is a greater likely hood that one of the members
will fail and that this failure would more likely lead to a failure of the
system.  You should read the article since it is thought provoking.

Mark Gilligan