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RE: Drift at top and rotation/curvature

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Hm-m-m.

Unless I have forgotten something from Theory of Plasticity, rotation in a 
plastic hinge is going to continue indefinitely without increase in moment 
(until strain hardening range is reached) as long as the moment (plastic 
moment) doesn't unload into an elastic state.  (Same as elongation in a 
tension member stressed to yield.  Elongation will continue indefinitely 
without increase in load until strain hardening range is reached.)

A. Roger Turk, P.E.(Structural)
Tucson, Arizona