Hello every one,
I am doing analysis of Bridge in which elastomeric bearing is modeled as link element between Deck and pier bent. Pier bent portal consist 2 pier and one cap beam on which elastomeric bearing are resting and on elastomeric bearing bridge deck is rest. I am doing non linear time history analysis.
Now (1 )due to elastomeric bearing, moment/forces are not transferred to pier hence bottom moment of pier has not reached Mp value and stresses in pier is very less (at least half of yield stress of Concrete)
(2) Joint Forces at link bottom has reached maximum level of forces and for bearing perfect elastoplastic force displacement curve has given as input of link
(3) Even if pier concrete has not reached at yield stress level CSI Bridge & SAP2000 showing hinges from IO to CP at various time steps.
Why does SAP 2000 Showing hinges in pier even if pier has not undergo plastic moment? Does it is due to yielding of Bearing
Dear Kedar Kumbhojkar
I do not understand what you mean when you say: Showing hinges in pier, because you have defined the plastic hinge yourself. But if you mean why the behavior of plastic hinge reach LS and CP performance levels despite the lack of yield stress at the pier, I think there is a problem with either modeling of elastomeric bearing and its behavior or performance-based design issues. The latter means that either the plastic hinge is not properly modeled (its location, its type or its modeling parameters) or the acceptance criteria of LS and CP performance levels do not comply the modeling parameters of defined plastic hinges.
Hello,
It should be possible you add automatic hinges to your piers. Check it before any changes to your model.
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