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FW: Deck modeling of bridges

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My first choice would be to use shell elements, since they can account for
1) the flexibility of the deck for in plane deformation (esp. for bridges,
which tend to have long span to width ratios), 2) the mass distribution of
the deck and 3) allow me to obtain an idea of the in plane forces acting on
the deck, which I use for design purposes.

The work comes when I consider the stiffness of the deck shell elements.  If
I am looking at the bridge from a force based seismic design POV, then I
would likely use gross section properties (initially at least)in order to be
conservative using an acceleration RS.  If I am looking at the bridge from a
displacement based POV, I would use cracked sections (reduced stiffness,
same mass).

Hope this helps.

T. Eric Gillham PE

-----Original Message-----
From: José Velásquez [mailto:josemvv(--nospam--at)LatinMail.com]
Sent: Thursday, July 05, 2001 5:47 PM
To: seaint(--nospam--at)seaint.org
Subject: Deck modeling of bridges


Hello friends,

I'd like to know how to model the behavior of a deck when making a dynamic
analysis of a bridge. I use SAP2000 and I assigned constraints to all the
points that belong to the deck, but I guess it's not a good idea to do that,
because it doesn't represent the real behavior of the deck when subjected to
lateral forces. Please send any help. Thanks a lot.

José Velásquez




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http://www.latinmail.com.  Gratuito, latino y en español.


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