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Re: AASHTO vs pushover

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Mete,

Basically the capacity obtained from capacity curve (push-over analyses) has
to be consistent with the one obtained from the spectral (?) analysis.

There is a similar study " Behavior and failure analysis of a multiple-frame
highway bridge in the 1994 Northridge earthquake", you can download it from
http://peer.berkeley.edu/publications/PEER-199808/PEER9808.pdf

Hope this helps.

Have a nice day,

Alper Ucak



----- Original Message -----
From: "Mete Baykir" <MBaykir(--nospam--at)yukselproje.com.tr>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, March 19, 2003 10:17 AM
Subject: AASHTO vs pushover


Hi list,

Having done a seismic analysis (spectral), i came out with very high axial
forces (tension) (practically impossible # of anchorages) and like 2% of
longitudinal reinforcement on bridge piles.
Next, i did a pushover analysis simply providing a minimum long. reinf. of
1% at the plastic hinging region(s). The axial loads drastically dropped,
the moments were increased (when compared with AASHTO criteria) but again in
an acceptable range.
and then i increased the long. reinf. to 2% (which is found by aashto
solution).... the piles no longer carried the original moments which are
found by AASHTO criteria.
is AASHTO really reliable at this perspective? or am i doing something
wrong? is there any provisions for the long. reinforcement ratio at plastic
hinging regions?
any comment is going to be of great help. thanx..

mete


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