BeamWithHinhes

Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe

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vallenato
Posts: 6
Joined: Mon Nov 19, 2007 8:27 am

BeamWithHinhes

Post by vallenato » Mon Jun 16, 2008 5:43 am

Hello.

Does anyone know if there is a limit value for Lp in the BeamWithHinges element? It seem to me that Lp should be < L/4 or L/8, for elements on sinhle or double curvature, respectively. Although this is not specifically mentioned in the paper.

Thanks,
L.

peacemaker
Posts: 9
Joined: Thu Mar 29, 2007 2:24 pm
Location: IRAN

flexure-shear interaction displacement -based beam - column

Post by peacemaker » Mon Jun 16, 2008 9:36 am

hi to all !
would u plz help me for determination of hinge length for a steel section ?
and another question :
do u have any information about this new section elemnt :
flexure-shear interaction displacement -based beam - column element ?
if u have , plz give me an example for steel section .
tank u all .

silvia
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Location: Degenkolb Engineers
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Post by silvia » Mon Jun 16, 2008 2:36 pm

the hinge length is your choice.
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104

mhscott
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Location: Corvallis, Oregon USA
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Post by mhscott » Wed Jun 18, 2008 6:38 am

In theory, there are no restrictions on how large the plastic hinge lengths can be.

peacemaker
Posts: 9
Joined: Thu Mar 29, 2007 2:24 pm
Location: IRAN

Post by peacemaker » Wed Jun 18, 2008 7:25 am

but i think the value of hinge length can chenge the result of the analysis .
is there any logical assumption for hinge length ?
if there isn't , how can i rely on my model ?!

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my second question had no answer .
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thank u silvia & m.scott .

silvia
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Post by silvia » Wed Jun 18, 2008 5:18 pm

1. you should stay within the element length. bad models will give you bad results.
2. this is an intersting research topic, you should read up on the literature.
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104

mhscott
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Post by mhscott » Mon Jun 23, 2008 12:51 pm

For steel members 1-2 times the section depth is a reasonable assumption for the plastic hinge length.

There are empirical formulas to approximate the plastic hinge length of RC members. See articles written by Paulay and Priestley.

gfermandois
Posts: 6
Joined: Wed Jun 21, 2006 7:12 pm
Location: Chilean Steel Institute

Plastic Hinge Length

Post by gfermandois » Thu Sep 18, 2008 10:40 am

mhscott wrote:For steel members 1-2 times the section depth is a reasonable assumption for the plastic hinge length.

There are empirical formulas to approximate the plastic hinge length of RC members. See articles written by Paulay and Priestley.
Dr. Scott, do you have any reference that points out more clearly the criteria to select the plastic hinge length for steel members?

Thank you!
Gaston Fermandois C.
Universidad Tecnica Federico Santa Maria
Valparaiso, Chile

mhscott
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Post by mhscott » Thu Sep 18, 2008 2:21 pm

I can't think of any off the top of my head, but you may want to search for articles from the following authors:

C. W. Roeder
D. W. White
W. F. Chen

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