# Thank you Neil Moore

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: Thank you Neil Moore
• From: GORTAIRE ERAZO PAUL ALFONSO <PAGORTAIRE(--nospam--at)puceuio.puce.edu.ec>
• Date: Tue, 4 Jul 2000 19:18:20 -0500
```Neil Moore,

could send us we thanks you very much.

Thank you very much.
Engs: Paul Gortaire and Jorge Ortega.

> ----------
> De: 	Neil Moore[SMTP:nmoore(--nospam--at)innercite.com]
> Enviado el: 	Martes 4 de Julio de 2000 6:26 PM
> Para: 	GORTAIRE ERAZO PAUL ALFONSO
> Asunto: 	RE: Accidental Torsion
>
> Paul and Jorge:
>
> Assuming a one-story building with a rigid diaphragm, concrete  or
> concrete
> block walls:
>
> 1.	Determine the Center of Gravity of the building in one direction.
> 2.	Determine the Center of Rigidity of the building in the same
> direction;
> this is done by determining the rigidity of each shear wall.
> 3.	The difference between the center of gravity and the center of
> rigidity
> is the eccentricity of the building. (in feet or meters).  To this add 5%
> of the width of the building.
> 4.	Multiply this distance times your seismic force.  This is the
> torsional
> moment.
> 5.	Distribute the seismic force to each shear wall per it's rigidity.
> 6.	Distribute the torsional moment to the various shear walls.
> 7.	Add or subtract the two together and that is your seismic force to
> each
> wall.
>
> Repeat this in the other direction.
>
> I may have some old notes that I can send you, as this is fairly basic
> seismic analysis.  Please respond off the listserver.
>
> Neil Moore, S.E.
>
> At 06:05 PM 07/04/2000 -0500, you wrote:
> >> Neil Moore,
> >>
> >Thank you for your help. We are consulting the manner of evaluate the
> >accidental torsion in structures. We are from Ecuador and we can't access
> in
> >the UBC, if you could help us of other manner we will thank you very
> much.
> >
> >Thank you very much.
> >
> >Eng. Paul Gortaire & Jorge Ortega
> >
> >> ----------
> >> De: 	Neil Moore[SMTP:nmoore(--nospam--at)innercite.com]
> >> Responder a: 	seaint(--nospam--at)seaint.org
> >> Enviado el: 	Lunes 3 de Julio de 2000 10:36 PM
> >> Para: 	seaint(--nospam--at)seaint.org
> >> Asunto: 	Re: Accidental Torsion
> >>
> >> Paul and Jorge:
> >>
> >> Refer to sections 1630.6 and 1630.7 of the 1997 UBC.  Note that in
> 1630.7,
> >> the 5% accidential torsion is in addition to your calculated torsion.
> >> Also, refer to sections C105.6 and C105.7 of the 1999 Blue Book
> >> (Recommended Lateral Force Requirements and Commentary)
> >>
> >> Neil Moore, S.E.
> >>
> >>
> >> At 07:38 PM 07/03/2000 -0500, you wrote:
> >> >We would like to know how could calculate "Accidental Torsion" in
> >> >structures.
> >> >
> >> >Very truly of yours,
> >> >Paul Gortaire & Jorge Ortega
> >> >
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