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RE: Load combinations with 30% Wind

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Bill,
I am not aware of any studies specifically addressing this type of structure. Elevated structures present the additional problem of dynamic effects.

Regards,
Harold Sprague





From: "Scott, William N." <William.Scott(--nospam--at)veco.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: RE: Load combinations with 30% Wind
Date: Tue, 5 Sep 2006 15:05:16 -0800

Harold,

Structures that are elevated 5 to 10 feet above grade.

Bill

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Tuesday, September 05, 2006 1:54 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Load combinations with 30% Wind

Elevated structures make up a huge category.  Can you narrow it down a bit?

Regards,
Harold Sprague





>From: "Scott, William N." <William.Scott(--nospam--at)veco.com>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: seaint(--nospam--at)seaint.org
>Subject: RE: Load combinations with 30% Wind
>Date: Tue, 5 Sep 2006 07:49:50 -0800
>
>Harold,
>
>Have you seen any wind load information for elevated structures?
>
>Bill
>
>-----Original Message-----
>From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
>Sent: Tuesday, September 05, 2006 7:34 AM
>To: seaint(--nospam--at)seaint.org
>Subject: RE: Load combinations with 30% Wind
>
>Tarik,
>Various industries have had conventions regarding adjustments in wind
>pressures or velocities that have seldom withstood scrutiny.  The proper
>way
>
>of looking into this is to use a risk based study, but this is a lot of
>work.  And it varies a lot with the type of structure within a
>petrochemical
>
>facility.
>
>You will find guidance in the Commentary of the ASCE 7.  Referring
>specifically to the ASCE 7-05, you will need to reference C-6.5 beginning
>on
>
>page 283.  It will reference Table's C6-6 and C6-7 on page 318.  You will
>note that you can present the probabilities in a number of ways.  Most
>people look at the mean recurrence interval for exposure over a given time
>period.
>
>I would recommend a lot of study in probabilities for environmental loads. >It is easy to misinterpret. Also bear in mind that what is being modified >are wind velocities not wind pressures. Pressure varies with the square of
>wind velocity.
>
>You may also want to reference a paper by Boggs and Peterka, "Wind Speeds
>for Design of Temporary Structures", ASCE Structures Congress 1992.
>
>http://www.cppwind.com/papers/structural/temporarystructures.pdf
>
>
>Regards,
>Harold Sprague
>
>
>
>
>
> >From: TBerair(--nospam--at)technip.com
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: RE: Load combinations with 30% Wind
> >Date: Tue, 5 Sep 2006 17:04:19 +0200
> >
> >Bill,
> >
> >I looked into ASCE-7, IBC, UBC-97 and even into "Wind Load and Achor Bolt
> >Design for Petrochemical Facilities" which is an ASCE 1998 publication,
> >but found nothing about the Testing, Maintenance or even Erection
> >conditions.
> >
> >
> >
> >Tarik BERAIR, PE,
> >CIVIL ENGINEERING DEPARTMENT
> >TECHNIP France
> >PARIS-LA-DEFENSE
> >Tel: +33-(0)1-40-90-11-13
> >Email: tberair(--nospam--at)technip.com
> >
> >
> >
> >
> >
> >
> >
> >"Scott, William N." <William.Scott(--nospam--at)veco.com>
> >05/09/2006 16:53
> >Please respond to seaint
> >
> >         To:     seaint(--nospam--at)seaint.org
> >         cc:
> >         Subject:        RE: Load combinations with 30% Wind
> >
> >
> >Try American Society of Civil Engineers ASCE-7 2005.
> >
> >Bill
> >
> >
> >From: TBerair(--nospam--at)technip.com [mailto:TBerair(--nospam--at)technip.com]
> >Sent: Tuesday, September 05, 2006 6:28 AM
> >To: seaint(--nospam--at)seaint.org
> >Subject: Load combinations with 30% Wind
> >
> >
> >Dear colleagues,
> >
> >We have been used to consider only 30% of the Wind when establishing load
> >combinations for Abnormal Operating, Testing or Maintenance conditions
>(we
> >design mainly downstream petrochemical facilities). I am investigating
>the
> >origin of such an assumption in all US codes, but turned unsuccessful.
> >Does anyone know a code that is mentioning this or any Load Combination
> >for Testing or Maintenance?
> >
> >Regards
> >
> >Tarik BERAIR, PE,
> >CIVIL ENGINEERING DEPARTMENT
> >TECHNIP France
> >PARIS-LA-DEFENSE
> >Tel: +33-(0)1-40-90-11-13
> >Email: tberair(--nospam--at)technip.com
> >
>
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