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Re: Wind loading

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I'm sure you folks have seen this.  I went to this seminar one time where the
speaker was talking about retrofitting a medium height building (I believe 20
+/- storeys) in NYC.  The original plans contain one drawing which shows the
lateral load resistance system consisting of the adjacent buildings.  The
speaker then showed a picture of the building today with NO adjacent buildings.
I thought that was funny.


Rick.Drake(--nospam--at) on 10/14/99 02:17:41 PM

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To:   seaint(--nospam--at)
cc:    (bcc: Hector Morera/NYC/AmmannWhitney)
Fax to:
Subject:  Re: Wind loading

ASCE 7-95 Section 6.5.4 does address the situation.  It does not allow shielding
by adjacent structures.  You must calculate the design wind forces on each
structure as if the nearby structures don't exist.  Although this may appear to
be overly conservative, the only apparent alternative appears to be ASCE 7-95
Section 6.4.3, Wind Tunnel Testing.

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA


"Bohm, Gabriel" <GBohm(--nospam--at)> on 10/14/99 11:09:25 AM

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cc:    (bcc: Rick Drake/AV/FD/FluorCorp)

Subject:  Wind loading

Consider a solid wall, with perpendicular wind. ASCE 7 tells us how to
calculate wind pressures. So far, so good.

Now, let's place an open structure 10 feet in front of the wall, parallel to
the wall. The open structure consists of columns, beams & braces and has
ties to the wall. The wind is still perpendicular. How do you calculate wind
loads on both wall and open structure? ASCE 7 does not address this

Let's further complicate things by placing vessels, platforms, and piping in
the 10 foot space between the open structure and the wall.

What is the best method to assess the wind loading on open structure,
equipment and wall without being overly conservative? How do you account for
shielding? Are there any published articles that address this situation?
Your thoughts will be much appreciated.


Gabe Bohm
San Dimas, California