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RE: wind tunell

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If the 40 story building is concrete, wind will never govern for the main building design if you are in zone 2A or above. It has to be a really odd shape even in zone 1 (or notional loads for BS users) for wind to govern the design of the main structure.
However, the glass and cladding designer will absolutely need to know how the forces get distributed for his elements. I have seen local loads in excess of six times the average load in some buildings.
best regards
Syed A Masroor
Cons Str Engrs
Karachi, Pakistan 

Date: Wed, 28 Apr 2010 12:15:44 -0700
From: mjnasar(--nospam--at)
Subject: wind tunell
To: seaint(--nospam--at)

yes i am referring to wind tunnel testing for 40 storey building
columns are rcc

From: Harold Sprague <spraguehope(--nospam--at)>
To: seaint(--nospam--at)
Sent: Wed, April 28, 2010 4:49:18 PM
Subject: RE: Request for IS 9178 & IS 11592

1.  Are you referring to wind tunnel testing or what is essentially vortex effect?
2.  Are your columns steel, composite, or reinforced concrete?

Regards, Harold Sprague


Date: Wed, 28 Apr 2010 02:19:31 -0700
From: mjnasar(--nospam--at)
Subject: Fw: Request for IS 9178 & IS 11592
To: seaint(--nospam--at)

dear all

we are working in high rise building please can any explain what is significence of  following
1. wind tunneling
2. Axial shortening of columns
thanks in advance

----- Forwarded Message ----
From: Mr.Bhimani <mrbhimani(--nospam--at)>
To: engineeringcivil(--nospam--at); seaint(--nospam--at); general(--nospam--at)
Sent: Wed, April 21, 2010 3:45:03 PM
Subject: Request for IS 9178 & IS 11592

Dear All,
Can any one provide me the link for IS 9178 & IS 11592 to download. or through mail if possible.
Thanks in advance.

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