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FW: FW: Dallas Cowboys Roof Collapse

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Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
Victoria, BC


From: Ralph Watts [mailto:rdwatts(--nospam--at)] 
Sent: Wednesday, May 06, 2009 9:47 AM
Subject: Re: FW: Dallas Cowboys Roof Collapse


While it certainly looks suspicious, I would caution jumping to conclusions.
Micro-bursts can be both extremely powerful and very localized.  I heard of
severe damage in a small town in Idaho from these types of winds and it was
like a miniature tornado had hit.  One building would be damaged and the
ones around it were just fine.  As I am not familiar with the codes in
Texas, they may not really address the situation.  The NBC does not address
tornados but they happen in Canada and if micro-bursts can happen in Idaho I
imagine there are parts of BC where they could occur.
There have also been some recent collapses in Calgary of inflated structures
under snow.

I appreciate engineers sharing some of these failures, as I personally
believe there are far more of them out there than most of us are willing to


Ralph Watts

At 06:28 AM 06/05/2009, Thor Tandy wrote:

Uh oh!   Looks like a standard "oh s..t" moment.
From: Stan Caldwell [ <mailto:stancaldwell(--nospam--at)>
Sent: Wednesday, May 06, 2009 6:00 AM
To: SEAINT Listserv
Subject: Dallas Cowboys Roof Collapse
This project was apparently designed in Canada ...
Stan R. Caldwell, P.E., SECB, F.ASCE
Richardson, Texas 

What I want to know is this: Doesn't anyone design for wind in Texas?
One little poof of wind, and an entire structure comes down?
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
 V (949) 248-8588 . F(949) 209-2509

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