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RE: Las Vegas Sign Structure[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Las Vegas Sign Structure
- From: <William.Sherman(--nospam--at)CH2M.com>
- Date: Tue, 4 Mar 2008 07:53:55 -0700
I attended a talk by Finley Charney about this sign back in 1998. My notes indicate that a Principal Engineer sealed the drawings but two young engineers with Masters Degrees and with relatively little experience performed the detailed design. A Peer Review had also been done - but the forensic review team found numerous errors in the design and detailing.
Another suggested contributor was the fact that the sign was designed for Exposure Class B (questionable for some quadrants) and a one-third increase was taken for wind. These served to reduce the safety margin against wind, estimated around 60 mph that day.
CH2M HILL / DEN
From: Jnapd(--nospam--at)aol.com [mailto:Jnapd(--nospam--at)aol.com]
Sent: Monday, March 03, 2008 3:44 PM
Subject: Re: Sign Structures
Las Vegas area use to have a different philosophy as to awarding contracts and who is responsible.
If I remember correctly it was 365' tall and 30' tall x 180-220' long message area at 275' up the sign.
I worked for a company that got the contract from the insurance carrier for the contractor of the sign. I will say The structural engineer was told to accept half of his asking fee for the project or he would not get the project.
His EIT engineer did all the computer input and design. Nodal offsets of 12-18" were not reconized and or ignored. It failed where our computer model failed. The iron workers hated to work on it because of the 10-15' of typical movement on any given day. I think it was designed for 30-40' of deflection at top.
The city allowed a wind exposure of B old UBC, Las Vegas changed their code requirements after the failure.
In a message dated 3/3/2008 8:16:46 AM Pacific Standard Time, spraguehope(--nospam--at)hotmail.com writes:
Johnson & Nielsen Associates
Palm Springs, CA
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