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- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Topping out a steel structure with a tree and What About th
- From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
- Date: Thu, 2 Sep 99 17:52:00 -0500
> The welding metal used in L.A.?s 1,500 >steel-frame buildings is brittle and prone to failure under seismic pressure. I read the article in the LA Weekly, and it seemed completely bereft of any suggestions about action to be taken. I appreciate the problem, which has been with us for over 50 years, but the notion that someone can replace all the welds in 1500+ framed structures is nuts. It'd make about as much sense to condemn everything, drop each building with explosives and start over. I doubt that a significant percentage of the affected welds are even accessible. There's a good chance that repairs to even the accessible welds pose a great risk of fire. Without having seen any real engineering evaluation of the welds themselves, I doubt that brittle welds would be blamed on Lincoln Electric were there a handier deep pocket within subpoena range. Brittle welds usually result from improper weld procedures, slipshod QA and casual engineering specification of consumables, procedures and joint details. And I daresay that the notion of 'prequalified joints' requiring no qualified procedures or welders is back there somewhere. Christopher Wright P.E. |"They couldn't hit an elephant from chrisw(--nospam--at)skypoint.com | this distance" (last words of Gen. ___________________________| John Sedgwick, Spotsylvania 1864) http://www.skypoint.com/~chrisw
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