[Top] [All Lists]

Re: [TowerTalk] KSYZ Tower Collapse

To: "Michael Hatzakis Jr MD" <>,"'Ethan'" <>, <>
Subject: Re: [TowerTalk] KSYZ Tower Collapse
From: Jim Lux <>
Date: Sun, 07 Jan 2007 11:50:53 -0800
List-post: <>
At 11:19 AM 1/7/2007, Michael Hatzakis Jr MD wrote:
>What surprises me is that one guy wire failure could bring down the whole
>tower... isn't there usually some degree of redundancy built into these
>tower systems?

Maybe it took out not just one wire, but the whole anchor?

And, the guy system is designed for expected wind loads, not 
something big suddenly yanking hard on a guy and pulling it in a 
different direction than expected.  It's one thing to have a guy 
wire  fail or get over tensioned in the normal direction.  Another to 
have something remove the normal force holding the tower up and apply 
a force in a different direction.

Could be all sorts of things that went wrong. Usually, with a 
collapse of some sort, it's a combination of two things (often 
unrelated) that result in the event.

In the engineering failure analysis biz, they're called "systems 
failures"... all the parts worked pretty much as planned, but the 
combination didn't, or there was some unforeseen interaction.  It's 
an area of some study.. the things like material failure and simple 
design problems are pretty well understood, and can be 
prevented.  It's the complex interactions that are less amenable to 
analysis and prevention.  Generally, the phrase that springs to mind 
after one of these "events" is "Who'd have known?".



TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>