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Re: How Can Force in "All Thread" be Determi

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I had something similar happen to me.  It sure does give one a lot of faith 
in the theories and numbers, doesn't it? :) 

Ralph Hueston Kratz, S.E.
Richmond CA USA

In a message dated 10/10/01 9:03:24 AM, bcain(--nospam--at) writes:

<< As a side note, I was in the very early part of my career (about 5 years 

of school).  The carpenter foreman was quite skeptical that by jacking

horizontally one could make the truss lift.  He protested vigorously but did

what I asked. He kept muttering about "college boys."  When we stressed the

first truss, the load on the load cell hardly moved as we stressed the bars.

He kept saying, "This will never work. See, the bar load is getting higher

and higher and the vertical load hasn't changed at all (not quite true but

the change was a very small reduction."  We reached nearly the design load

on the bars (we had load cells on them too) when all of a sudden, the load

on the load cell under the center panel point went rapidly to zero and the

shore toppled. The foreman stood there silently for several minutes with his

mouth wide open.  Finally he said, "well, I'll be damned. The college boy

does know what he's doing."  From that point on, I had his complete



Bill Cain, SE

Oakland CA


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