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On Nov 13, 2008, at 11:30 AM, SGE Structural wrote:

Struggling through the 2007 AASHTO BDS, I fail to understand one very basic thing. There was a good thing invented once, called stress, why the new codes use forces instead?
It's the result of emphasis on limit load analysis. Lots of discussion on this over the years, some of it mine, since limit load analysis doesn't have much applicability for the types of equipment I do. Mechanical systems are much more concerned with performance under service loading.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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