>I have seen many stress files where sif is ignored for sustained & occ
>(siesmic) cases.
If sif means the stress concentration factor, then it is ignored for
seismic and constant loading because peak stresses are only objectionable
as a source of fatigue failure. Seismic loading is cyclic but with only a
few cycles of high loading and sustained loading is non-cyclic.
Ordinary garden variety Code work(excluding Div 2 and nuclear construction) does not require fatigue analysis because the combination of lower allowable stress and prescribed details provide a sufficient margin against fatigue.
Christopher Wright P.E. |"They couldn't hit an elephant at chrisw@skypoint.com | this distance" (last words of Gen. ___________________________| John Sedgwick, Spotsylvania 1864)http://www.skypoint.com/~chrisw Received on Fri Sep 27 23:18:00 2002
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