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Re: Steel Member Check for Seismic Loading

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On May 3, 2007, at 9:17 AM, Paul Blomberg wrote:

It looks like the engineer was evaluating the loads at a 45 degree angle and did SRSS (square root of the sum of the squares) to sum the forces and stresses. This seems like a reasonable approach when both orthogonal forces don't occur at the same time.
That's what I thought at first, but you wouldn't base the stress calculation on Fbx alone in that case--you'd use {fa/Fa + root[(fbx/ Fbx)^2+(fby/Fby^2)]} < 1.0

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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