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Re: earthquake in STAAD-III

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>When you use SRSS load combination of STAAD-III, all the compression  
>members are designed as tesile members in design mode.
Developers--you gotta love 'em :-(
It might be a while before they get this one right. You actually have two 
extremes to consider for seismic loading, positive and negative. Design 
has to cover the static loads plus the worst of the two seismic extremes. 
If you can extract seismic stress and combine it with gravity and live 
loading, maybe you can invoke the design module one the combined loads.

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