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Designing Lateral Beams

Designing Lateral Beams

Designing Lateral Beams

(OP)
I've been modelling a steel frame building with moment connected beams acting as the lateral system.  When I run the program with the auto select list and run a steel design, I get the largest member in the auto select list assigned to the lateral beams.  I tried removing that member size from the list, and rerunning the analysis and design, only to get the next largest member.  Checking the strength and deflection ratios of the member, I am well below the limit for failure.  

Does anyone know why the program isn't designing the beams appropriately, is there something i need to check with the overwrites.  Any help would be greatly appreciated.

RE: Designing Lateral Beams

Hi there, I think when u use Autoselection in design the section that gets selected has something to do with the controls of drift/displacement of a jiont, and if no target drift specified it will select the section the gives smallest drift/displacement.

try this
 http://www.csiberkeley.com/faq_ETABS.html#sfdo4

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