Thanks for the insights about long span deflections. Revisiting the AISC Design Guide I notice that the absolute deflection limit of 3/8" to 1" falls under the heading "Design Considerations Relative to Interior Partitions and Ceilings." Partitions are not a concern here...
I am working on the preliminary design of a fabricated steel girder truss (Pratt) for a roof application. The truss depth is limited to 9' by architectural constraints (unless I can show that it will not work). I have modeled the truss geometry in STAAD to size the members and to determine...
