I have a roof suspended structure to be modeled in STAAD. The structure has long span and heavy, so the analysis shows lateral reactions due to the constraint. I am intend to provide slot in the mounting bracket to relief that lateral restraint load by allowing a minimal movement like 0.0X ". How can I model this? I know in AutoPipe I can define gap for such case. How to deal with this in STAAD? If I define lateral spring for the reaction points, it will also affect displacement for seismic and wind loading while I need the release only for the gravity load, lets say to weld or bolt after installation (after gravity load applied). This is very important issue for dealing with packaged structure or pre-fabricated structure.
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