Have asked STAAD as to how or what Cm values are used when calculating BETA1 factors used in code checking to AISC LRFD (For API LRFD code check, cm values can be input manually as for the 9th edition code check), - As yet no response from STAAD (3 weeks now). I assunme that cm values are automatically calculated when the DAM method is used to calculate member forces but not sure if cm values are claculated when only a first order anlaysis is used in calculating member forces. Any comments much appreciated.
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