1. Use the alignment chart to determine the effective length factors for Columns AB and BC of the unbraced frame. Assume that the beams are 12-in. x 18-in. and the columns are 12-in. x 12-in. Use the ACI code for calculating the moment of inertia (Columns will have 70% and beams will have 35% of the moment of inertia for gross cross sections). Use = 10 for the hinged base. Use the alignment chart provided. B 30' 30' 30' 12' 12'

Fig: 1