AS 4100 contains specific requirements regarding the analysis of the lateral frames. RAM Frame currently implements the First-Order Elastic Analysis method considering rigid and simple members according to Section 4 of the specification. All lateral (frame) members of the structure are considered in a full building analysis (no sub structuring) with spans taken as centre-to-centre of supports. Pattern loading is considered in the design of all "gravity steel" beam and columns in their design in RAM Steel, and for all concrete members in RAM Concrete, but is not currently considered for steel frame members in RAM Frame. Note that per AS 4100 Section 4.4.2.1changes in geometry and effective stiffness due to axial load on members is not considered in the analysis.