Steel section selection of the entire structure may be optimized. The optimization method utilizes a state-of-the -art numerical technique which requires automatic multiple analysis.

You may start without a specifically designated section. However, the section profile type (BEAM, COLUMN, CHANNEL, ANGLE) must be specified using the ASSIGN command (see TR.20.5 Assign Profile Specification). The optimization is based on member stiffness contributions and corresponding force distributions. An optimum member size is determined through successive analysis/design iterations. This method requires substantial computer time and hence should be used with caution.

Refer to TR.49.2 Member Selection by Optimization for additional details.