Optimization

The beam design optimization is controlled by the order of the beam sizes in the design tables.

It is assumed that the sizes are ordered in the optimum (generally, least weight) order. Unless the selected size is overridden, the program will then select the optimum member. In the case of the RAMAISC.BMS table provided with the program, if the design is not controlled by unbraced length or a depth restriction, members selected will correspond to the beams in bold type face in "Allowable Stress Design Selection Table ‑ S_x" for ASD, in "Load Factor Design Selection Table ‑ Z_x" for LRFD, or in "Flexural Design Tables Selection by Zx" for AISC 360 (ASD and LRFD) with the following exceptions:

W18x35 and W16x31 will be selected in lieu of W14x34 and W14x30, respectively, unless limited by user‑specified depth restrictions or by unbraced length considerations.
M shapes are not included in the optimization table.
W10x12 and W8x10 are included in the optimization table.

When beams of equal weight but different depth are both adequate, the deeper beam will be selected unless limited by user‑specified depth restrictions or by unbraced length considerations.

When no beams are adequate for the loads and conditions specified, the output will indicate "No Design". This indicates that special consideration is required for this member. The Takeoff output does not include any weight for such members.