The document summarizes the results of optimizing member sizes for a structural model through multiple iterations. It shows graphs of the unity check values and structure weight decreasing with each iteration. The overall conclusion is that the initial member sizes selected were conservative, minimal changes occurred after the second iteration, and the final optimized model had 20% of its weight from primary structure and 36% of the total module weight from structure. The runtime for each iteration was 3 minutes for SACS and 2 minutes for the macro.

1. STEP 3: MEMBER UC OPTIMIZATION
Note” “UC” is unity-check as
per API/AISC
Model at Start of Analyses
MCHTM Inc
Model after 4 Iterations
Weight of modelled structure = 4945 kN
Weight of modelled structure = 3294 kN
0.00
0.50
1.00
1.50
2.00
2.50
3.00
OO 8A 8B 8C
UnityCheck(UC)
Iterations
Modelled Members Min, Max & Avg UC at each
Iteration
Avg UC
Min UC
Max UC
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
OO 8A 8B 8C
ModelledStructureWeight(kN)
Iterations
Modelled Structure Weight at each Iteration
OVERALL CONCLUSION:
1. Initial selection of member size
for this module was very
conservative..
2. Minimal change in the results
after the 2nd iteration.
3. Final results
a. Ratio of Primary structure
weight to total module
weight: 20%
b. Ratio of Total structure
weight to total module
weight: 36%
4. Run Times for each iteration
a. SACS – 3 min
b. Macro – 2 min