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Torsionally-loaded Lotte tower
3D ground structure (lattice) topology optimization
Domain is a thin-shell supported at the base and loaded by a moment at the top. The cross-section of the domain varies linearly between a square at the bottom and a circle at the top. Based on a competition done by SOM. Disclamer: Despite the relative agreement between this solution and the competition design, both solutions were obtained by different methods and objectives.
"GRAND3 — Ground structure based topology optimization for arbitrary 3D domains using MATLAB." T. Zegard and G. H. Paulino. Journal of Structural and Multidisciplinary Optimization 52(6), 2015.