The planar 25-bar truss uses bars grouped by sector, but even here, there is a clear trend of sizing and shape results differing by approximately 20–30% in the range of 2–5 bar groups and sizing results differing by about 50–53% for sizing.
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Assessing the Influence of Cardinality Constraints on the Simultaneous Optimization of Truss Sizing, Shape, and Topology.
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