This definition uses Octopus to find the optimal height and width of a concrete shell bridge based on the deflection, weight and height. The octopus component contains some sample iterations. To view in the TRIAL version, set the Mesh Resolution to 6 and the Edge Refinement Factor to 1.
Get the grasshopper definition here: Rhino5 – 03_Optimization_ShellBridge_RH5.gh | Rhino6 – 03_Optimization_ShellBridge_RH6.gh
This example uses Karamba3D 1.3.2 and Octopus for multi-objective optimization.