Cross section optimization incorrect results

Hi Clemens,

I am currently working on a parametric truss bridge design for my Diploma and wanted to use cross section optimization to make my structure more efficient. The problem is that as a result I get profiles with a thickness of less than 5 cm on a truss bridge spanning more than 100 m. In reality they should be in the 150 to 300 mm range. At this point i do not know what I am doing wrong.