I think the "bottom laterally supported" means that the bottom edge of the vertical angle leg is laterally supported by the horizontal angle leg -- not that the entire angle is laterally supported. I'm not familiar with this article could you let me know specifically in what journal...
I just had the same situation and determined that you can't do this in Mathcad. If you try to input a range of variables in the excel sheet, mathcad inputs them into excel as an array furthermore, you can't insert a component in a Mathcad program loop. I ended up using the scenario function of...