Introduction Dear all, I'm working on an assignment to model a ship-to-shore crane for a FEM design course. Having modeled the crane, I now need to apply the load of the trolley (which is hoisting the container) on the boom (which in my case is a lattice structure made up of beam elements). The total load of the trolley will be applied on the boom in 4 points (1 for each corner of the trolley) the load on an arbitrary position is shown in the image. The question Instead of applying the load at every possible position (which are a lot), I want to find the worst load cases along the lattice structure and only calculate the stresses when the loads are in those positions. I however have a hard time determining where that might be. If the boom would be model as just a single beam, it would be a lot easier. However, thanks to the lattice structure I have a hard time imaging where to apply the loads. Perhaps someone can point me in the right direction?