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**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?