In this lecture, we will cover the following:

• How to extract nodal displacements and rotations from the OpenSeesPy model,
• We will repackage OpenSeesPy results into the UG vector format used by your existing code,
• We will reuse helper functions to identify maximum displacements and their locations,
• We will extract support reactions from the solved model,
• You will check vertical force equilibrium as an initial validation step.

We begin by translating the OpenSeesPy results into the same data structure used by our custom solver. This means collecting each node's displacement and rotation components and placing them into a global displacement vector called UG. The benefit of doing this is that our existing helper functions and plotting tools can be reused without needing a separate result-processing workflow for OpenSeesPy.

We then use the repackaged displacement data to identify the maximum displacement and its location. We also extract reaction forces from the OpenSeesPy model and check whether the vertical reactions balance the applied loading. This equilibrium check gives us an important sanity check before relying on the results for comparison or visualisation.

Next up

In the next lecture, we will use the repackaged displacement results to plot the OpenSeesPy deflected shape and compare its appearance with our custom solver.