In this lecture, we'll cover:

• Defining and inputting a larger statically indeterminate truss structure into the code
• Numbering nodes, degrees of freedom and identifying restrained degrees of freedom
• Entering nodal coordinates, member connectivity and applied loads in the notebook
• Interpreting results, including the identification of zero-force members
• Reflecting on possible improvements and extensions to the truss analysis code

In this lecture, we work through a final, slightly larger statically indeterminate truss example and focus on how to input it correctly into our existing analysis code. We define the nodal coordinates, number the degrees of freedom, and identify the restrained degrees of freedom at the pin supports. We then transfer this information into the notebook, carefully entering the node coordinates, member connectivity (with consistent node ordering), restrained degree indices and applied loads. This reinforces the full workflow from structural definition through to execution of the analysis.

After running the notebook, we interpret the output, including member forces, tension and compression identification, the deflected shape and quantitative results. For the first time, we observe a zero-force member, highlighting how the numerical results can reveal structural behaviour that may not be immediately obvious. We conclude by reflecting on how we might enhance the code, such as allowing different material and cross-sectional properties for individual members or automating data entry for symmetrical structures. This encourages us not only to use the code confidently, but also to think critically about how we can extend and refine it.

Next up:

In the final lecture, we reflect on the full course journey, discuss how to extend the tools we have built, and look ahead to applying the direct stiffness method to beams and frames.