Are you working with aluminum? We recommend you the Aluminum Design add-on. It allows you to perform cross-section resistance design and stability analysis of aluminum member structures in the ultimate limit state. The input and result evaluation are completely integrated in the user interface of the frame & truss analysis software RSTAB.
If you are looking for models to practice on or as inspiration for your projects, you've come to the right place. We provide you with a vast number of structural analysis models to download, such as RFEM, RSTAB, RSECTION, or RWIND files.