This model of a steel tower with stairway structure was used in videos about efficient modeling and design of structures.
The Dlubal website "Structural Analysis Models to Download" (https://www.dlubal.com/en-US/downloads-and-information/examples-and-tutorials/models-to-download) offers many other example files that help you to get started and become familiar with the Dlubal programs. The filter options help you to find the appropriate model.
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