How can we make such a spiral staircase

In this way, you can create a ladder by choosing a closed section such as a pipe/box/square profile so that the main beam of the ladder can be checked against torsion in the design, and detailing it with a recessed connection at the bottom and top ends. After creating the main beam in a linear way by defining its starting and ending points, you can assign a horizontal radius of curvature value suitable for your project in the curvature section of the beam settings. Subsequently, all the steps can be formed with the polar multiplication command using the beams formed with a section of a steel design (for example, U, C or Z) in accordance with the geometry of the staircase, so that their midpoints coincide with the main beam. Normally in this type of stairs, the narrowest width of the section can be used as the step beam section to stay on the safe side, since the rungs are narrow in the inner radius and wide in the outer radius. Related loads are applied to these step beams as a linear load and analysis, steel design, deflection/displacement etc. You can make the necessary controls in ideStatik. For this type of staircase, it would be better not to include the railings in the analysis model.
 
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