Risposta:
In RFEM, nella libreria delle sezioni trasversali sono disponibili le sezioni composte denominate Travi nervate. They allow you to place openings in the web of sections such as W-shapes for example. The layout of the openings is parametric where the diameter and spacing can be adjusted. These cross-sections can further be designed in the RF-STEEL AISC add-on module.
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You can then set separate cross-sections for the start and end of the member allowing you to create a tapered section.
