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A partial cross-section of a general cross-section may be defined as a thin-walled section or as a solid section (thick-walled) section. If the final general cross-section consists of one type of sections only, there is nothing to bother about. If all the partial sections are thin-walled, the final cross-section is thin-walled as well. If all the partial sections are solid, the final cross-section is solid as well.
But what happens if thin-walled parts are combined with solid ones? In SCIA Engineer, the final cross-section is considered as solid section.
What’s more important to know is the fact that even an opening is considered to be a "solid" section, so if a thin-walled section is cut with an opening, the result is a solid cross-section.
Note: It is important to remember this rule as it determines which formulas are used to calculate sectional characteristics.