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Reinforced Concrete = This system type should be selected for the structures consisting of reinforced concrete columns and / or reinforced concrete shearwalls.
Steel = This system type should be selected for the structures consisting of steel columns, steel beams and steel braces.
Reinforced Concrete + Steel = Steel frames (steel column + steel beam) and this system type should be selected in structural systems where reinforced concrete shearwalls are used together.
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