I define a hollow rectangular section,

the width = 300mm, the height = 400mm, thickness of flanges = 20mm, thickness of webs = 14mm.

The shear area of the section along local (horizontal) Y axis are

Sofistik (AY): 8.705E-03 m^2

Sap2000: 0.012 m^2

manual calculation: 2 * 0.3 * 0.02=0.012 m^2

The shear area of the section along local (vertical) Z axis are

Sofistik (AZ): 9.779E-03 m^2

Sap2000: 0.0112 m^2

manual calculation: 2 * 0.4 * 0.014=0.0112 m^2

The manual calculations are the same as those in Sap2000, but they are different from those in Sofistik.

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