For a combined cross-section in SHAPE‑THIN, the shear area Ay is larger than the total cross-sectional area A. Why?


The unusual values of shear areas, that is, greater than A, may occur for parametric thin-walled sections, for example, that have an atypical geometry and may not be ideally thin-walled.

The shear areas are calculated according to the theory of thin-walled cross-sections in SHAPE‑THIN. Therefore, the defined cross-section should have reasonable dimensions with regard to the width-thickness ratios. The thickness t* of the connecting null element can be used to affect the shear transfer and thus the value of a shear area.


Combined cross-section Shear area Null element t*


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Cross-Sections Thin-Walled

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