# FAQ 004949 EN

## How is the rotational stiffness of a buckling stiffener determined in PLATE‑BUCKLING?

In PLATE‑BUCKLING, the rotational stiffness of a stiffener is determined on the basis of the sketch shown in the figure including formulas according to ECCS Design of Plated Structures, Fig. 2.77.

Rotational Stiffness of Stiffener with Same Distances to Next Stiffener

$$cθ=E·t33·b$$

 cθ Rotational stiffness of the buckling stiffness E Modulus of elasticity t Component thickness in the buckling panel b Distance to the next stiffener

Rotational Stiffness of Stiffener with Different Distances to Next Stiffener

$$cθ=E·t3·b1+b24·b1·b2$$

 cθ Rotational stiffness of the buckling stiffness E Modulus of elasticity t Component thickness in the buckling panel b1 Distance to the next stiffener on one side b2 Distance to the next stiffener to the other side

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• Updated 5 April 2021

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