The following example shows how to estimate the rotational stiffness of a trapezoidal sheeting connected to the top flange of a purlin (C_D,A) as per EN1993-1-3.

Note: Position of sheeting positive / negative

b_T: Width of the sheeting flange through which it is fastened to the purlin (in mm)

b_T,max: See Table 10.3

In Advanced Design, the rotational stiffness from sheeting to purlin can be considered when the Advanced Stability feature is enabled:

The C_D,A rotational stiffness can then be specified in the bedding tab, as the K_Rx component:

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