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Stiffener dimensions

The stiffener thickness th is designed according to the resistance of the joint. The design resistance of the stiffener is equal to the design resistance of the weld Fw (See also chapter: "Calculated from connection resistance")

with:

Fw the design resistance of the weld taken as smaller of: α*FRd and Nt.Rd.
bf the beam flange width taken as the smaller flange width in case of un-symmetric beam
fy the yield strength of the stiffener
γM0 the partial safety factor
th the thickness of the stiffener

The final thickness of the stiffener is multiplied by the ratio of fy,beam/fy,stiffener to assure that the stiffener will be strong enough to transverse the force from the beam.

In case conditions for aplying the additional resistance the the "Column web in shear" component (for further info see "Column web panel in shear" chapter) are fulfilled, the calculated stiffener thickness is taken equal to the thickness of the bottom flange of the beam.

For calculation of weld sizes of stiffeners perpendicular to the column/beam flange, the same method described "Minimum for full strength" in chaper Calculation of flange weld size, is used. The calculation is based on the Ref. [35] - ECCS N° 126. The final formula is derived as:

with

fy the yield strength of the weaker part
fu the ultimate tensile strength of the weaker part
βW the correlation factor
γM0 the partial safety factor for material
γM2 the partial safety factor for welds
t the thickness of the stiffener

Each stiffener thickess and weld size is calculated separately, based on the used material.

Thickness of the web doubler is always taken as the inputted thickness of that component. Weld size of a web doubler with relation to the article EN 1993-1-8, Art 6.2.6.3 (8), is based on the type of the web doubler:

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