Design of Fillet Welds According to EN 1993-1-8
Figure 01 - Throat Thickness a of Fillet Weld (a) and Deep Penetration Fillet Weld (b)
Figure 02 - Weld Stresses on Throat Section of Fillet Weld
Figure 03 - Beam
Figure 04 - Table 1.6 Welds
Figure 05 - Table 5.1 Welds
Technical Article
A fillet weld is the most common weld type in steel building construction. According to EN 1993‑1‑8, 4.3.2.1 (1) [1], fillet welds may be used for connecting structural parts where the fusion faces form an angle between 60° and 120°.
The effective throat thickness a of a fillet is generally assumed to be the height of the triangular axis (isosceles or not isosceles) that is measured up to the theoretical root point, see Figure 01.
[1] , the ultimate limit state of fillet welds is usually determined by the directional method or the simplified method. The direction-related method is shown below.
The applied stress is assumed to be distributed uniformly over the seam cross-section and leads to the following normal and shear stresses as shown in Figure 02:
- σ ⊥ normal stress perpendicular to the weld axis
- σ || Normal stress parallel to the weld axis
- τ ⊥ Shear stress (in the plane of the fillet weld area) perpendicular to the weld axis
- τ || Shear stress (in the plane of the fillet weld area) parallel to the weld axis
[2] .
Material: S235, f u = 36.0 kN / cm², β w = 0.8
Internal forces: V z = 350 kN
Keywords
Fillet weld Weld Weld stress Weld seam design Deformation check
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