Design of Fillet Welds According to EN 1993-1-8
A fillet weld is the most common weld type in steel building construction. According to EN 1993‑1‑8, 220.127.116.11 (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.
 , 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
Material: S235, f u = 36.0 kN / cm², β w = 0.8
Internal forces: V z = 350 kN
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