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The welds of the column top plate are very small. How can this be justified?

Answer

From the formula apparatus of EC 3-1-8, it is clear that the limit tensile forces of the cross-section's end plate are introduced into the column flange and thus directly into the column web.
Therefore, the upper end plate is not fully stressed by these forces.
For purely structural reasons, the column top plate is available for the stiffening and the panel boundary and serves for the transmission of the proportional force flowing into the stiffener in case of a required diagonal stiffener.

Keywords

Weld Column head plate End plate of column Column flange Column web

Reference

[1]   Eurocode 3: Design of steel structures - Part 1-8: Design of joints; EN 1993‑1‑8:2005 + AC:2009

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