How to fix a 60mm structural spoke to a flat bar — and to the ø610mm walnut-clad column

The helical stair has a series of 60mm steel spokes radiating from the central column out to the outer flat-bar stringer beneath each tread. Each spoke has two distinct connection problems at its ends. Below are the ten methods commonly used in architectural structural steel — toggle the base member to compare flat bar vs ø610 column geometry on every option. Drag to rotate, scroll to zoom.

x radial

y vertical

z tangential

→ flat bar mode

spoke ø60 base weld fastener

drag · scroll · pinch

OPT 01 Direct fillet weld fillet weld

Spoke

ø60 × wall t.b.c. · CHS · grade S355

Flat bar (outer stringer)

60 × 10 mm · grade S355

Column (central core)

ø610 × 10 mm · walnut clad

Standard

DBC 2021 · EN 1993-1-8