TUB 2765 SHS Welded Joints - Tata Steel

33 Design of SHS welded joints
Chord shear area, A v
The chord shear area, Av , in K- and N-joints with a gap is dependant upon the type of bracings and
the size of the gap
A v = A 0 - (2 - ) b f t f + (t w + 2r) t f
1 0.5
with = 4 g2 for RHS bracings
1 +
3 t 2
f
and = 0 for CHS bracings
5.4.3 I - or H - section chords and RHS bracings with axial loads
T-, Y- and X-joints
Chord web yielding, N 1 = f y0 t w b w / sin (θ i )
Bracing effective width, N 1 = 2 f y1 t 1 b eff
K- and N-gap joints
Chord web yielding, N i = f y0 t w b w / sin (θ i )
Chord shear, N i =
f y0 A v
√3 sin (θ i )
The bracing effective width failure criterion, below, does not need to be checked provided that :
g / t f ≤ 20 - 28 ß : ß ≤ 1.0 - 0.015 b f /t f : 0.75 ≤ d 1 / d 2 or b 1 / b 2 ≤ 1.33
Bracing effective width, N i = 2 f yi t i b eff
The chord axial load resistance in the gap between the bracings (N 0gap ) should also be checked if the
factored shear load in the gap (V App ) is greater than 0.5 times the shear capacity (V p ).
N 0gap = f y0 [A 0 - A v (2V App /V p - 1) 2 ]
K- and N-overlap joints
Only the overlapping member i need be checked. The efficiency of the overlapped member j should be
taken as equal to that of the overlapping member.
i.e. Ni = Ni (Aj fyj )/(Ai fyi )
25% ≤ Ov < 50%
Bracing effective width, Ni = fyi ti [(Ov / 50) (hi - 2 ti ) + beff + beov ]
50% ≤ Ov < 80%
Bracing effective width, Ni = fyi ti [hi - 2 ti + beff + beov ]
Ov ≥ 80%
Bracing effective width, Ni = fyi ti [2 hi - 4 ti + bi + beov ]