TUB 2765 SHS Welded Joints - Tata Steel

15 Design of SHS welded joints
Bracing effective width failures, figure 15, are generally associated with RHS chord gap joints which
have large ß ratios and thin chords. It is also the predominant failure mode for RHS chord joints with
overlapping RHS bracings.
Mode Description
Bracing
effective width
Figure 15 : Bracing effective width
Localised buckling of the chord or bracings, figure 16, is due to the non-uniform stress distribution
at the joint, and will not occur if the validity ranges given in section 5 are met.
Mode Description
Chord or bracing
localised buckling
Figure 16 : Localised buckling of the chord or bracings
4.3 Joints with a single bracing
The statements given in table 3 will only be true provided that the joint capacity does not exceed the
capacity of the members. In all cases the capacity is defined as a load along the axis of the bracing.
Chord width to
thickness ratio
Bracing to chord
width ratio
Bracing angle
Bracing to chord
strength factor
Joint parameter Parameter value Effect on capacity
b o /t o or d o / t o
d 1 /d 0 or b 1 / b 0
Note : (1) - provided that RHS chord side wall buckling does not become critical, when ß > 0.85
Table 3 : Effect of parameter changes on the capacity of T-, Y- and X-joints
θ
f y1 t 1
f y0 t 0
reduced increased
increased increased
(1)
reduced increased
reduced increased