A grade S275 steel 610 × 229 × 101 UB is to be connected, via a welded end plate onto a 356 × 368 × 177 UC. The connection is to be designed to transmit a bending moment of 500 kN m and a shear force of 300 kN. Show that the proposed welding scheme for this connection is adequate.
Leg length of weld, s = 10 mm. Effective length of weld is
Weld second moment of area, Ixx, is
Weld shear (moment) is
where y = D/2 = 587/2 = 293.5 mm
Vectored force = sqrt(1.492 + 0.162) = 1.50 kN/mm
Since the steel grade is S275 and the electrode strength is 42, the design strength of the weld is 220 N/mm2.
Weld capacity of 10 mm fillet weld, pwc, is
where throat thickness of weld, a = 0.7s = 0.7 × 10 mm
Hence proposed welding scheme is just adequate.