Type of connection: Pipe – Shear lag connection in bracing
Unit system: Metric
Designed acc. to: AISC 360-10
Investigated: Shear lag of pipe, welds
Materials: Steel A36, Weld E70XX
Geometry:
Length of embedded part of pipe tp = 85 mm
Weld leg size: 5 mm
Applied forces:
N = 200 kN (in tension and compression per pipe)
AISC 360-10 and Steel construction manual – results
IDEA StatiCa Connection – results
Analysis: 84.8 %
Plates: 3.7 % < 5.0 %
Welds: 83.5 % < 100 %
The analysis stopped at 84.8 % when the plastic limit strain was reached. The resulting resistance is 170 kN. The results shown below are at the load resistance – 170 kN.
Comparison:
Shear Lag: Check of the plastic strain in IDEA StatiCa clearly shows the shear lag effect. The capacity is exhausted at 170 kN when the limit plastic strain of 5 %is reached. The computation acc. part D of AISC 360 shows that the connection is beyond the limit by 19%, and predicts the rupture at 168 kN. Both results are very close to each other with a difference of 1 %.
Weld: Weld checks are passing according to both methods with sufficient reserve.