Gusset connections – Column-beam-brace

References

Packer, Jeffery A., Donald Sherman, and Maura Lecce. Design Guide 24: Hollow Structural Section Connections. Chicago, IL: American Institute of Steel Construction, 2010. pp 55-65.

Details

From the reference:

Example 5.1. End Tee Connection

Determine the applied load, Pr, the connection can withstand in tension and compression for the end connection shown in Figure 5-9. Use four bolts, 1 in. diameter, ASTM A490-N, in standard holes and 70-ksi filler metal. The build-up tee stem is attached to an identical plate that is welded to the support structure.

From AISC Manual Tables 2-3 and 2-4, the material properties are as follows:

HSS 8X6X5_16

ASTM A500 Grade B

  • Fy = 46 ksi.
  • Fu = 58 ksi.

Plates

ASTM A36

  • Fy = 36 ksi.
  • Fu = 58 ksi.

From AISC Manual Table 1-11, the HSS geometric properties area as follows:

HSS 8X6X5_16

  • A = 7.59 in2.
  • B = 6.00 in.
  • H = 8.00 in.
  • t = 0.291 in.

Cap plate: tp = 1.00 in.

Stem and support plates: ts = 0.75 in.

Refer to the figure in the reference for additional details.

Results

Table 1.
Parameter RAM Connection Reference Difference
Available strength of the welds connecting the stem to the tee flange (Interface between Gusset – Top right brace – Tab side – Tee flange weld capacity) - Vr (kips) 128.77 125 Difference due rounding and tab width.
Local yielding of the HSS wall (Interface between Gusset – Top right brace – Brace – Side wall local yielding) – Vr (kips) 314.23 349 Difference due to factor variation.
Shear yielding through the cap-plate thickness (Interface between Gusset – Top right brace – Brace – Tee flange shear yielding) – Vr (kips) 399.60 389 Difference due to small plate length calculation.
Shear rupture through the cap-plate thickness (Interface between Gusset – Top right brace – End tee connection – Tee flange shear rupture) – Vr (kips) 482.85 470 Difference due to small plate length calculation.
Available strength of the welds connecting the tee flange to the HSS (Interface between Gusset – Top right brace – Tab side – Tee flange weld capacity) - Vr (kips) 194.90 195 Difference due rounding.