Gusset connections – Column-beam-brace

References

Ericksen, Jason, et. al HSS Design Manual, Volume 4:Truss & Bracing Connections. Glenview, IL: Steel Tube Institute, 2017. pp 4-2.145 – 4-2.153.

Details

From the reference:

Example 4-2.4. HSS Diagonal to Gusset plate end Tee connection example

Given:

Welds: E70XX

Brace HSS 6X6X3_8

  • Hbr = 6 in.
  • Bbr = 6 in.
  • Tbr = 0.349 in.

Cap plate

  • tpc = 1 in.
  • Bpc = 7 in.
  • Lpc = 7 in.

Stem plate

  • tps = ¾ in.
  • Bps = 7 in.
  • Lps = 8 ½ in.

Gusset plate: tgp = ¾ in.

Connection Forces: Brace axial force Pu_br = ± 75 kip (tension/compression)

This example will only include the design of the brace to gusset plate and tee connection. See Example 4-2.2 for the gusset plate to beam and gusset plate to column connections.

Refer to the figure in the reference for additional details.

Results

Table 1.
Parameter RAM Connection Reference Difference
Strength of the weld connecting the stem to the Tee flange (Interface between Gusset – Top right brace – Directly bolted – Tab side –Stem to tee flange weld capacity) - Vr (kips) 100.93 97 Difference due rounding.
Strength of the HSS Wall in Local Yielding (Interface between Gusset – Top right brace – Directly bolted – Brace – HSS wall local yielding) – Vr (kips) 341.10 200 Difference due to bearing length calculation.
Shear yielding of the tee flange (Interface between Gusset – Top right brace – Directly bolted – Tab side – Tee flange shear yielding) – Vr (kips) 313.20 302 Difference due to tee flange width variation.
Shear rupture of the tee flange (Interface between Gusset – Top right brace – Directly bolted – Tab side – Tee flange shear rupture) – Vr (kips) 378.45 365 Difference due to tee flange width variation.
Strength based on bolting to the splice plate – Bolt shear (Interface between Gusset – Top right brace – Tab side – Bolts shear) - Tr (kips) 97.36 97.2 Difference due rounding.
Strength based on bolting to the splice plate – Tensile yielding of the stem and gusset plate (Interface between Gusset – Top right brace – Checks for gusset and brace – Tension yielding on the Whitmore section) - Tr (kips) 157.08 156 Difference due rounding.
Tensile yielding of the splice and gusset plate (Interface between Gusset – Top right brace – Tab side – Tab tensile yielding) - Tr 141.75 130 Difference due rounding.
Block shear of the stem and gusset plate (Interface between Gusset – Top right brace – Tab side – Block shear on gusset) - Tr (kips) 192.78 210 Difference due to the small plate length differences.