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Procedures

Procedure: To compute $T_r$ of a Tension Member

Connection Details

Bolted connections:

  • Minimum pitch (S16 22.3.1)
  • Minimum and maximum edge distances (S16 22.3.2 and 22.3.3); (HB page 6-172)
  • Minimum end distance (S16 22.3.4)
  • Other bolting details (S16 22.3.5.2, 22.3.5.3); (HB pages 6-162 thru 6-182)

Welded connections:

  • Minimum size (HB p.6-186)
  • Maximum size (HB p.6-186 to 6-187)

Components

  • Ensure $L/r$ ratio limit is met (S16 10.4.2.2)
  • Determine $F_y$, $F_u$ (HB Tables 6-3, 6-7.)
  • Determine relevant dimensions, gross area $A_g$ (HB Part 6 (Properties and Dimensions), direct calculation, S16 12.2)
  • Compute $T_r$ for gross area yielding (S16 13.2 a) i))

Components with bolted connections

  • Determine bolt hole allowance (S16 12.3.2, 22.3.5)
  • Determine net area, $A_n$ (minimum over all potential failure modes) (S16 12.1, 12.3)
  • Determine effective net area for shear lag, $A_{ne}$ (S16 12.3.3.1, 12.3.3.2, 12.3.4)
  • Compute $T_r$ for net section fracture (S16 13.2 a) iii))
  • Compute $T_r$ for block shear (minimum over all potential failure modes) (S16 13.2 a) ii), 13.11)

Components with welded connections

  • Determine effective net area for shear lag, $A_{ne}$ (S16 12.3.3.1, 12.3.3.3, 12.3.3.4, 12.3.4)
  • Compute $T_r$ for net section fracture (S16 13.2 a) iii))

Components with pin connections, (except eye-bars)

  • Ensure detail requirements are met (S16 12.4.2)
  • Compute $T_r$ for gross section yield (S16 13.2 b) i))
  • Determine effective net areas for tension, $A_{net}$, and shear, $A_{nes}$ (S16 12.4.1)
  • Compute $T_r$ for net section fracture (S16 13.2 b) ii) and S16 13.2 b) iii)).
  • Use the lesser of the $T_r$ values so computed.

Fasteners

Bolts in bearing-type connections:

  • Determine $F_u$ of bolt material (S16 13.12.1.2).
  • Determine if threads are intercepted by a shear plane (they often are assumed to be).
  • Determine shear resistance $V_r$ (S16 13.12.1.2 c)).
  • Determine bearing resistance $B_r$ (S16 13.12.1.2 a) or b)).

Bolts in Slip-critical connections:

  • In addition, compare slip resistance, $V_s$ (S16 13.12.2), to service loads.

Fillet welds in shear:

  • Determine electrode strength, $X_u$ (S16 Table 4).
  • Determine factored resistance, $V_r$ (S16 13.13.2.2).