Bolted Flange-Plated FR Moment Connection (Beam to Column Flange)

References

American Institute of Steel Construction. 2011. Design Examples V14.1. Chicago, IL:American Institute of Steel Construction. p IIB-22

Details

From the reference:

Design a bolted flange-plated FR moment connection between an ASTM A992 W18×50 beam and an ASTM A992 W14× 99 column flange to transfer the following vertical shear forces and strong-axis moments:
  • VD = 7.0 kips and MD = 42 kip·ft
  • VL = 21 kips and ML = 126 kip·ft
Use 7/8-in.-diameter ASTM A325-N or F1852-N bolts in standard holes and 70-ksi electrodes. The flange plates are ASTM A36 material. Check the column for stiffening requirements.

Refer to the figure in the reference for additional details.

Calculations

Calculations

Vu = 1.2(7) + 1.6(21) = 42 kips
Mu = 1.2(42) + 1.6(126) = 252 kip·ft

Results

Table 1. Comparison with AISC Design Example II.B-1
Parameter RAM Connection Reference Difference
Flange plate tensile strength (kips) 170.1 170 < 1%
Flange plate tensile rupture (kips) 163.1 164 < 1%
Flange plate block shear rupture (kips) 320.4 320 < 1%
Flange local bending of column (kips) 171.1 171 < 1%
Web local yielding of column (kips) 185.9 186 < 1%

Input

The following data is input into the New Joint dialog:

Joint Data tab:
  • Joint = BCF
  • Beam/Section = W 18x50
  • Beam/Material = ASTM A992 Gr50
  • Column/Section = W14x99
  • Column/Material = ASTM A992 Gr50
Loads tab:
  • V2 (beam) = 42 kips
  • M33 (beam) = 252 kip·ft

Select the Smart Connections/Smart FP Bolted connection type.

The following data is input into the Connection Pad:

Flange Plate group:
  • Top plate thickness, tp = 0.75 in.
  • Bottom plate thickness, tpb = 0.75 in.
Flange Plate / Beam Side group:
  • Bolts = 7/8"⌀ A325N
  • Number of bolt rows = 4
  • Gage (transverse center-to-center spacing), g = 4 in.
  • Vertical edge distance, Lev = 1.5 in.
  • Horizontal edge distance, Leh = 1.5 in.
  • Longitudinal distance to beam edge (top plate), ef = 2 in.
  • Longitudinal distance to beam edge (bottom plate), efb = 2 in.
Flange Plate / Support Side group:
  • Weld size to support (1/16s in), D2 = 6