Four Bolt Unstiffened Extended End Plate 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 four-bolt unstiffened extended end-plate 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 kips and MD = 42 kip·ft
  • VL = 21 kips and ML = 126 kip·ft
Use ASTM A325-N snug-tight bolts in standard holes and 70-ksi electrodes. The plate is ASTM A36 material.

b. Use design procedure 2 (then end-plate and larger diameter bolts) from AISC Design Guide 16, Flush and Extended Multiple-Row Moment End-Plate Connections (Murray and Shoemaker, 2002).

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-4
Parameter RAM Connection Reference Difference
w' (in.) 2.69 2.69 none
a1 (in.) 2.38 2.34 1.7% (rounding of small numbers)
Fi' (kips) 30.41 30.4 < 1%
Qmax,i (kips) 6.09 6.10 < 1%
a0 (in.) 1.5 1.50 none
F0' 30.41 30.4 < 1%
Qmax,o (kips) 9.67 9.68 < 1%
ϕMn (kip·ft) 272.7 273 < 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 MEP Extended both ways (DG4/Seismic) connection type.

The following data is input into the Connection Pad:

Moment End Plate group:
  • Plate thickness, tp = 0.875 in.
  • Flush extension length = 0.1 in.
  • Top flange weld type = fillet
  • Bottom flange weld type = fillet
  • Bolts = 1"⌀ A325N
  • Gage (transverse center-to-center spacing), g = 4 in.
  • Vertical edge distance, Lev = 1.5 in.
  • Horizontal edge distance, Leh = 1.75 in.
  • Distance from first interior bolt centerline to the beam flange, pfi = 1.5 in.
  • Distance from the outer bolt centerline to the beam flange, pfo = 1.5 in.
  • Number of bolt rows = 1 (for bolt group bottom flange, per the reference)