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03.B - Multiple Beams Bear on Girders on Notched Column

Multiple Beams Bear on Girders on Notched Column

Wood column cross-section is reduced to provide bearing for wood girders. Wood beams bear over wood girders. Positive connection between the beams, girders and column is screws or bolts.

Purpose: Transfer of vertical load from beams and girders to column.

Design Notes

  • Girders may be simple-span or continuous over column.
  • Fully-threaded screws reinforce beam notch as necessary.
  • Capacity is limited by girder perpendicular-to-grain bearing.
  • It is recommended that screws installed in beam are slightly overdriven to account for beam shrinkage.
  • NDS allows notching glulams with limitations outlined in section 5.4.5 while considering requirements for shear capacity in 2018 NDS 3.4.3.2 (or 2024 NDS 3.4.3.1) and 5.3.10. Bending capacity at notches should consider the net section per NDS 3.1.2. Refer to AITC Technical Note 19 and APA S560 for more guidance.
  • Notches in wood elements including glulam may be strengthened by fully-threaded screws reinforcing the potential crack location. One design method of screw reinforcement is provided in MTC Solutions’ Timber Reinforcement Guide.
  • Deck not shown for clarity. Beam may require bracing for lateral-torsional buckling.
Class
Class 1
Load
Load High
Cost
Cost $$
Const.
Constructability Advanced
Fire
Fire Rating II

Related Mass Timber

Multiple Beams Bear on Girders on Notched Column

Wood column cross-section is reduced to provide bearing for wood girders. Wood beams bear over wood girders. Positive connection between the beams, girders and column is screws or bolts.
03.B - Multiple Beams Bear on Girders on Notched Column