Special Moment Frame – Nailer to Steel Beam Connection Design
Moment Frame Design Requirements and Assumptions
D6. Nailer to Steel Beam Connection Design
For the shear transfer from the structure to the frame, Simpson Strong-Tie typically provides a 4x wood nailer (for 1/2” thick Yield-Links) at the top of our steel beam. The 4x wood nailer is then connected to the steel moment frame beam top flange with A325 bolts (Figure D6.1a). Demand load for the nailer to beam top flange utilizes the amplified (Ωo) forces to make sure adequate strength is provided. For cold-formed steel projects, the 4x nailer can be replaced with light-gauge stud tracks (Figure D6.1b) at the request of the designer. For structural steel projects, the 4x nailer at the roof level can be replaced with a bent plate or a channel section (Figure D6.1b and D6.1c) to make up the 3.5” difference between the top of the column cap plate and the top of the steel beam. For other Yield-Link® thickness models, see wood nailer and beam top flange to top of Yield-Link flange height requirements on the frame elevation drawings on strongtie.com.
In addition to shear transfer through the beam top flange, shear can also be transferred to the frame from the columns. A typical detail would be from a shear plate connection or a hanger welded to the face of the columns (Figure D6.2 on p. 39). Coordinate shear transfer to frame with Simpson Strong-Tie for any special requirements.
(a) Standard 4x Wood Nailer on Top of Steel Beam
(b) Cold-Formed Steel Stud
(c) Steel Bent Plate or Channel
Figure D6.1 — Shear Transfer Connection Options at Top of Steel Beam
(a) Shear Transfer to Column from Shear Plate
(b) Shear Transfer to Column from Welded Bucket
Figure D6.2 — Shear Transfer to Moment Frame Through the Column