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Special Moment Frame – Nailer to Steel Beam Connection Design

Strong Frame Special Moment Frame

Moment Frame Design Requirements and Assumptions

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 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 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 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 1b and 1c) to make up the 3.5" difference between the top of the column cap plate and the top of the steel beam.

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 2). Coordinate shear transfer to frame with Simpson Strong-Tie for any special requirements.

SMF Nailer to Steel Beam Connection Design, Figure 1(a) - Standard 4x Wood Nailer on Top of Steel Beam

(a) Standard 4x Wood Nailer on Top of Steel Beam

SMF Nailer to Steel Beam Connection Design, Figure 1(a2) - Strong Frame Diagram
SMF Nailer to Steel Beam Connection Design, Figure 1(b) - Cold-Formed Steel Stud

Section A-A Beam Top Connection
(b) Cold-Formed Steel Stud

SMF Nailer to Steel Beam Connection Design, Figure 1(a2) - Strong Frame Diagram

Section B-B Bearing Connection at Link Region
(c) Steel Bent Plate or Channel

Figure 1 — Shear Transfer Connection Options at Top of Steel Beam

SMF Nailer to Steel Beam Connection Design, Figure 2(a) - Shear Transfer to Column from Shear Plate

(a) Shear Transfer to Column from Shear Plate

SMF Nailer to Steel Beam Connection Design, Figure 2(b) - Shear Transfer to Column from Welded Bucket

(b) Shear Transfer to Column from Welded Bucket

Figure 2 — Shear Transfer to Moment Frame Through the Column