The Simpson Strong-Tie connection is prequalified for use in special moment frame (SMF) and intermediate moment frame (IMF) systems within the limits of these provisions.
Figure description:
Simpson Strong-Tie T-stub Yield-Link Connection
- Primary Components:
- Column: Vertical structural member.
- Beam: Horizontal structural member.
- Yield-Link: Connects beam flanges to column flange; includes a stem (with a reduced region and a flange.)
- Shear Plate: Connects beam web to column; features horizontal and vertical slots.
- Key Fasteners:
- Yield-Link to column flange bolts.
- Link to beam flange bolts.
- Buckling restraint plate bolts.
- Central bolt (on shear plate.)
- Specialized Features:
- Protected Zone: Includes top and bottom Yield-Link and shear plate regions.
- Buckling Restraint: Includes plates and spacers positioned at the top and bottom links.
- Reduced Region: Notched section in the Yield-Link stem designed to fuse/yield during seismic events.
- Views:
- Main Elevation: Detailed side view of the full assembly.
- Yield-Link Plan and Section View: Details the geometry of the specific link component.
(a) T-stub Yield-Link
Figure description:
This technical diagram illustrates an End-plate Yield-Link connection between a steel column and beam.
Key Components:
- Yield-Link Stem: Features a reduced region designed to yield during seismic events.
- End Plate: Connects the link assembly to the column flange via bolts.
- Shear Plate: Connects the beam web to the assembly; contains horizontal slots and a central bolt to allow movement.
- Buckling Restraint Plates: Located at the top and bottom to prevent the yield-links from buckling.
- Protected Zone: Designated region encompassing the yield-links and shear plate.
- Fasteners: Includes link-to-column flange bolts, link-to-beam flange bolts, and buckling restraint plate bolts.
Detailed Views:
- Section A-A: Shows the vertical arrangement of bolt holes on the end plate.
- Section B-B: Shows the plan profile of the yield-link stem, highlighting the narrowed yielding section and bolt hole pattern for beam attachment.
(b) End-plate Yield-Link
Fig. 12.1. Simpson Strong-Tie Strong Frame moment connection.
Exception: Simpson Strong-Tie connections with concrete structural slabs are only prequalified if the concrete slab is isolated in accordance with Section 2.3.4.