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Component Manufacturing dverti$ dverti $ er
By Simpson Strong-Tie Staff
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Don’t Forget! You Saw it in the
April 2023 #15285 Page #108
Adverti$$er
How to Accommodate Misplaced Shearwall Anchorage
or several years, the Simpson Strong-Tie Strong-Wall® research and development team has kicked around the idea of developing an “adapter” that would allow for field substitutions or accommodate misplaced Strong-Wall anchorage.
The Strong-Wall WSWH high-strength wood shearwall uses 1”-diameter anchor bolts, and our SSW Steel Strong-Wall® installs with either ¾”- or 1”-diameter anchor bolts — depending on the model. Additionally, Simpson Strong-Tie Strong-Wall shearwalls also feature different on-center spacings for the anchor bolts across some like-width models. This makes an “easy substitution” nearly impossible. Aside from jobsite conversions, the other area where the adapter provides value is in cases where the anchor bolts haven’t been correctly placed in the field and the concrete has already been poured. This is often the case when an anchor bolt template is not used. Historically, our only option has involved costly concrete demolition and trying again with a template or drilling through thick concrete members and pouring new foundations below the existing. Simpson Strong-Tie Engineering Supervisors Caleb Knudson and Rachel Holland spearheaded the solution to this challenge by working together with our engineering team to develop an adapter. Below is a step-by-step description of how the adapter works. Step 1 — The solution consists of two Welding the adaptor on the jobsite 1¼”-thick by 3½”-square steel plates with tapped holes that thread onto the anchor bolts that are already set in concrete. The fact that these plates are square allows them to be tightened in quarter-turn increments so that they are both tight to the concrete and the plate edges are in the same plane as the 2×4 framed wall. They may also accommodate any anchor bolt spacing associated witha different manufacturer’s wall or Simpson Strong-Tie StrongWall shearwalls. The existing anchor bolts are then trimmed flush with the top of the steel plates. Step 2 — A spacer plate is placed between the two square steel plates. This 1¼”-thick spacer plate is pulling double-duty by providing additional concrete bearing capacity for the entire assembly and stiffening up the continuous plate above it (which is detailed in Step 3). Continued next page
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