The following notations and requirements from AISI E-1 are vital for a "better" or more robust design: Width along the shell, typically 4 to 12 inches. Chair Height (
In the world of cold-formed steel (CFS) connection design, the anchorage of a light-gauge stud to a concrete foundation is often the weakest link. Misalignment, concrete blowout, and rotational flexibility have long plagued standard embedded anchor bolts.
AISI E1 Volume II, Part VII Compliance: The Role of Better Chairs aisi e 1 volume ii part vii anchor bolt chairs better
The “chair” elevates the CFS member slightly above the concrete to prevent moisture wicking and accommodate bolt tolerances.
When engineers state that the AISE 1 Volume II Part VII anchor bolt chairs are "better," they are referring to three distinct advantages over ad-hoc or light-duty designs: The following notations and requirements from AISI E-1
This is the flat horizontal plate the anchor bolt passes through. The manual helps you calculate the required thickness so the plate does not bend when the bolt is torqued.
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Try to match the thickness of the chair plates with the thickness of the tank shell courses or other widely used plates on the project. This reduces material sourcing costs and minimizes scrap.
Making a chair excessively tall increases the bending moment exerted on the tank shell. Keep the chair just tall enough to allow proper tool clearance for bolt tensioning or torquing.