Without a chair, the eccentricity of an anchor bolt relative to the shell would cause severe localized bending. The chair acts as a bridge, transferring the bolt's tension into the shell through vertical side plates and welds. Secondary Bending:
: If calculated stresses are too high, using a larger number of smaller-diameter bolts can distribute the total load more evenly around the shell's circumference. 2. Advanced Stress Mitigation Aisi E 1, Volume Ii, Part Vii Anchor Bolt Chairsl aisi e 1 volume ii part vii anchor bolt chairs better
Oversized or slotted holes are used to allow column placement after concrete pour, but excessive slot length reduces bearing area and introduces bending in the bolt. Without a chair, the eccentricity of an anchor
Welds between the chair and the shell must resist both vertical shear and horizontal thrust caused by eccentricity. 1/4-inch fillet welds are typically standard but must be verified for larger loads. Material and Structural Considerations Materials: 1/4-inch fillet welds are typically standard but must
This article dissects AISI E 1-16 (or latest edition) Volume II, Part VII, explaining its requirements for cold-formed steel framing connections and, more importantly, how adhering to this part of the AISI specification elevates anchor bolt chair design from a mere spacer to a critical load path component.
Structural steel such as ASTM A36 or ASTM A572 Grade 50 is standard.