Aisi E 1 Volume Ii Part Vii Anchor Bolt Chairs Better Fix May 2026

): Calculated by treating the plate as a beam with partially fixed ends.

An optional plate used for stability or to increase the bearing area on the foundation. Why the AISI E-1 Method is Superior

): Must be tall enough to distribute the load without overstressing the shell. Typical heights range from 6 to 33 inches depending on the bolt size and shell thickness. Top Plate Thickness ( aisi e 1 volume ii part vii anchor bolt chairs better

While anchor chairs are excellent for discrete bolt locations, they should not be placed further than 10 feet apart. If the required bolt spacing is less than 2 feet 6 inches, the suggests a continuous top ring may be more efficient than individual chairs.

Supports the nut and washer, transmitting the bolt tension into the vertical plates. ): Calculated by treating the plate as a

Welds between the vertical plates and the shell must be checked for combined vertical and horizontal loads. A 1/4-inch fillet weld is often sufficient, but larger bolts require detailed verification. Comparison: Chairs vs. Continuous Rings

For high-seismic applications where tanks have thin shells, anchor bolt chairs designed to AISI E-1 specifications are the preferred choice for ensuring long-term structural integrity and maintenance accessibility. Typical heights range from 6 to 33 inches

The formulas are applicable to various structures, including flat-bottom tanks (API 650), conical shells, and tubular columns. Critical Design Considerations

Engineers using this manual must calculate several key dimensions to ensure the chair is "better" than a generic attachment: Chair Height (

Using the offers several advantages over simple gussets or direct bolting: