Two parallel or tapered plates that transfer the load from the top plate to the shell.
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. aisi e 1 volume ii part vii anchor bolt chairs better
Engineers using this manual must calculate several key dimensions to ensure the chair is "better" than a generic attachment: Chair Height ( Two parallel or tapered plates that transfer the
The formulas are applicable to various structures, including flat-bottom tanks (API 650), conical shells, and tubular columns. Critical Design Considerations A 1/4-inch fillet weld is often sufficient, but
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.
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