Aisi E 1- Volume Ii- Part Vii Anchor Bolt Chairs Link

: Must be sufficient to distribute the load without overstressing the shell. : Generally 6 inches; however, if the bottom plate is inch, a minimum of 12 inches is required. : Usually recommended not to exceed (top plate width) or approximately 33 inches. Top Plate Width (

Disclaimer: This article is for informational purposes and does not replace professional engineering judgment. Always consult the latest version of AISI standards and a licensed structural engineer for your specific project. aisi e 1- volume ii- part vii anchor bolt chairs

At first glance, an anchor bolt chair seems trivial—a bent plate of steel with a hole. But in CFS construction, the stakes are high: : Must be sufficient to distribute the load

manual provides the "laws of physics" for these chairs to ensure they never fail: Top Plate Width ( Disclaimer: This article is

This is the most cold-formed-specific check. The chair angles are bolted or welded to the column’s thin web. Under uplift, the chair pulls outward, placing the web in transverse tension. Part VII requires checking the web for net-section rupture at the bolt holes (if bolted) or gross-section yielding at the weld toe. The standard explicitly accounts for shear lag effects when the load is transferred only through a portion of the web, a phenomenon dominant in thin-gauge members.

While not a structural part of the chair, references the use of leveling nuts. Two nuts and a washer must be installed first on the anchor bolt, then the chair, then a top washer and nut. The leveling nuts allow the installer to achieve the precise elevation required to make the CFS frame plumb.

: Must be sufficient to distribute the load without overstressing the shell. : Generally 6 inches; however, if the bottom plate is inch, a minimum of 12 inches is required. : Usually recommended not to exceed (top plate width) or approximately 33 inches. Top Plate Width (

Disclaimer: This article is for informational purposes and does not replace professional engineering judgment. Always consult the latest version of AISI standards and a licensed structural engineer for your specific project.

At first glance, an anchor bolt chair seems trivial—a bent plate of steel with a hole. But in CFS construction, the stakes are high:

manual provides the "laws of physics" for these chairs to ensure they never fail:

This is the most cold-formed-specific check. The chair angles are bolted or welded to the column’s thin web. Under uplift, the chair pulls outward, placing the web in transverse tension. Part VII requires checking the web for net-section rupture at the bolt holes (if bolted) or gross-section yielding at the weld toe. The standard explicitly accounts for shear lag effects when the load is transferred only through a portion of the web, a phenomenon dominant in thin-gauge members.

While not a structural part of the chair, references the use of leveling nuts. Two nuts and a washer must be installed first on the anchor bolt, then the chair, then a top washer and nut. The leveling nuts allow the installer to achieve the precise elevation required to make the CFS frame plumb.