Anchor Bolt Chairs Better | Aisi E 1 Volume Ii Part Vii

A very specific topic!

• Require non-shrink precision grout (minimum 5,000 psi) beneath the entire chair footprint.
• Specify grout thickness ≤ 1 inch; for thicker, use a grout pad with embedded plate.
• Use leveling nuts on anchor bolts to adjust chair before grouting.

Anchor Bolt Chairs per AISI E-1 Vol. II, Part VII: Achieving Better Performance in Cold-Formed Steel Construction

1. Introduction

In cold-formed steel (CFS) construction, anchor bolt chairs are critical but often overlooked components. They transfer tensile and shear loads from CFS columns or posts to concrete foundations via anchor bolts. AISI E-1 (North American Standard for Cold-Formed Steel Framing – General Provisions), Volume II, Part VII, provides specific prescriptive and performance-based requirements for these chairs. aisi e 1 volume ii part vii anchor bolt chairs better

After the failure, the retrofit used AISI E 1 Volume II Part VII chairs with formed 12-gauge legs, back-to-back channels, and full-penetration welds. The same uplift load was re-applied (via test) with zero movement. That is the definition of "better." A very specific topic

1. Design requirements: The standard provides requirements for the design of anchor bolt chairs, including the calculation of the required strength and stiffness.
2. Material specifications: The standard specifies the materials that can be used for anchor bolt chairs, including steel plates, brackets, and anchor bolts.
3. Testing requirements: The standard outlines the testing requirements for anchor bolt chairs, including the test setup, loading protocol, and acceptance criteria.
4. Installation guidelines: The standard provides guidelines for the installation of anchor bolt chairs, including the requirements for anchor bolt embedment, tightening, and spacing.