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Concrete Anchor Design

Concrete
Anchors
Case
Histories
Corrosion
Protection
Concrete Anchor Design Models
In the past, Williams recommended the use of ACI 349 appendix B which utilized a “45° Cone Method” for designing concrete anchor systems. ACI 318 now has concrete breakout design methodology that was developed from the Concrete Capacity Design (CCD) Method. This applies to anchor diameters not exceeding 2-inches, and tensile embedments not exceeding 25-inches in depth. The CCD Method is an adaption of the κ Method and is considered to be accurate, easy to apply and capable of extension into irregular geometries. The κ Method defines the breakout strength calculations and the prism angle is approximately 35-degrees. The CCD Method predicts the load capacity of a single anchor or group of anchors, using a basic equation for tension and shear for a single anchor in cracked concrete. These load capacities are multiplied by modification factors that account for the number of anchors, edge distance, spacing, eccentricity and absence of cracking. The size and embedment depth limitations are based on the current range of test data and Williams recommends that designers use models that they are most comfortable with for anchor diameters greater than 2-inches in diameter and embedments exceeding 25-inches.

Concrete Anchor Testing

Williams has performed anchor tests spanning many years. Williams current capabilities allows testing deep embedded anchors in most configurations. Most deep embedded anchor testing has been conducted at Williams facilities.

Williams has supplied deep embedded concrete anchors for over 50 years and has gathered a vast amount of on-site testing, in house testing, and job experience related to the performance of large diameter concrete anchor products. Concrete anchor testing per ACI 355.2 is cost prohibitive for anchors in excess of 2-inches in diameter, as the space, concrete mass, equipment and experience are often not available. Please contact your Williams representative for guidance on deep embedded anchor systems.

Williams Form Engineering Corp.
Concrete
Anchors
Case
Histories
Corrosion
Protection
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