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Concrete Anchor Design

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Case
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Concrete Anchor Design Models
In the past, Williams has recommended the use of ACI 349 appendix B which utilized a "45˚ cone method" for designing concrete anchor bolt systems. A new model is presently available in ACI 318 appendix D, however the database used to generate this new model was primarily derived from test data that included anchors up to 1" in diameter. For larger diameter anchors 1" and greater, the method shown in ACI 318 appendix D does not have a time tested record to demonstrate the effectiveness of its current equations. Some adjustment factors to the concrete breakout equation would need to be applied for anchors larger than 1" diameter in the future as the anchor test database increases to accommodate deep embedded anchors. The model presented in ACI 318 appendix D when used for large diameter anchors (diameters between 1" and 2" ) would typically be more conservative than the "45˚ cone method", but it may also be restrictive. Williams recommends designers use the models they are most comfortable with for deep embedded anchors and consult Williams Concrete Anchor Division for test data that may be useful.

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 is done 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 anchor products. Some tests described in codes, such as ACI 318 Appendix D and ACI 355.2, are cost prohibitive for large diameter anchors. These tests were primarily written for small diameter anchors and recent findings have shown the economic impracticality for large anchor systems. The space, concrete mass, equipment and experience are often not available for some of the testing required by ACI 355.2 as it currently pertains to large diameter anchors. ACI has recently organized a task group to study the economic problems related to testing large anchors in concrete. Please contact the Concrete Anchor Division at Williams Form for guidance on deep embedded anchor systems.

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Concrete
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Case
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