Abstract
A theoretical model is developed to support the well known empirical relationship between capacity and torque for helical foundations and anchors. The model is based on energy exerted during installation and that required to displace the helical foundation or anchor once in place. Through the equivalence of energy, the model relates bearing and pullout capacity directly to installation torque. Downward force during installation, helical blade geometry, multiple helices, blade pitch per revolution, and hub radius are taken into account. The model is applied to determine the capacity and installation torque for several helical foundations and anchors of different geometric configurations. Theoretical predictions are shown to correlate with previously published field and laboratory measurements.
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