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Helical piles are steel foundation structures composed of one or more helical bearing plates soldered to a central shaft. They can be installed quickly and reused multiple times. The process causes minimal disturbance and loads can be applied immediately. Applications include foundations for residential and commercial buildings and anchoring for transmission towers and offshore structures. This research uses a criterion based on the accumulation of displacement to investigate how the stability of helical anchors is affected by the application of low frequency cyclic loadings. Multi-helix anchors were installed in a loose sedimentary sand. Two axial tensile load tests with cyclic loading were performed. Five loading steps were applied, each with 60 one-minute cycles and different mean loads and cyclic amplitudes. Moderate to fast displacement rates were observed during the cyclic steps. Increasing the mean load and the cyclic amplitude resulted in large accumulated displacements and higher rates of displacement accumulation. The loading parameters were plotted on a cyclic interaction diagram and classified according to their capacity to resist cycles in three groups: stable, meta-stable and unstable behavior. Steps with cyclic amplitude smaller than 10% of the static capacity exhibited stable responses and unstable behavior was observed for cyclic amplitude greater than 30% of the static capacity.
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