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Soil structure interaction in energy piles has not yet been understoodcomprehensively. One of the important underlying issues is the location of azero-displacement point, known as the null point. This study investigates howthe location of a combined null point in fully floating energy piles isaffected by relative magnitudes of thermal and mechanical loads. Analyticalsolutions are used to address four different loading scenarios includingcompressive and tensile loads, and heating and cooling. It was found that thelocation of the combined null point coincides with the location of the maximummagnitude of the axial stress induced by thermo-mechanical load. Furthermore,while a thermal null point is always present in fully floating energy piles,the combined null point is absent in the case of a small magnitude of thermalload as compared to the mechanical load. With increase in the relativemagnitude of thermal load as compared to the mechanical load the combined nullpoint emerges at different locations for different load combinations. In allcases it subsequently moves towards the mid-length of the pile with increase inthe relative magnitude of thermal load.

Effects of Axial Load on the Location of a Combined Null Point in Energy Piles