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An investigation after the shear resistance of prestressed concrete foundation piles without shear reinforcement. Current design codes are based on the Critical Shear Crack Theory (CSCT), which assumes that the critical shear crack develops at a specific location In the pile-head. However, when eccentric loading introduces additional bending moments, the position of this critical shear zone shifts toward regions where the prestressing force has not yet fully developed. This occurs because the prestressing tendons require a transmission length before their force is completely transferred into the concrete. As a result, the actual shear capacity in these zones may differ from the predictions of existing calculation models, highlighting the need for refined understanding and improved design guidance.