A pile foundation with reinforced bars has been proposed by Matsuo and Ueno and is put practical use for increasing uplift bearing capacity of transmission tower and others. For investigating the mechanism of such type of reinforced foundations under not only uplift loading but also push-in loading, two- dimensional model tests and the corresponding numerical analyses were performed. Model tests and numerical simulations are done with different stiffness of reinforcements and different insertion direction of reinforcements. It is shown through the experimental and numerical study on uplift bearing capacity that though the flexible reinforcements works as the tensile reinforcements, and the stiff reinforcements as the bending reinforcements, the reinforcements protruded diagonally downward is the most effective for both cases. On the other hand, the experimental and analytical results show that the foundation with flexible reinforcements is not so effective against push-in loading, though the stiff reinforcements protruded diagonally downward work most efficiently.
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