ABSTRACT
The screw piles, made by twisting a strip of flat steel, are excellent for ease of driving and demonstrate high resistance to vertical loads. However, screw piles have a horizontal resistance is lower than that of steel pipe piles of the same diameter. In this study, the horizontal resistance of screw coupled piles, which are expected to improve, was tested by model tests in the sand tank. Based on the model test results, a static nonlinear analysis is carried out to rationalize the structural design. The analytical model was that the ground is a bilinear soil reaction spring and the pile is a beam model on the soil reaction spring. It was found out that this analysis allowed to reproduce the initial rigidity and the maximum load of the screw coupled piles structure, and an example of the optimization of the structure of vertical and battered piles was identified.
