DISTRIBUTION OF EXTERNAL FORCES ACTING ON THE PILES OF A GRAVITY TYPE BREAKWATER REINFORCED WITH STEEL PIPE PILES.

Abstract

 For the purpose of constructing a tenacious breakwater, a structure in which steel pipe piles are driven in rows into the ground on the inner side of a gravity breakwater and filled with soil between the caisson and the steel pipe piles has been proposed. The most important thing for this structure is that the piles remain sound even if the caisson is severely deformed. To achieve this, it is necessary to be able to estimate the magnitude and location of the bending moment generated in the piles appropriately. In this study, external forces acting on the piles from outside the harbor were investigated, and their estimation and simplification were attempted. The adequacy of the estimated external force distribution was evaluated by comparing the calculated bending moments and deflections with the experimental values obtained from model horizontal loading experiment. As a result, the external force distribution outside the port was replaced by a triangular shape, and the bending moment generated in the pile was expressed concisely by setting the apex position of the triangular shape as the fill height, the ground surface position, and the first zero depth of deflection of the pile, l_y1.