Structural shape optimization of deep-water bridge pile groups

Abstract

This study analyzes the wave-induced response of piles and pile caps. After examining the influence of pile length, three optimized foundations were proposed with the aim of reducing the free length of piles, and corresponding finite element models were established to compare their wave-induced responses. The results show that the displacement at the pile cap increases with pile length until the cap emerges above the water surface, while the internal forces at the pile base also increase accordingly. Introducing an intermediate connection along the pile can reduce its free length and improve the wave-induced response of the foundation, except for shear forces. A stiffer connection demonstrated better effectiveness in enhancing the stability of the foundation. These findings provide a useful reference for optimizing pile foundations of deep-water bridges.