Marine pile selection presents a range of options, including H-piles, circular pipes, and box piles. However, in marine applications, circular piles and box piles often emerge as the preferred choices due to two key factors highlighted by G. M. Cornfield (1968):
Superior Column Buckling Strength: Marine structures like jetties typically have piles extended well above the seabed, making them susceptible to column buckling under axial loads. Circular piles and box piles offer inherent advantages in resisting buckling compared to H-piles, making them more suitable for these applications.
High Energy Absorption Capacity: Marine structures like dolphins and fenders are subject to significant impact forces during berthing operations. Circular piles and box piles demonstrate a high energy absorption capacity, effectively dissipating these forces and protecting the structure from damage.
While both circular and box piles excel in marine environments, circular sections are more commonly used due to their wider range of available sizes. This versatility allows engineers to select the most appropriate section to meet the specific load and geometric requirements of the project. Additionally, the symmetrical shape of circular piles simplifies analysis and design compared to the more complex geometry of box piles.
In conclusion, the choice of pile type in marine construction is driven by the need for both structural integrity and energy absorption. While H-piles may be suitable for certain applications, circular and box piles are favored for their superior buckling resistance and energy absorption capabilities. The prevalence of circular sections in marine structures is further attributed to their wider range of available sizes and simplified design considerations.