Abstract
The pile group foundation of sea-crossing bridges has various structural forms, and its wave force characteristics are complex. In this study, the Morrison equation and the boundary element method were utilized to establish a calculation model for predicting the maximum wave forces on the pile group foundation with a square pile cap. Moreover, hydrodynamic models of pile group foundations were designed according to the gravity similarity criterion. On this basis, the model test and analytical calculation were carried out to investigate the effect of pile spacings, pile slopes, conical slopes (on the top of the pile cap), and wave parameters on wave forces of pile group foundations. In addition, impact characteristics of waves on the foundation were also analyzed. The results shown that larger pile spacings and pile slopes reduced the wave forces on the foundation, but this relationship weakened with the rise of the water level. The inclined pile could be regarded as a vertical pile for calculating wave forces at high water level. The conical slope increased the water-blocking area on the pile cap, which led to the increase of wave forces on the foundation. When the wave only acted on the pile group, the wave forces on the single pile firstly decreased then increased with the increase of frequencies, and lower wave frequencies (larger periods) induced stronger nonlinear factors of the waves. When the water level was near the bottom of the pile cap, larger wave periods increased the vertical wave forces on the pile cap. The wave impact mainly occurred in the time range from the pile cap first contacting with the wave to the wave crest reaching the middle of the pile group foundation.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call