Interactions between steep waves and a vertical surface-piercing cylinder as well as two cylinders in tandem arrangement with different spacings are investigated experimentally in this study. The focus of this study is on nonlinear wave and wave-current loads on structures. It is further aimed at investigating the higher harmonic loads and secondary loading cycle. The influence of non-dimensional parameters Kc, kA and Fr on the wave forces exerted on the structures is examined. The effect of spacing between two columns on the wave and wave-current loads is analyzed in depth. It is found that wave steepness plays an important role in the development of nonlinear wave force. It is also pointed out that the spacing effect on the nonlinear loading is rather pronounced.

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