ABSTRACT:

In this paper, the characteristics of motion for floating pier under action of incident waves in frequency domain are studied. Floating pier made from two pontoons that pontoons are modeled as a rigid body and connected to each other by flexible and rigid connectors. Threedimensional diffraction theory is used to predict the dynamic response of two modules in irregular waves and hydrodynamic behavior of the floating pier are investigated. The pier motions are mostly determined by the energy in short wind waves. This energy in irregular wind waves can be quantified by an incoming wave spectrum ζ S. Jonswap wave spectrum methods can be used to determine the occurring wave spectrum. Response motions, wave and connection forces between the modules are determined with spectral analysis. Influence of parameters such as the connector stiffness, dimension of the pontoon - length and beam - and the submerged depth on the pontoon on motion are also studied. Motion-amplitude transfer functions (RAO) of pontoon in marked point, connector forces for the wide range of wave frequency and heading angle are computed. Finally we have show that the response of the floating pier motions is significantly dependant on the properties connector stiffness, wave conditions, wave frequency and interactions between the pontoons.

INTRODUCTION

Floating piers have various advantages comparing to land based structures. They are minimally influenced by water level fluctuations due to tide and storm surge. These structures are not influenced by soil/seafloor condition, so they do not suffer from differential settlement and can easily be relocated. Recently, a large-volume floating concrete container pier (213m x 30.5m) has been installed in the Port of Valdez, Alaska. Floating piers should be stable and safe during handling, up and down loading of cargoes and the embarking and disembarking of passengers or vehicles.

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