ABSTRACT:

The aim of the present study is to investigate the wave induced pressures and forces exerted on inclined circular cylinders due to the action of random waves. The test cylinder is of 20 cm diameter consisting of different individual segments, in which one of the segment was mounted with pressure transducers around its circumference. The tests were carried out in a wave basin with random waves described by three different standard spectra. The sectional force time history is obtained by integrating the pressure time histories. Both spectral and statistical approaches have been applied to investigate the effect of inclination of the cylinder on the wave forces. The salient results of the present study are reported in this paper.

INTRODUCTION

Owing to the great increase in the exploitation of offshore oil and mineral reserves, a variety of structures are being built in the marine environment, most of which are supported on piles. Cylindrical tubular members frequently form an integral component of offshore structures such as bridges, piers, drilling and production platforms, floating breakwaters, articulated mooring towers, etc. Due to the wide application of cylindrical members in marine, environment, loads exerted on such structures by ocean waves has been a topic of active research for the last few decades. The methodology originally proposed for a vertical circular cylinder resting on the sea bed and piercing the sea surface by Morison et al. (1950), though, widely used for the calculation of wave forces on tubular members, uncertainty, still prevails in assigning the values for the hydrodynamic coefficients of drag, CD and inertia, CM. Several investigators have presented the variation of the hydrodynamic coefficients as a function of non-dimensional parameters, namely Keulegan-Carpentar number, KC and Reynolds number, Re which indicated a wide scatter in their relationships.

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