THE EFFECTS OF SURFACE CHARACTERISTICS OF WAVE IMPACT LOADS ON CYLINDRICAL STRUCTURES


Beity A. M. A. A. , Korkmaz F. C. , Güzel B.

7. ULUSLARARASI 19 MAYIS YENİLİKÇİ BİLİMSEL YAKLAŞIMLAR KONGRESİ, 19 May 2022, pp.1-4

  • Publication Type: Conference Paper / Full Text
  • Page Numbers: pp.1-4

Abstract

On offshore platforms, especially cylindrical legs are always tremendously put through assorted wave impact forces. The pressure measurement of the wave loads and the structural deformations that occur on the cylinders were figured out for the platform's life span. In this study, the wave forces acting on the cylindrical structures are investigated experimentally. Concurrently, the pressure distributions and deformations that happened in the modified cylinder surface characteristics were decided by applying a hydrophobic coating.

Hydrophobic surface coating resulted in the increased water drop angle to the surface, hence the adhesion of the water on the surface has reduced. The geometric change or added weight coated on the surfaces of the cylinders is not remarkable. Both hydrophobic and hydrophilic surface cylinders were subjected to wave loads with different wave amplitudes and frequencies repeatedly. The wave's pressure distributions and surface deformations of the cylinders were measured by three pressure sensors installed on the focal points of the cylinders and a strain gauge installed inside the cylinders, respectively. Each pressure measurement variation was analysed and interpreted in detail when the surface characteristics of cylinders changed.

For the hydrophobic surfaces, the pressure response of the cylinder changed depending on the position of the pressure sensor by decreasing the maximum pressure or the impact time. The structural deformations because of the cylinders surface characteristics that changed for the hydrophobic surface were compared with the strain values. In addition, the distribution of the impacting wave on the surface varied, and the structural deformation also changed. This observation is supported by image processing, and it reveals the difference in the water body size to which the surface is exposed.