ABSTRACT

High loads resulting from extreme waves may challenge the structural integrity of offshore installations. Existing methods for slamming loads calculation mainly rely on basic wave characteristics, offering conservative estimates. The current study introduces an innovative method for calculating slamming loads on jacket structures by utilizing kinematics from advanced wave simulation. This approach enables the calculation of dynamic loads arising from extreme waves with complex morphologies on jacket structures of varying configurations. The method is demonstrated on a finite element model of a jacket structure proving an efficient solution for the calculation of slamming loads with low computational noise.

INTRODUCTION

Changes in weather patterns, which may be attributable to climate change, have prompted an expected surge in the prevalence of extreme weather conditions in offshore environments (Meucci et al., 2020; Morim et al., 2021). Previous estimates of the extreme weather event expectancy may no longer be accurate. As a result, concerns are raised for the integrity of already-installed offshore structures, designed based specifications that include outdated expectations of extreme weather events (Cruz & Krausmann, 2013; Dong et al., 2022).

The most significant environmental loads on offshore structures during extreme weather conditions are arguably the forces induced by incident high-amplitude breaking waves. Typical design methods for calculating these substantial loads often rely on notable assumptions, resulting in conservative estimates (Tu, Cheng, et al., 2017). However, assessing the integrity of existing structures under unforeseen conditions, which may push them perilously close or beyond their stress limits, necessitates a more precise approach for the calculation of breaking wave loads. In this regard, forces exerted by breaking waves are impulsive, non-linear, and exhibit a complex temporal and spatial profile. A quasi-static approach is, therefore, not adequate for breaking wave loads as it does not take into account the evolving nature of the wave's impact (Amin et al., 2009). Therefore, more detailed models for calculating wave loads are necessary to model the dynamic performance of offshore structures induced by extreme breaking waves.

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