Abstract

With the increasing hydrocarbon exploration and exploitation activities as well as ship transport in the arctic region. The ice-structure interaction has received increasing attention. In this paper, the Smoothed Particle Hydrodynamics (SPH) method is extended to simulate the ice-structure interaction and investigate the ice-induced loads and vibrations of cylindrical structure. The softening elastoplastic model integrating Drucker-Prager yield criterion is embedded into the SPH method to simulate the failure progress of ice. The cylindrical structure is conducted as the deformable material, which displacement response and ice loads during the interaction of ice and structure are investigated in this paper. In addition, a simple and effective boundary condition for modeling the interface between ice and structure has been implemented in the SPH framework to simulate the ice-structure interaction. The proposed SPH method is employed to simulate level ice interacting with a vertical narrow structure, and the numerical data is validated through comparing with experimental results.

INTRODUCTION

In Arctic ocean engineering, the vertical structure is a typical offshore structural form, such as the jacket platform. With the increasing engineering activities in cold region seas, the ice induced vibrations of these vertical structures occurred more frequently. During the dynamic interaction progress of the ice sheet and vertical offshore structure, some violent ice-induced loads and vibrations may threaten the normal engineering operations or even securities of structures. Therefore, there is a great need to understand the ice-induced loads and vibrations of cylindrical structure. As it should be helpful to investigate and predict the interactions between the level ice ad offshore structures, which require attention in the design of offshore structures for both fatigue and ultimate limits.

The interaction during level ice and vertical offshore structure is a complex process, which include the ice failure and vibrations of structure. Due to the complexity of the interaction, most of the existing research work are approximations based on empirical formulas (Palmer et al., 2010) and phenomenological models (Hendrikse and Metrikine, 2016; Ji and Oterkus, 2016). These theories and models have the limits of predicting the different interactions for different types of structures in varying ice conditions (Hendrikse et al., 2018). In addition, in the most of existing numerical models about the ice-vertical offshore structure interaction (Liu et al., 2014; Sharapov, D and Shkhinek, 2018), the structures are considered to be rigid and the structure vibration is not considered. Thus, it is very important to develop a reliable numerical model to simulate the ice failure and the ice-induced loads and vibrations of offshore structure during the ice-structure interaction, especially the current related numerical studies are not adequate.

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