Local Structure Analysis of Skirt Pile Sleeve Based on SACS and ABAQUS

As an accessory part of the jacket platform, the skirt pile sleeve is mainly used to connect the jacket platform and the pile structure to support and improve the stability. However, in the overall analysis of the jacket platform, its local strength cannot be accurately analyzed and checked. Therefore, it is necessary to use the combination of SACS (offshore structure design analysis software) and ABAQUS (finite element engineering simulation analysis software) finite element method to analyze the skirt sleeve. Taking a jacket platform project in East China Sea as an example, based on the overall structural analysis results of SACS, the more dangerous working conditions are obtained, and the displacement, force and bending moment loads of key joints are extracted. The finite element model of the target skirt sleeve is established, and the local strength analysis and shear plate buckling analysis are carried out under three extreme load conditions. The results show that the local overall strength of the skirt sleeve basically meets the strength requirements after removing the stress concentration positions such as the connection between the lower diagonal brace and the main leg, the connection between the upper diagonal brace, the shear plate and the main leg. Under extreme conditions, the maximal calculation usage factor of the shear plate after buckling check meets the DNV (Det Norske Veritas) standard. The research results show that the analysis method can improve the accuracy of the local structural strength and the shear strength of the platform leg. It has important practical engineering significance for the design of the new platform leg and the adaptability check of the subsequent transformation of the production platform.