This paper presents a new and efficient numerical approach to model embedded mooring lines in three-dimensional space based on a finite element framework. The chain-soil interaction is described as elastic perfectly-plastic springs connected to chain links that are modelled as beam elements. Each individual beam element is connected to the adjacent two elements with a type of connector element that allows relative free rotation but no separation to mimic the interaction between chain links. The numerical approach is validated by comparing with the existing and widely accepted analytical method for two-dimensional chains. A three-dimensional calculation example is presented by using the approach to investigate the geometry, tension and soil resistance distribution of a mooring line under cyclic loading.
Yinghui Tian, Wenlong Liu and Mark J. Cassidy
Keywords: mooring line, numerical approach, three-dimensional, anchoring system
Publisher: DFI