Fibre Rope Cross Section

This cross section is used to model fibre rope parts of the slender system. The fibre rope stiffness model uses the input historical maximum tension \(T_{max}\), the highest mean tension the cross section has been subjected to, to establish the initial elongation and axial stiffness of the section. The cross section has only axial stiffness.

The fibre rope model is described in SIMO Fibre Rope Model.

Fibre rope segments have an initial elongation given by the input historic highest mean tension (Tmax). This gives an initial stress-free length that is larger than the modelled distance between the end nodes.

The initial elongation is applied in the same way as user-defined stress-free segment lengths, i. e. gradually during a static load group. If Initially pre-stressed segments is specified, the fibre rope elongation will be applied in this load group together with any stress-free segment lengths specified by the user. Otherwise, the elongation will be automatically applied in the first load group.

The mean static tension of each fibre rope segment is used to calculate the dynamic stiffness and update the stress-free element lengths at the beginning of linear and nonlinear time domain analysis.

The hydrodynamic load modelss

are available for Fibre rope cross sections. For details, please see Hydrodynamic load models.

For details of the input file please see Fibre rope - input reference.