Section 3 Boundary conditions
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for the Polar Class Vessel and Criteria for Non-Linear Analysis, January 2022 - Chapter 2 Non-Linear Analysis - Section 3 Boundary conditions

Section 3 Boundary conditions

Parent topic: Chapter 2 Non-Linear Analysis

3.1 Boundary conditions

3.1.1 It is recommended that boundary conditions are to be applied such that the structure beyond the grillage section is accurately represented. All structure that continues beyond the modelled region must be represented by restraining the translational degrees of freedom in the plane of the structure. For example, hull plating at the vertical boundaries must restrain the vertical translational degree of freedom and at longitudinal boundary conditions the longitudinal translational degree of freedom must be restrained. In addition, deck and grillage stiffening structure must be similarly restrained. The simply supported boundary conditions are to be applied to the model at the ends supported by the transverse bulkheads and at the centreline, as shown in Ch 2, 3.1 Boundary conditions 3.1.1 and Ch 2, 3.1 Boundary conditions 3.1.2.

Table 2.3.1 Boundary conditions

Location Translation Rotation
Aft End and Fore End
Cross-section (local and full breadth FE model) Fixed - Fixed - Fixed Fixed
CL Elevation
Centreline (local FE model) - Fixed Fixed Fixed - Fixed

3.1.2 If there are difficult to define the boundary conditions in the FE model, the fixed boundary condition can be applied at the end of the FE model, as shown in Ch 2, 3.1 Boundary conditions 3.1.1 and Ch 2, 3.1 Boundary conditions 3.1.2.

Figure 2.3.1 Boundary conditions for local FE model

Figure 2.3.2 Boundary conditions for full breadth of FE model
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