Non-Linear Analysis

The non-linear behaviour of structural systems can be analysed using the standard FS2000 Core Module solver or the optional non-linear solvers, FS-3D Non-Linear & FS-DyNoFlex. The range of elements and solution options enable the user to model and undertake static solutions or dynamic simulations of an extremly wide range of structural systems in both marine and non-marine environments.

CORE MODULE SOLVER

Analysis Features

• P-Delta Analysis (2nd order analysis)
• Tension/Compression Only Elements
• Contact/Interference

The loading to this module is applied in a single step. Load case combinations can be pre-combined. This simplifies its use since the only non-linear control parameters required are maximum number of iterations and a convergence criteria ratio.

FS-3DNonLinear & FS-DyNoFlex

The are the two main non-linear solvers in FS2000. FS-3DNonLinear is a static solver version of FS-DyNoFlex without the large displacement capabiliy. .

Features

• Dynamic (Implicit time history - Newmark or Wilson Theta)
• Large Displacement
• Frame Plasticity - Ideal plastic behaviour - Axial/Moment Interaction (Linear/BS5950 etc)
• Plasticity - Defined by stress/strain curve
• Tension/Compression Only Elements
• Gap Elements (Contact/Friction)
• Damping elements
• Pipe/Soil Interaction elements - Buried and surface
• Interaces with FS-Wave - Response from Regular or Irregular Seastates (JONSWAP etc)
• Vessel elements (motion by RAO definition)
• Non-Linear Soil/Pile Interaction - Interfaces with FS-Pile for 3-D Pile analsysis
• Variable loading using time curves
• Standard result case can be formed at any time step - design checks