BIFURC is an NGI general purpose finite element program for geomechanical analysis.
Distribution of excess pore pressure
Features
- Plane strain, axisymmetric, fully 3-dimensional and quasi 3-dimensional (3D-effect taken into account by shear stresses at the sides of the 2-dimensional model).
- Elasto-plastic material model for undrained behaviour of clay with stress path dependent (anisotropic) non-linear stress-strain relationship including peak and residual strengths (strain hardening/softening)
- Elasto-plastic material model for sand with shear strain dependent mobilised friction and dilatancy (strain hardening/softening). Non-linear elastic bulk stiffness which can be different during first loading, unloading and reloading.
- Cyclic material model where the secant shear modulus depends on the normalised maximum shear stress and equivalent number of cycles
- Formulation for calculation of accumulated pore pressure and strains due to cyclic loading
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Displacement field
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Coupled static equilibrium and pore water flow.
- Advanced solution algorithms for non-linear problems
- 2 and 3-dimensional curved interface elements with non-linear undrained and drained stress-relative displacement relationship
- Beam and curved shell and membrane elements for modelling of structure.
- Interaction with the general purpose pre- and post-processor FEMGEN/FEMVIEW
Applications
- Capacity (failure) analyses of gravity platforms, foundations, suction anchors and submarine slopes
- Displacement analyses of gravity platforms, foundations and suction anchors including effects of cyclic loading and pore pressure dissipation
- Soil-structure interaction analyses
Results
- Load-displacement curves of selected points (e.g. load capacity)
- Displacement, stress and pore pressure histories of selected points
- Stress/strain paths of selected points
- Spatial distributions of displacements, pore pressure, stresses and strains
- Deformed mesh or displacement vectors (e.g. failure modes)
- Principal stress and strain vectors