PLAXIS 2D Dynamics

Reliable and comprehensive dynamic loading modelling in 2D

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2D Dynamics is an add-on module to PLAXIS 2D. Soil and structures are often not only subjected to static loads due to construction in and on the ground surface but also to dynamic loads. When loads are powerful, like for example earthquakes, they may cause severe damages. Vibrations may occur either man-made or natural. The source of natural vibrations in the subsoil is earthquakes. With the Dynamics module PLAXIS can analyse the effects of vibrations in the soil.


When pseudo-static analysis is not enough

Low frequency vibrations can normally be calculated with a pseudo-static analysis, by default available in PLAXIS, however for more advanced seismic analysis the Dynamics module is required.

Advanced analysis made easy

The effects of vibrations have to be calculated with a dynamics analysis when the frequency of the dynamic load is in the order or higher than the natural frequency of the medium. PLAXIS helps users to perform dynamic analyses in a user friendly, efficient and accurate way.


Key Benefits

Apply simple and advanced constitutive models

All material models contain extra parameters, which take into account damping due to material and/or geometry. Models especially useful in dynamic analysis are for example the UBC Sand model in order to predict liquefaction. This model calculates excess pore pressure build-up during dynamic excitation. For soils other than liquefaction susceptible sand, the (Generalized) Hardening soil model with small strain stiffness generally offers a good choice.

Dynamic loading with earthquake data

In modelling the dynamic response of a soil structure the inertia of the subsoil and the time dependency of the load are considered. The time dependent behaviour of the load can be assigned through harmonic, linear or table multipliers. Via table input users can import real earthquakes signals, in order to perform meaningful seismic design, of for example jetties or foundations. Dynamic multipliers can be assigned independently in the x- and y-directions.

Advanced model boundary conditions

Dynamic analysis in some cases also requires some special boundary conditions. For the benefit of 1D site response analysis, the tied degrees of freedom boundary conditions are available in PLAXIS 2D. To reduce spurious reflections of waves reaching the model boundaries, free-field and compliant base boundaries can be selected.


Features

Modelling

  • Dynamic loading in x and y directions with real earthquake data
  • Upon request: UBCSAND liquefaction model (available as User-Defined Soil Model) (VIP)
  • Time-dependent dynamic load systems for point loads, distributed loads and prescribed displacements (velocities, acceleration)
  • Tied degrees of Freedom as dynamic boundary condition (VIP)
  • Rayleigh damping (aR and ßR) per material data set for soil layers and structures
  • Independent application of horizontal and vertical displacement (velocity, acceleration) components
  • Free Field & Compliant Base Boundaries (VIP)

Calculations

  • Simple 1D analysis or advanced earthquake engineering
  • Option to fix all nodes in vertical or horizontal direction in dynamic calculations
  • Option for semi-automatic determination of calculation sub-steps
  • Selection of Newmark time integration scheme (aN and ßN)
  • Dynamic multipliers for prescribed displacement, loads and bending moments (Dynamics)
  • Consistent or Lumped Mass Matrix calculations
  • Calculation type Dyamics available
  • Baseline correction for accelerogram
  • Automatic time stepping using dynamic sub-steps

Results

  • Velocities and acceleration in addition to displacements
  • Time-displacement, Time-velocity, Time-acceleration curves
  • Switch from time-curves to frequency-curves using Fast Fourier Transform
  • Pseudo Spectral Acceleration response spectrum
  • Liquefaction analysis
  • Envelopes of structural forces and displacements

Applications

  • Structural response under earthquake loading
  • Racking of tunnel lining
  • Machine and traffic vibrations
  • Impact loading
  • Evaluation of natural frequencies and resonance
  • Embankment stability under dynamic loading
  • Earthquake simulation
  • Dynamic soil-structure interaction

Pricing

  • PLAXIS VIP is an additional subscription system on top of the traditional licenses. With PLAXIS VIP you benefit from the latest releases of your PLAXIS software, special extensions and support from Plaxis technical experts.

    More info

    Flexible

    Network license. The number of licences is the number of users who can use PLAXIS at the same time.

    VIP €
  • PLAXIS VIP is an additional subscription system on top of the traditional licenses. With PLAXIS VIP you benefit from the latest releases of your PLAXIS software, special extensions and support from Plaxis technical experts.

    More info

    Standalone

    This license can be installed and used on one computer.


    VIP €
  • PLAXIS VIP is an additional subscription system on top of the traditional licenses. With PLAXIS VIP you benefit from the latest releases of your PLAXIS software, special extensions and support from Plaxis technical experts.

    More info

    Subscription

    Network or local. Subscribers have access to the software for the duration of the subscription period.

    Buy now and get a free extension until 31 March 2018

    Annual fee
    VIP €
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Educational license pricelist is available upon request

Educational License