In this tutorial the influence of a vibrating source on its surrounding soil is studied. To reduce the calculation time, only one-quarter of the overall geometry is modelled, using symmetry boundary conditions along the lines of symmetry. The physical damping due to the viscous effects is taken into consideration via Rayleigh damping. Also, due to radial wave propagation, 'geometric damping' can be significant in attenuating the vibration.
The modelling of the boundaries is one of the key points in the dynamic calculation. In order to avoid spurious wave reflections at the model boundaries (which do not exist in reality), special conditions have to be applied in order to absorb waves reaching the boundaries.
This requires the Dynamics module.
The attached *.p3dlog file contains all the commands to generate the models up to calculation (without point for curves selection). With a Bentley Geotechnical SELECT Entitlement [GSE] (former PLAXIS-VIP) licence you can use the commands runner to open the *.p3dlog file and to execute all commands in one go. Without a VIP licence, you can open the *.p3dlog file with any text editor, like Notepad, and then execute the commands via the command line command by command.
PLAXIS 2D Tutorial 13: Dynamic analysis of a generator on an elastic foundation
PLAXIS 3D Tutorial 07: Rapid drawdown analysis
PLAXIS 3D Tutorial 09: Free vibration and earthquake analysis of a building