The FEM - Earthquake is used to perform dynamic analysis of geotechnical structures loaded by ground motion. It either accepts user-defined accelerograms or generates ground motion histories compatible with the specified response spectrum. The program outputs the evolution of displacements, stresses, internal forces and other mechanical quantities and summariSes their maximum values. It also performs modal analysis to acquire eigenfrequencies and eigenmodes of the system for setting the material damping. 
Licence price £652 
Available in packages: 
Accelerogram generation 
Earthquake analysis results 
Eigenvalue analysis results 
FEM Extension Modules: 
FEM – Tunnel – Tunnel Analysis 
FEM – Water Flow – Groundwater Seepage Analysis 
FEM – Consolidation – Time Dependent Settlement Analysis 
Earthquake is an extension module of the FEM program for the analysis of general geotechnical problems. 
Main Features 
Material models: 
Linear elastic model 
Mohr-Coulomb model 
Modified Mohr-Coulomb model 
Drucker-Prager model 
Material damping 
Damping ratio 
Automatically computed or user defined Rayleigh damping coefficients 
User defined acceleration history 
Automatically generated accelerograms compatible with Eurocode 8 response 
Boundary conditions 
Fixed boundary conditions on bottom boundary for models truncated at soft soil/stiff rock interface 
Quiet (non-reflective) boundary conditions on bottom boundary for models truncated within soil/rock layer 
Radiation and traction boundary conditions on lateral boundaries to properly address far-field conditions 
Modal analysis 
Eigenfrequencies and eigenmodes 
Modal participation factors and modal effective mass to identify eigenmodes participation in horizontal and vertical direction 
Run earthquake analysis in any construction stage 
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