| Pitfall | Consequence | Fix in Abaqus | | :--- | :--- | :--- | | No quiet boundary | Wave reflections double displacements | Add infinite elements or dashpots | | Rayleigh damping with high ALPHA | Suppresses physical rocking | Set ALPHA=0 ; use BETA only | | Mass scaling in Explicit | Artificially increases inertia | Limit to <5% of total mass; monitor kinetic/ internal energy ratio | | Zero initial stress in soil | Unrealistic settlement | Run *GEOSTATIC step before earthquake |
Apply earthquake acceleration time histories ( *AMPLITUDE ) at the base of the model. 3.5. Step Configuration Set up the simulation to run in multiple steps: Gravity/Static Step: Apply self-weight. Frequency Step: Calculate natural frequencies and modes. Dynamic Step: Run the time-history simulation. 4. Modeling Soil-Structure Interaction (SSI) abaqus earthquake analysis
: Best for relatively slow dynamic events or long-duration seismic records where high accuracy for low-frequency response is needed. | Pitfall | Consequence | Fix in Abaqus
What are you analyzing (e.g., concrete building, steel bridge, dam)? Do you plan to include soil-structure interaction (SSI) ? Frequency Step: Calculate natural frequencies and modes
| Pitfall | Consequence | Fix in Abaqus | | :--- | :--- | :--- | | No quiet boundary | Wave reflections double displacements | Add infinite elements or dashpots | | Rayleigh damping with high ALPHA | Suppresses physical rocking | Set ALPHA=0 ; use BETA only | | Mass scaling in Explicit | Artificially increases inertia | Limit to <5% of total mass; monitor kinetic/ internal energy ratio | | Zero initial stress in soil | Unrealistic settlement | Run *GEOSTATIC step before earthquake |
Apply earthquake acceleration time histories ( *AMPLITUDE ) at the base of the model. 3.5. Step Configuration Set up the simulation to run in multiple steps: Gravity/Static Step: Apply self-weight. Frequency Step: Calculate natural frequencies and modes. Dynamic Step: Run the time-history simulation. 4. Modeling Soil-Structure Interaction (SSI)
: Best for relatively slow dynamic events or long-duration seismic records where high accuracy for low-frequency response is needed.
What are you analyzing (e.g., concrete building, steel bridge, dam)? Do you plan to include soil-structure interaction (SSI) ?