Energy dissipation is critical. Engineers typically use , which defines damping as a function of mass and stiffness. Choosing the right
| Pitfall | Solution | | :--- | :--- | | | Raw earthquake data often has a velocity/position drift. If uncorrected, the structure will "fly away" or drift endlessly. Use a tool like SeismoSignal or MATLAB to correct the record before importing to Abaqus. | | Insufficient Damping | If the structure vibrates forever after the earthquake stops, damping is too low. Ensure Rayleigh coefficients are calculated for the dominant modes of the structure. | | Gravity Load Neglect | Earthquakes happen while the building is already under gravity. Always precede the dynamic step with a static gravity step or use *LOAD CASE to ensure pre-stress is accounted for. | | Rigid Body Modes | Ensure the model is properly constrained. If performing analysis on a soil block, use "Infinite Elements" or viscous boundaries (e.g., Lysmer-Kuhlemeyer dampers) to prevent waves from reflecting off the model boundaries. | abaqus earthquake analysis
The CSV must contain two columns: time (sec) and acceleration (g or m/s²). Ensure zero initial acceleration and proper baseline correction. Energy dissipation is critical
Unlike static analysis, where inertial ($M\ddotu$) and damping ($C\dotu$) forces are ignored, earthquake analysis in Abaqus solves this full equation. The software utilizes numerical integration schemes (such as the Hilber-Hughes-Taylor method) to solve these equations step-by-step over the duration of the earthquake. If uncorrected, the structure will "fly away" or
Choosing the right solver is critical for accuracy and performance: Abaqus Software For Civil Engineering | 101 Tutorials