Abaqus Earthquake Analysis [upd] May 2026

Earthquake Analysis Using Abaqus: A Comprehensive Guide

1. Introduction

Earthquake analysis is a critical component of performance-based design for structures, dams, and nuclear facilities. While simplified equivalent lateral force methods exist, complex geometries and non-linear material behavior demand finite element analysis (FEA). Abaqus, with its robust material library (Concrete Damaged Plasticity, Mohr-Coulomb) and two solver architectures (Standard/Implicit vs. Explicit), is widely used for seismic simulation. This essay outlines the core steps to model an earthquake in Abaqus, focusing on boundary conditions, damping, and soil-structure interaction (SSI).

Step 3: Setting up the Analysis Step

  1. Create a Static, General step to apply gravity loads (Dead Load, Live Load). Earthquake analysis must start from the deformed state under gravity.
  2. Create a Dynamic, Implicit step for the earthquake.
    • Time Period: Set this to the duration of your earthquake record (e.g., 40 seconds).
    • Time Incrementation: Use "Automatic" incrementation. Set the initial, minimum, and maximum increments. For seismic analysis, the maximum time increment should generally be smaller than the recording interval of your ground motion data.

2. Choosing the Analysis Method

Before opening the software, you must determine the appropriate analysis method based on the project requirements. abaqus earthquake analysis

Part 8: Performance Tips for Long-Duration Records

A 60-second earthquake record in Abaqus/Explicit can require billions of increments. Mitigate with: Earthquake Analysis Using Abaqus: A Comprehensive Guide 1

  1. Mass scaling – increase stable time increment by adding non-physical mass to smallest elements. Keep added mass <5% of structural mass.
  2. Element deletion – set *SECTION CONTROLS, ELEMENT DELETION=YES – remove failed elements to reduce calculation.
  3. Subcycling – in multi-scale models, assign smaller time step to fine mesh regions only.
  4. Parallel processing – Abaqus supports domain decomposition (DMP). Use abaqus job=seismic cpus=16 parallel=domain.

For implicit analysis, use iterative solvers (*SOLVER, TYPE=ITERATIVE) which are 2-5× faster for large models. Create a Static, General step to apply gravity