[Part/Mesh Generation] ➔ [Material Modeling] ➔ [Initial/Gravity Step] ➔ [Seismic Step & Loads] ➔ [Solving] Step 1: Geometry and Mesh Generation
: 4-story RC frame subjected to El Centro 1940 NS (scaled to PGA=0.3g). abaqus earthquake analysis
Boundary conditions constrain the model appropriately for each analysis phase. For fixed-base analysis, all degrees of freedom at the foundation level are restrained during the dynamic step. For SSI analysis, the soil domain requires transmitting boundaries—either viscous boundaries (spring-dashpot combinations) or more advanced formulations implemented via user subroutines. abaqus earthquake analysis