Methods and systems for determining ground motion in a simulation of seismic soil-structure interaction

A system comprising:

• a memory storing instructions;
• one or more processors coupled to the memory, the one or more processors executing the instructions from the memory to perform a method:
• receiving a three-dimensional (3D) model representing a soil domain and a ground motion time history of a seismic event, the ground motion time history measured at the top of the soil domain;
• generating a single-column model containing nodal points mapped from nodes of the 3D model in the soil domain's depth direction;
• determining a time interval for calculating soil motion and stresses at the nodal points along the single-column model from the ground motion time history, the time interval used to perform fast Fourier Transform (FFT) on the ground motion time history;
• and
• simulating the seismic event based on the 3D model applied with the soil motion and stresses transferred from the single-column model.

A non-transitory computer-readable medium storing instructions for commanding one or more processors to perform operations comprising:

• receiving a three-dimensional (3D) model representing a soil domain and a ground motion time history of a seismic event, the ground motion time history measured at the top of the soil domain;
• generating a single-column model containing nodal points mapped from nodes of the 3D model in the soil domain's depth direction;
• determining a time interval for calculating soil motion and stresses at the nodal points along the single-column model from the ground motion time history, the time interval used to perform fast Fourier Transform (FFT) on the ground motion time history;
• and
• simulating the seismic event based on the 3D model applied with the soil motion and stresses transferred from the single-column model.