Comparison of Site Response Analysis (SRA) according to ground modelling and structure consideration

When an earthquake occurs, the seismic motion is amplified as it passes through the ground layers. In addition, even for the same earthquake, the magnitude of the ground response on the ground surface varies depending on the ground condition. Determining the response within the ground following an earthquake is called site response analysis (SRA), and a general standard procedure is to perform site response analysis using the 1D (one-dimensional) wave propagation theory. However, in the case of one-dimensional site response analysis, complex topography, ground surface changes, and effects on structures are not included. Therefore, evaluating the reasonable ground response that may occur in the actual field is necessary. This article analyses ground amplification phenomena according to modelling differences through 2D (two-dimensional) and 3D (three-dimensional) modelling that can consider complex topography in addition to 1D. In addition, the nonlinear characteristics of the soil and the interaction between the soil and the structure were considered, and time history analysis was performed to identify the realistic dynamic behaviour characteristics of the soil and structure.