지반의 비선형을 고려한 지반구조물 상호작용계의 지진응답해석

This paper demonstrates how nonlinear soil behavior in a soilstructure interaction system can be realistically incorporated by using a hybrid method in a nonlinear timedomain analysis. The hybrid method employs a generalpurpose nonlinear finite element program coupled with a linear SSI program for the unbounded layered soil medium In order to verify the validity and applicability of the hybrid method, nonlinear earthquake response analyses are carried out for the Hualien freefield problem, in which the ground and underground accelerations were measured during several earthquake events, and for a 2D subway station. It is found that the nonlinear earthquake responses predicted for the Hualien freefield using the hybrid method compare very well with the observed responses whereas the subway station example gives reasonable results.