Abstract
An equivalent linearization analysis based on the elastic beam foundation theory, i.e. spring model, has frequently been used on actual structural foundation designs. A method to convert the nonlinear properties of soil to an equivalent linear model in order to conduct rational calculations is required. The purpose of this study was to examine whether the relationship between the soil strain level and structural deformation level can be used to simplify the model from applicability to actual structural design. From the results, a versatile scheme to set the rational modulus of a subgrade reaction in various structural deformation levels was presented with consideration for the relationship between the structural deformation level and soil strain level.
