Abstract
An equivalent linearization analysis based on the elastic beam foundation theory has frequently been used on actual structural foundation designs. The deformation modulus of soil, which is defined as the secant incline in the stress-strain relationship, is the most important parameter on an equivalent linearization analysis. Specifically, the deformation modulus of soil should be adjusted in accordance with the deformation level of the foundations and the strain level of the soil. In this study, theoretical approaches were conducted with regard to the relationship and consistency between primary soil investigations. Furthermore, strain dependence modeling for the modulus of soil has been considered via a statistical approach using a large-scale soil investigation database conducted at bridge construction sites. From the above considerations, a practical estimation method to evaluate the rational deformation modulus of soil is presented based on soil investigations and SPT-N values.
