Abstract
The present study focuses on the input loss of deeply embedded foundations that support bridges and viaducts. It is widely known that the strain dependency of soil dominates in surface layers supporting the foundations when subjected to strong motions. Therefore, it is desirable to know how the input loss is affected by the strain dependency accompanied by changes in stiffness and damping of soil. This study investigates the influence of strain dependency on the input loss by means of vibration tests and a theoretical approach of a closed form solution of input loss with a constitutive model for the nonlinearity of soil. The present study gives physical understanding for the relation of the strain dependency and the input loss.
