CONTRIBUTION OF SOIL MATERIAL DAMP-ING TO THE DEMANDS OF SOIL-MDOF STR-UCTURE SYSTEMS

In this paper, the role of soil material damping in the seismic response of soil-structure systems is investigated subjected to 59 ground motions. For this purpose, the superstructure is modeled as a nonlinear multi-degree-of-freedom shear building. The beneath soil is simulated based on the cone model concept. The 3-, 10-, 15- and 25-story models are considered as low- and high-rise buildings, respectively. Two values of 0 and 0.25 are assigned to soil material damping in order to show how soil material damping affects the responses. A comprehensive parametric study is carried out and effects of various parameters such as nondimensional frequency, structural nonlinearity, and number of stories on the contribution of soil material damping to the structural responses are detected.