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 non-dimensional frequency, structural nonlinearity, and number of stories on the contribution of soil material damping to the structural responses are detected.

Keywords:

Soil-Structure Interaction , Multi-Story Structures , Soil Material Damping , Seismic Demands