LAUSR

ABSTRACT Material damping arises due to the soil present beneath the foundation and controls the behaviour of the foundation under dynamic excitation. In the present study, an attempt has been taken to observe the effect of soil material damping on the dynamic response of foundation under rocking and torsional motion. A recent trend in present methods of dynamic analysis of foundation in the frequency domain is to find out the dynamic impedance functions, i.e. spring coefficient and damping coefficient. For foundation under rotational motion, i.e. rocking and torsion, the material damping is introduced using the Kelvin model and the results thus obtained are compared with those obtained by Hysteretic model and Voigt model. Parameter sensitivity analysis is carried out to determine the most influencing parameter. The study suggests that foundation under rocking motion is non-linearly influenced by the Poisson’s ratio of soil.