The Inspection of Dimensions and Geometry of Disks on Their Dynamic Stiffness Using the Cone Model

To anticipate the response of the foundation to seismic excitations including earthquakes and blasts it isessential to have at hand the dynamic stiffness of the foundation as a component of the impedance basedon the dimension and geometry of the foundation and conditions of the site soil.Many different types offoundations can be and have already been investigated, yet effects of shapes and dimensionsare still to bestudied. In this paper a typical range of disks has been inspected with the Cone Model propagation ofincident waves and dynamic stiffness of different foundations under different excitation frequencies forhorizontal, vertical, torsional and rocking response has been calculated and then compared. The shapesresulting in greatest and smallest dynamic stiffness have been pointed out and fields for furtherexploration are suggested.

Keywords:

seismic excitation , earthquake , impedance , disk , Cone Model