SEISMIC ISOLATION UNDER THE BASE MAT OF STRUCTURE INTERACTING WITH SOIL. PART II: MULTI-DIMENSIONAL LINEAR MODEL

Authors:  
Rubric:     Theoretical and experimental studies   
Annotation:
Seismic isolation under the base mat has a special feature: the lower plate of the seismic isolation system (SIS) interacts with soil foundation. These SSI effects are of special importance for heavy structures. In terms of “platform model” under the lower base mat there is a “soil support” with certain stiffness and damping. SIS provides another support sequentially linked to the “soil support” via the lower base mat. The combined effect of these two supports depends on the combination of their parameters. In the first part of the paper the author used the simplest one-dimensional model. In the second part he studies the multi-dimensional model enabling the consideration of the link between horizontal and rocking responses.