DYNAMIC-RESPONSE OF A GROUP OF FLEXIBLE FOUNDATIONS TO INCIDENT SEISMIC-WAVES

The dynamic response of a finite number of flexible surface foundation s subjected to harmonic incident Rayleigh or SH waves is presented. Th e foundations are assumed to be resting on an elastic half-space. The results show that the foundation stiffness has a marked effect on the vertical response, while there is only a minor effect on the horizonta l displacements. In general, the dynamic response decreases with incre asing foundation stiffness. In cases of Rayleigh wave incidence, the e xistence of an adjacent foundation generates a certain amount of horiz ontal response in the direction perpendicular to the incident wave and subsequently causes the system to undergo a torsional motion; while i n cases of horizontally incident SH waves, a Vertical response has bee n observed and its magnitude is comparable to the response in the dire ction of the incident wave. (C) 1998 Elsevier Science Limited.