Recent earthquakes (Bucharest, 1977; Mexico City, 1985; Kobe, 1995) have shown clearly the great influence of soil-structure interaction (SSI) in the seismic response of structures to earthquakes. Unfortunately, many seismic codes do not consider SSI or consider SSI detrimental only for some specific structures, because generally SSI leads to higher fundamental periods and then, considering the general shape of response and design spectra of seismic codes, to smaller accelerations and stresses in the structure. But, the response spectra of several recent earthquakes were characterized by a very high predominant period. The analysis of SSI could be performed by means of different approaches: the two approaches discussed in the present paper are experimental modelling by means of shaking table tests and numerical modelling by means of a FEM code. A 1:6 scaled steel model resting on a sand deposit is subjected to sinusoidal input motions of different amplitudes and constant frequency and duration. A good agreement is obtained comparing experimental and numerical results, in terms of acceleration and displacement.
Experimental and numerical modelling of a scaled soil-structure system
MASSIMINO, MARIA ROSSELLA
2005-01-01
Abstract
Recent earthquakes (Bucharest, 1977; Mexico City, 1985; Kobe, 1995) have shown clearly the great influence of soil-structure interaction (SSI) in the seismic response of structures to earthquakes. Unfortunately, many seismic codes do not consider SSI or consider SSI detrimental only for some specific structures, because generally SSI leads to higher fundamental periods and then, considering the general shape of response and design spectra of seismic codes, to smaller accelerations and stresses in the structure. But, the response spectra of several recent earthquakes were characterized by a very high predominant period. The analysis of SSI could be performed by means of different approaches: the two approaches discussed in the present paper are experimental modelling by means of shaking table tests and numerical modelling by means of a FEM code. A 1:6 scaled steel model resting on a sand deposit is subjected to sinusoidal input motions of different amplitudes and constant frequency and duration. A good agreement is obtained comparing experimental and numerical results, in terms of acceleration and displacement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
