engleski

Response spectrum shape piloted by inverted pendulums free to rock

Response spectrum (RS) is one of the best accepted tools for seismic analysis and design. In spite of its many improvements, almost 95 year old concept still does not recognize potential benefits of structural rocking, soil compliance and dissipation of energy through radiation. Accordingly, design practice often use numerical procedures based on the assumption of a fixed-base structure. Also, a common assumption is that introduction of soil-structure interaction (SSI) is beneficial on seismic response of structures since it elongates the fundamental periods. As a direct consequence of the RS shape defined in codes, elongated period may spuriously result in reduced inertia forces. Results of research considered shallow founded linear-elastic inverted pendulum systems, as equivalent systems for real structures, lying on soft soil are discussed. Also, this paper shows how the SSI affects the response of the pendulums and thus the shape of the RS. Soil was modeled as dry sand. Numerical modeling was done using an advanced non-linear soil model calibrated using geotechnical centrifuge. Ground motions recorded on the Balkan Peninsula were used in research.

response spectrum; shallow foundations; soft soil; soil-structure interaction Eurocode

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