THE ROLE OF NATURAL-RUBBER IN SEISMIC ISOLATION - A PERSPECTIVE

The "base-isolation" technique for protecting buildings against earthquakes is based on the fundamental physics of systems in oscillation. It relies on lowering the natural frequency of the building/support system below that of the major frequencies present in the earthquake. Although simple in concept, many years of development have been required to convert it into a practical, reliable system. Seen fifteen years ago as an eccentric dream, base isolation is today recognized as the only feasible method of protecting some buildings and their contents, and as an attractive option for a widening range of other types. In most practical systems, natural rubber has an essential role.