Seismic-Isolation Buildings under Large-Magnitude Earthquake Motions

Abstract eng:
Most urban areas in the world have been developed on alluvial plains, where earthquake motions having long period components may be excited under distant but large magnitude earthquakes amplified by the surface geology as deep as a few thousand meters. This paper reports the response of 10-story reinforced concrete base-isolated buildings to ground motions simulated for large-magnitude earthquakes. If columns are assumed to lose vertical load carrying capacity after the design shear force is developed, the structure collapses in the upper stories after large response deformation is developed in the seismic isolation layer; i.e. even low stiffness of the seismic isolation device develops large shear after such deformation. If the pounding of the first floor of the super structure against surrounding retaining walls is considered in the analysis, the collapse occurs in the lower stories. It is essential even in the design of base isolated buildings to provide ductility on the basis of the weak-beam strong-column concept against unexpected disturbances.

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