Multi-storey Structures With Compound
Seismic Isolation
Author(s)
M. C. Phocas & G. Pamboris
Abstract
Seismic isolation, one of the most innovative technologies in the area of
performance-based design of buildings, has been increasingly used in the last 15
years worldwide. Seismic isolation is principally based on the incorporation of
flexible isolators at the base of a building in order to shift its fundamental period
outside the dangerous for the resonance range of periods. In extending the
concept of base isolation, the present contribution refers to the control of multistorey
structures under earthquake actions by means of introducing seismic
isolation at different elevations of the structure. Thus, the structural response is
influenced decisively by the vertically distributed seismic isolation, which at the
respective storey-levels is alone capable of controlling the partial and overall
stiffness, the force transmission and the energy dissipation process of the
respective dynamic adaptable system. During moderate earthquakes the seismic
isolated structure acts as an absorber of the kinetic energy at the isolation levels,
thus minimizing the displacements of the building. During strong earthquakes
the effectiveness of the system in further enlarging the period of the building,
compared to the classical method of seismic isolation at a unique level, is
achieved, most often with decreased inter-storey deflections, and without
introducing extensive displacements at the building base, which are often limited
by practical constraints. The effectiveness of the proposed control system is
investigated in parametric studies, in the time-history range, for a six-storey
building under ten earthquakes of the Greek-Mediterranean region. The most
effective vertical distribution of seismic isolation at various storey-levels is
proposed, based on a multi-criteria analysis of the responses of the isolated
systems.
Keywords: structural control, seismic isolation, seismic performance.
Keywords
structural control, seismic isolation, seismic performance.
Related Book
Other papers in this volume
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