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LIMITS AND APPLICABILITY IN SEISMIC BASE ISOLATION OF THE STRUCTURES IN ROMANIA

Bogdan Felix Apostol, Stefan Florin Balan, Dinu Bratosin

Abstract

The technique named "base isolation", resorts to place at the bottom of buildings special components, leading to long fundamental periods that would avoid resonance tendency of buildings with its site in the case of strong earthquakes. The nonlinear characteristics of the isolator layer change the linear period-shift estimation and can lead either to dangerous shortening shift in case of hardening nonlinearity or to unnecessary shift enlargement in case of softening nonlinearity. By neglecting this period-shift dispersion of the base isolation technology пїЅ the drawing out of structure from dangerous resonant zone - can be compromised. The vulnerability of a structure to strong earthquakes can be appreciated by comparing its fundamental period with the fundamental period of soil deposit. Under high stresses the rocks became nonlinear dependent of their dynamic characteristics. Oscillating systems with non-linear behavior (as a consequence of materials) have multiple resonances. This behavior imposes a new assessment for period-shift due to nonlinearity. The dispersion of the natural periods with respect to the loading is an important factor. In the same time, the period-shift from a fixed-base to an isolated base of the same structure depends on the nonlinear characteristics of the isolator and site layers. By neglecting the nonlinear aspects, a base-isolated structure may be brought in resonant conditions even if the structural and isolated layer natural periods are different

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DOI resolver: doi.org/10.5593/sgem2017/14/s05.027

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