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Conference Article: Verification and improvement of analytical modeling of seismic isolation bearings and isolated structures

Forni, M.; La Grotteria, M.; Martelli, A. (National Agency for New Technology (Italy)); Bertola, S.; Bettinali, F.; Dusi, A. (ENEL-HYDRO Hydraulic and Structure Centre (Italy)); Bergamo, G.; Bonacina, G. (ENEL-HYDRO-ISMES Engineering and Testing Centre (Italy))

Abstract

Due to the complexity of dynamic behaviour of seismic isolation (SI) devices, high cost of their tests and non-negligible number of devices having excellent potential for nuclear applications, several countries judged of great interest to extend validation of their numerical models of such devices to the analysis of experimental data obtained by others. Thus, a four-years Coordinated Research Program (CRP) on Intercomparison of Analysis Methods for Isolated Nuclear Structures, proposed by ENEA (1995), was endorsed by the IAEA in 1995. There, Italy was jointly represented by ENEA, ENEL and ISMES, and supplied test results concerning both High Damping Rubber Bearings (HDRBs) and the MISS (Model of Isolated Steel Structure) mock-up, which had been isolated using such bearings. Test data provided by Italy to the other countries were also re-analysed to improve mathematical models. Aim of this final report is to summarise, after a brief description of the devices and structures considered, the most important results and conclusions of the numerical analyses carried out by Italy. For more detailed information, especially as far as the execution of the tests and the implementation of the numerical models are concerned, please refer to the technical reports presented by Italy to the Research Coordination Meetings (RCMs).

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key words: bearings; coordinated research programs; mathematical models; mechanical structures; numerical analysis; seismic detection; seismic isolation; soil-structure interactions

Reference:: Final report of a co-ordinated research project 1996-1999; International Atomic Energy Agency, Vienna (Austria); IAEA-TECDOC--1288, pp:29-77