Field testing of gravel-rubber mixtures as geotechnical seismic isolation

We present the results of the forced-vibration experiments performed at the large-scale prototype structure of EuroProteas founded on gravel-rubber mixture (GRM) layers acting as a means of Geotechnical Seismic Isolation (GSI). Three GRM with different rubber content per mixture weight (0%, 10%, and...

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Veröffentlicht in:Bulletin of earthquake engineering 2023-06, Vol.21 (8), p.3905-3922
Hauptverfasser: Vratsikidis, Athanasios, Pitilakis, Dimitris
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description We present the results of the forced-vibration experiments performed at the large-scale prototype structure of EuroProteas founded on gravel-rubber mixture (GRM) layers acting as a means of Geotechnical Seismic Isolation (GSI). Three GRM with different rubber content per mixture weight (0%, 10%, and 30%) but the same mean grain size ratio were used as foundation soil. Each GRM-structure system was subjected to harmonic forces in a wide range of excitation frequencies and force amplitude. It was found that a 0.5 m thick GRM foundation soil layer with 30% rubber content can effectively isolate the structure. The strong effect of the rubber fraction was expressed in the detected period elongation and the dominating rocking component which leads to a more “rigid-body” response of the structure. Moreover, the developed base shear and base moment are significantly reduced regardless of the excitation frequency, while the increased damping of the system and the important energy dissipation demonstrate the effectiveness of the GRM foundation soil layer. Overall, the experimental results demonstrated that the use of GRM as a GSI system can be considered as a low-cost alternative seismic isolation technique.
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subjects Civil Engineering
Damping
Earth and Environmental Science
Earth Sciences
Elongation
Energy dissipation
Energy exchange
Environmental Engineering/Biotechnology
Excitation
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Grain size
Gravel
Hydrogeology
Mixtures
Prototypes
Rubber
S.I. : Geotechnical Seismic Isolation
Seismic isolation
Soil
Soil layers
Soil structure
Soils
Structural Geology
Vibration
title Field testing of gravel-rubber mixtures as geotechnical seismic isolation
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