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Performance of geotechnical seismic isolation system using rubber‐soil mixtures in centrifuge testing
Author(s) -
Tsang HingHo,
Tran DucPhu,
Hung WenYi,
Pitilakis Kyriazis,
Gad Emad F.
Publication year - 2020
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.3398
Subject(s) - centrifuge , geotechnical engineering , foundation (evidence) , natural rubber , shaker , structural engineering , engineering , rotation (mathematics) , shallow foundation , subsoil , geology , soil water , bearing capacity , materials science , computer science , vibration , soil science , composite material , physics , nuclear physics , archaeology , quantum mechanics , artificial intelligence , history
Geotechnical seismic isolation (GSI) system involves the dynamic interaction between structure and low‐modulus foundation material, such as rubber‐soil mixtures (RSM). Whilst numerical studies have been carried out to demonstrate the potential benefits of GSI‐RSM system, experimental research is indispensable for confirming its isolation mechanism and effectiveness in reducing structural demand. In this regard, centrifuge modelling with an earthquake shaker under an acceleration field of 50 g adopted in this study can mimic the actual nonlinear dynamic response characteristics of RSM and subsoil in a coupled soil‐foundation‐structure system. This is the first time the performance of GSI‐RSM system was examined in a geotechnical centrifuge. It was found that an average of 40‐50% reduction of structural demand can be achieved. The increase in both the horizontal and rotation responses of the foundation was also evidenced. The unique augmented rocking mechanism with reversible foundation rotation was highlighted.