@conference {bnh-8345, title = {Geotechnical seismic isolation system based on rubber-soil mixtures: analytical modelling, experimental testing and field measurement}, booktitle = {20th International Conference on Soil Mechanics and Geotechnical Engineering}, year = {2022}, month = {06/2022}, address = {Sydney}, abstract = {

The innovative concept of geotechnical seismic isolation (GSI) with the use of a continuous layer of low-modulus
rubber-soil mixtures (RSM) surrounding the foundation of the structure has attracted considerable research interest globally in the
past decade. This paper presents a summary of the recent works completed by the authors. This includes an equivalent-linear lumped-parameter analytical model for explaining the isolation mechanism of the GSI system. On the other hand, the effectiveness of the isolation system has been validated by geotechnical centrifuge modelling. Its dynamic soil-structure interaction behaviour has also
been demonstrated by using the Euroeseistest-EuroProteas model structure (http://euroseisdb.civil.auth.gr). It has been confirmed
that the controlled stiffness and damping of the GSI-RSM foundation layer can reduce the rocking stiffness, thereby enhances the
seismic isolation capability, whilst without having large permanent deformations due to the higher elasticity of the RSM material.
Finally, a series of shaking table tests have also been conducted to examine the effectiveness of GSI-RSM system on isolating
electrical transformers. Generally, it was found in these studies that a 30\% to 60\% reduction of structural demand can be achieved.

}, keywords = {augmented rocking, geotechnical seismic isolation, rubber-soil mixtures, soil-structure interaction, waste tyre}, url = {https://www.researchgate.net/profile/Dimitris-Pitilakis/publication/361275994_20ICSMGE-Full-Paper-final/links/62a840f06886635d5cd89d75/20ICSMGE-Full-Paper-final.pdf}, author = {Hing-Ho Tsang and Kyriazis Pitilakis and Sheng Li and Wen-Yi Hung} } @article {bnh-7687, title = {Performance of geotechnical seismic isolation system using rubber-soil mixtures in centrifuge testing}, journal = {Earthquake Engineering and Structural Dynamics}, year = {2020}, month = {11/2020}, abstract = {

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.

}, keywords = {augmented rocking mechanism, centrifuge, geotechnical seismic isolation, rubber-soil mixtures, waste tyre}, doi = {https://doi.org/10.1002/eqe.3398}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/eqe.3398}, author = {Hing-Ho Tsang and Duc-Phu Tran and Wen-Yi Hung and Kyriazis Pitilakis and Emad F Gad} }