Preface for the special issue on geotechnical seismic isolation (GSI)

Tsang, Hing‐Ho; Pitilakis, Kyriazis

doi:10.1007/s10518-023-01694-y

Bull Earthquake Eng

2023

DOI: 10.1007/s10518-023-01694-y

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Preface for the special issue on geotechnical seismic isolation (GSI)

Hing‐Ho Tsang

Kyriazis Pitilakis

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Cited by 9 publications

References 14 publications

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Analytical design models for geotechnical seismic isolation systems

Tsang

2022

Bull Earthquake Eng

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Geotechnical Seismic Isolation (GSI) can be defined as a new category of seismic isolation techniques that involve the dynamic interaction between the structural system and geo-materials. Whilst the mechanism of various GSI systems and their performance have already been demonstrated through different research methods, there is a missing link between fundamental research and engineering practice. This paper aims to initiate the development in this direction. A new suite of equivalent-linear foundation stiffness and damping models under the same framework is proposed for four GSI configurations, one of which is a novel combination of two existing ones. The exact solutions for the equivalent dynamic properties of flexible-base systems have also been derived that explicitly include the foundation inertia and the strain-dependent equivalent damping of foundation materials, which are both significant for GSI systems. The application of the proposed analytical design models has been illustrated through response history analyses and a detailed hand-calculation design procedure has also been outlined and demonstrated.

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Analytical design models for geotechnical seismic isolation systems

Tsang

2022

Bull Earthquake Eng

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Geotechnical seismic isolation based on high-damping polyurethane: centrifuge modelling

Tsang,

Tran,

Hung

et al. 2024

Bull Earthquake Eng

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Geotechnical seismic isolation (GSI) is a new category of low-damage resilient design methods that are in direct contact with geomaterials and of which the isolation mechanism primarily involves geotechnics. Various materials have been explored for placing around the foundation system in layer form to facilitate the beneficial effects of dynamic soil-foundation-structure interaction, as one of the GSI mechanisms. To reduce the thickness of the GSI foundation layer and to ensure uniformity of its material properties, the use of a thin and homogeneous layer of high-damping polyurethane (HDPU) was investigated in this study via centrifuge modelling. HDPU sheets were installed in three different configurations at the interface between the structural foundation and surrounding soils for realising GSI. It was found that using HDPU for GSI can provide excellent seismic isolation effects in all three configurations. The average rates of structural demand reduction amongst the eight earthquake events ranged from 35 to 80%. A clear correlation between the period-lengthening ratio and the demand reduction percentage can be observed amongst the three GSI configurations. One of the configurations with HDPU around the periphery of the foundation only is particularly suitable for retrofitting existing structures and does not require making changes to the structural systems or architectural features.

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Dynamic leaching assessment of recycled polyurethane-coated tire rubber for sustainable engineering applications

Akhtar,

Tsang

2024

Chemical Engineering Journal

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Preface for the special issue on geotechnical seismic isolation (GSI)

Cited by 9 publications

References 14 publications

Analytical design models for geotechnical seismic isolation systems

Analytical design models for geotechnical seismic isolation systems

Geotechnical seismic isolation based on high-damping polyurethane: centrifuge modelling

Dynamic leaching assessment of recycled polyurethane-coated tire rubber for sustainable engineering applications

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