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Seismic codes
Seismic codes
The Research Unit of SDGEE has extensive experience developing and revising seismic codes, including Eurocode 8 and the Greek National Seismic Code.
In particular, in the under revision EC8, it has been officially and actively involved in Part1.1 (seismic actions) and Part5 (Surface and deep foundation, SFSI, slopes, liquefaction, retaining walls, and the new section of tunnels and underground structure where it was the principle responsible). Typical results of this strong involvement are the proposal of the National Greek Annex of the New Seismic Zonation map of Greece and the new site classification and site amplification.
Proposal of detailed soil classification system
Proposed Intensity-dependent soil amplification factors
Microzonation studies
Microzonation studies
We perform high-technology microzonation studies applying: probabilistic & deterministic seismic hazard analysis; geological, geophysical, and geotechnical surveys; in-situ and lab testing of soil properties; experimental and theoretical site-effect analysis using available records and 1D, 2D, and 3D numerical models, also analyzing of complex effects (basin, topography).
The final deliverables are detailed microzonation maps of the geotechnical conditions as well as the acceleration, velocity, and displacement design spectra for different return periods, liquefaction, subsidence, and landslide zones and seismic code-compliant site-effect evaluations and design parameters.
Thessaloniki (Greece): Spatial distribution of ground shaking parameters (PGV) and settlements due to liquefaction (PGD) for a seismic scenario with 10% probability of exceedance in 50 years
Soil-Foundation-Structure Interaction (SFSI)
Soil-Foundation-Structure Interaction (SFSI)
Numerical model of EuroProteas SFSI system
The SDGEE Research Unit has extensive experience investigating complex SFSI problems through experimental studies using the full-scale EuroProteas facility at EuroSeistest and advanced 3D numerical modeling of coupled soil-foundation-structure systems. Our expertise includes analyzing and designing surface and deep foundations, bridge foundations, and piers and implementing linear, equivalent-linear, and non-linear models.
We also address structures' vulnerability to SFSI effects, model soil-tunnel-structure and structure-soil-structure interactions, and support performance-based design approaches. Additionally, we develop and apply dynamic impedance functions for foundation systems, including those supporting monumental structures.
Experimental verification and design of Geotechnical Seismic Isolation
Experimental verification and design of Geotechnical Seismic Isolation
We explore innovative soil improvement methods and low-cost seismic isolation techniques to enhance structural safety and reduce seismic risk. We use eco-friendly materials like volcanic pumice and recycled tire rubber, combining improved seismic performance with environmental benefits.
Services and research include laboratory testing of soil–rubber and soil–pumice mixtures and studying factors affecting dynamic behavior (rubber content, grain size, material ratios).
Application of GRM seismic isolation in the EuroSeistest facility
Numerical analysis and seismic design of geotechnical structures
Numerical analysis and seismic design of geotechnical structures
We specialize in analyzing and designing geotechnical systems, including surface and deep foundations, retaining structures, slopes, tunnels, and underground works. Our work focuses on developing analytical models and design recommendations, supported by advanced numerical analysis, to ensure the safety and performance of structures such as foundations, retaining walls, and embankments.
3D numerical analysis of a tunnel crossing a fault and an adjacent station. Settlements 3D contour.
Soil-foundation-structure interaction and topographic effects
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