WP5 — Seismic Performance of Structures of Large Dimensions Subjected to the Incidence of “3D” Motions with Surface Waves
Leader: Charisis Chatzigogos (GDS)
WP5 integrates the tools developed in WP2–WP4 to study the seismic performance of large-dimension structures — principally large industrial buildings, with an emphasis on nuclear buildings — subjected to full “3D” seismic motions with significant surface-wave components, drawn from GDS's inventory of structures designed for critical industrial facilities.
Tasks
- Task 5.1 — Parametric study of the impact of full “3D” seismic motion on large structures: compares representative large-dimension structures under full “3D” wave regimes and the equivalent simplified “3×1D” approximation, using at least two finite-element codes recognised in the nuclear industry — Code_ASTER and ESSI-Simulator — for comparison and validation. It studies global stability, structural-member and mat-foundation design, and how response spectra transfer within the structure, in order to identify which configurations are most sensitive to surface waves and how large the margin is between the exact “3D” motion and the conventional “3×1D” approximation.
- Task 5.2 — Guidelines for the validity domain of methods for definition of incident seismic motions, from 1D to 3D: compiles the results of all work packages into a concise set of rules and guidelines defining the validity range of conventional 1D site-response methods for large-dimension structures, with instructions for identifying and treating cases that require going beyond the 1D approach.
Milestones
- M5.1 — Extensive parametric and comparative study on the effects of full “3D” seismic motions on the response of large structures
- M5.2 — Design recommendations and guidelines for the validity range of methods for incident seismic motion definition, from 1D to 3D
Deliverables
- D5.1 — Report on the parametric study of the impact of full “3D” motions with surface waves on seismic response of large structures
- D5.2 — Final report with guidelines for site response analysis and SSI of large structures, from 1D to 3D