Spatially variable ground motion (SVGM), the difference in seismic excitation across a bridge's supports, can go unaccounted for in conventional analysis, understating demand on long or multi span bridges by 30 percent or more.
The updated Eurocode 8 Part 2 introduces clear criteria for when this must be addressed, and a simplified method to account for it without a full spatial ground motion analysis. Prof. Anastasios Sextos, who sits on the Eurocode drafting committee behind these provisions, walks through the new decision framework, the simplified method, and validation against real instrumented bridges.
Learn when the new EN1998–2 provisions require spatial variability analysis in bridge design, and how to apply them without a full simulation.
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