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    GEIW | Global Engineering Insights Webinar Seismic Design of Bridges under Spatially Variable Ground Motion:
    New Eurocode 8 Part 2 Provisions and Practical Design Implications

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    AI Summary

    Spatially variable ground motion is a measured pattern, confirmed worldwide, that the updated Eurocode 8 part 2 now requires engineers to check. In this session, Prof. Sextos explains why it goes further than most seismic codes worldwide in addressing it, a step he believes every code should eventually take. 

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    Description

    Spatially variable ground motion (SVGM) is the difference in seismic excitation experienced across a bridge's supports, a key factor in seismic risk for long or multi span bridges, and the subject of this on demand session.

     

    Addressing it does not have to mean a full spatial ground motion simulation. The session shows how the updated EN1998–2 lets you screen most projects with a single table first, then walks through the simplified method for the ones that do need it.

    Key Takeaways

    Start with the table, not the analysis.
    A short table based on bridge length, span, and soil condition tells you in minutes whether SVGM applies to your project at all.

    If it does, here is the method.
    Run a standard modal analysis, apply two additional static analyses using prescribed amplification factors on the bridge's first and second antisymmetric modes, then combine all three through SRSS.

    It is built to never underestimate demand.
    By design, it cannot return a lower result than a standard response spectrum analysis alone.

    It has been checked against real bridges.
    On both Lissos and Metsovo, the simplified prediction fell within the statistical range of a full, rigorous physics based analysis.

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    Speaker

    Anastasios Sextos Professor of Earthquake Engineering, University of Bristol, UK / National Technical University of Athens, Greece University of Bristol
    He serves on the drafting committee of the Structural Eurocodes, the same body behind the EN1998–2 provisions covered in this session, and has authored more than 110 journal papers on earthquake engineering and bridge seismic design. His research includes a GCRF funded project in Nepal that delivered the world's first building on a low cost PVC based seismic isolation system. 
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