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Seismic Working Group

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Seismic Working Group

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    1. Seismic Working Group 9/27/2007 1 U Colorado Boulder Workshop on Dam Safety R&D Needs

    2. 9/27/2007 2 U Colorado Boulder Workshop on Dam Safety R&D Needs

    3. 9/27/2007 3 U Colorado Boulder Workshop on Dam Safety R&D Needs

    4. 9/27/2007 4 U Colorado Boulder Workshop on Dam Safety R&D Needs

    5. 9/27/2007 5 U Colorado Boulder Workshop on Dam Safety R&D Needs

    6. 9/27/2007 6 U Colorado Boulder Workshop on Dam Safety R&D Needs

    7. 9/27/2007 7 U Colorado Boulder Workshop on Dam Safety R&D Needs

    8. 9/27/2007 8 U Colorado Boulder Workshop on Dam Safety R&D Needs

    9. 9/27/2007 9 U Colorado Boulder Workshop on Dam Safety R&D Needs

    10. 9/27/2007 10 U Colorado Boulder Workshop on Dam Safety R&D Needs

    11. Survey Responses Research Needs Included: Inelastic behavior Seismic Excitation Post-EQ Analyses (back analyses) Validation of Structural Analyses Failure Modes Initiation of failure and post-EQ damage Deformation and liquefaction of embankment dams Soil-Structure interaction of spillway walls next to embankments Probabilistic Methods of Analysis See next slide Simplified Methods for Low Seismic Zones Particularly in Eastern US 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 11

    12. 9/27/2007 12 U Colorado Boulder Workshop on Dam Safety R&D Needs

    13. 9/27/2007 13 U Colorado Boulder Workshop on Dam Safety R&D Needs

    14. 9/27/2007 14 U Colorado Boulder Workshop on Dam Safety R&D Needs

    15. Concrete Dams Failure Modes Validation of structural analyses Damping Foundation Stability Analysis Shear keys, lift lines & contraction joints Validated material and damage models Uplift during and after an EQ Silent boundary conditions Spatially varying EQs Displacements of gravity dams – prediction & limits Strengthening concrete dams 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 15

    16. Spillways Gated spillway structures during EQs Hydrodynamic loads on spillway gates Rehab schemes 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 16

    17. Present Small Scale EQ Testing Dynamic excitation tests Lab shake table tests Small scale centrifuge tests Strong motion instruments 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 17

    18. Large Scale EQ Testing Benefits Would allow improved treatment of: Material Properties Mass concrete properties Concrete tensile threshold Constitutive models Fracture, shearing and sliding Embankment wrap-arounds etc Loading Uplift EQ inputs, spatially varying etc Hydrodynamic interaction Damping (from elastic to damage) Radiation damping FEM Validation and benchmark tests using large scale models Dynamic Response 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 18

    19. 9/27/2007 19 U Colorado Boulder Workshop on Dam Safety R&D Needs

    20. Conclusions There is substantial uncertainty in present modeling This is particularly so as we move in Risk Informed decisions where we need to describe behavior to failure Current small scale testing has limitations Large scale testing would offer better validation opportunities 9/27/2007 U Colorado Boulder Workshop on Dam Safety R&D Needs 20

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