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Interreg IIIB: SISMOVALP WP6: Generic alpine ground motion

Interreg IIIB: SISMOVALP WP6: Generic alpine ground motion. A 2D Simulation benchmark for the study of the seismic response of alpine valley. Sismovalp Meeting, Martigny, Switzerland, October 2-4. Participants to the 2D Benchmark. Geometry of the valley. W = 4050 m H = 450 m

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Interreg IIIB: SISMOVALP WP6: Generic alpine ground motion

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  1. Interreg IIIB: SISMOVALP WP6: Generic alpine ground motion A 2D Simulation benchmark for the study of the seismic response of alpine valley Sismovalp Meeting, Martigny, Switzerland, October 2-4

  2. Participants to the 2D Benchmark

  3. Geometry of the valley W = 4050 m H = 450 m Shape ratio: H/(0.5*W)= 0.22

  4. 2D benchmark

  5. Synthetic seismograms

  6. Synthetic seismograms Computed at the two reference receivers for simulation 2 They represent the input motion, to some extent Left side Right side

  7. Response Spectrum Spectra Ratios (RSSR) Angle=0 LGIT POLIMI INOGS ETH UNITN

  8. Response Spectrum Spectra Ratios (RSSR) Angle=30 LGIT POLIMI INOGS ETH UNITS UNITN

  9. Response Spectrum Spectral Ratios (RSSR) Different models and incidence angles

  10. Response Spectrum Spectral Ratios (RSSR) Different models and incidence angles

  11. Response Spectrum Spectral Ratios (RSSR) Different models and incidence angles

  12. Response Spectrum Spectral Ratios (RSSR) Variation (%) due to incidence angle

  13. Response Spectrum Spectral Ratios (RSSR) Comparison of the methods for simulations 1 and 2

  14. Response Spectrum Spectral Ratios (RSSR) Comparison of the methods for simulations 2 and 3

  15. 1D transfer function (Wavenumber Integration Method, Herrmann, 2004) Angle=0 Angle=-30

  16. Source time function LGIT POLIMI INOGS ETH UNITS UNITN

  17. 2D transfer functions LGIT POLIMI INOGS ETH UNITN No attenuation

  18. 2D vs. 1D transfer functions 1 2 3 1 2 3

  19. 2D transfer functions Simulation 1 Simulation 2 Simulation 3 LGIT POLIMI INOGS ETH 1 2 3 1 2 3

  20. Aggravation Factor LGIT POLIMI INOGS ETH UNITN No attenuation Aggravation Factor = SA2D / SA1D u1D = STF * TF1D

  21. Aggravation Factor

  22. Aggravation Factor

  23. 2D Benchmark • Status • All synthetics have been computed. • Results have been analysed; • Conclusions are presently under discussion; • A scientific report will be delivered within the final report; • A paper will be prepared.

  24. 2D Benchmark – Preliminary conclusions In this benchmark, both valley shape and 1D reference layering were held fixed. The valley shape-ratio is mainly 1D.

  25. WP6 – Priority features Priority list of elements which must be investigated in order to assess the seismic response of an alpine valley:

  26. WP6 – Priority features Priority list of elements which must be investigated in order to assess the seismic response of an alpine valley:

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