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Earthquake damage to residential buildings in South Iceland

Earthquake damage to residential buildings in South Iceland. Rajesh Rupakhety Ragnar Sigbjörnsson. Contents. The study area : Hveragerði Hazard scenario: Peak Ground Acceleartion Hazard scenario: Modified Mercalli Intensity (MMI) Building vulnerability : Damage Probability Matrices

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Earthquake damage to residential buildings in South Iceland

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  1. Earthquake damage to residential buildings in South Iceland Rajesh Rupakhety Ragnar Sigbjörnsson

  2. Contents • The study area : Hveragerði • Hazard scenario: Peak Ground Acceleartion • Hazard scenario: Modified Mercalli Intensity (MMI) • Building vulnerability : Damage Probability Matrices • Damage factors: Spatially variable MMI • Damage factors: Constant MMI • Damage factors: ATC-13 DPM • Summary

  3. The study area: Iceland

  4. The study area: South Iceland Seismic Zone 29 May 2008 17 June 2000 21 June 2000

  5. Hazard scenario: PGA

  6. Hazard scenario: PGA Mw 6.3, 2008 Ölfus Earthquake Peak resultant acceleration is taken as the rotation-invariant measure of PGA

  7. Hazard scenario: MMI Mw 6.3, 2008 Ölfus Earthquake

  8. Building vulnerability: Damage data Vulnerability Study of the South-Iceland Lowland Based on Data from the 2000 Earthquakes - Sólveig Thorvaldsdóttir, Rainrace for the 6th framework EU project FORESIGHT.

  9. Building vulnerability: Damage Probability Matrix

  10. Building vulnerability: Damage Probability Matrices MMI VII 1 Empirical probability distribution function 80 Damage factor (%)

  11. Damage factors: scenario using MMI • Timber buildings • Count: 454 • Mean DF: 3.15 % • Max DF: 75 % • Std DF: 10 %

  12. Damage factors: scenario using MMI • Concrete buildings • Count: 587 • Mean DF: 4.37 % • Max DF: 78 % • Std DF: 11 %

  13. Damage factors: scenario using MMI • Masonry buildings • Count: 97 • Mean DF: 8.42 % • Max DF: 78 % • Std DF: 16 %

  14. Damage factors: scenario using MMI

  15. Damage factors: Using constant MMI 8 and 9

  16. Damage factors : Comparison with ATC-13

  17. Summary • Timber buildings show the best performance with a mean damage factor of 3.15 % • The simulation results show that the concrete buildings suffer a damage factor of 4.37 % on average • Masonry buildings show the worst performance with a mean damage factor of 8.42 % • ATC 33 damage probability matrices gave similar results as those obtained from damage data in South Iceland • Considering just one value of intensity for the whole town of Hverageði over-estimates the damage factor, almost by a factor of 2 • Consideration of spatial variability of ground motion intensity gave results close to the actual damage observed after the Mw 6.3, 2008 Ölfus Earthquake

  18. Thank You !

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