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

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland 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

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland The study area: Iceland

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland The study area: South Iceland Seismic Zone 17 June June May 2008

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: PGA

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: PGA Peak resultant acceleration is taken as the rotation-invariant measure of PGA M w 6.3, 2008 Ölfus Earthquake

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Hazard scenario: MMI M w 6.3, 2008 Ölfus Earthquake

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland 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.

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Building vulnerability: Damage Probability Matrix Damage factor (%) Probability of a given damage factor for a given hazard intensity Modified Mercalli Intensity VVIVIIVIIIIX 0***** 0.5***** 5***** 20***** 45***** 80*****

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Building vulnerability: Damage Probability Matrices Damage factor (%) Probability of a given damage factor for a given hazard intensity Modified Mercalli Intensity VVIVIIVIIIIX 0***** 0.5***** 5***** 20***** 45***** 80***** Damage factor (%) Empirical probability distribution function 80 1 MMI VII

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Timber buildings Count: 454 Mean DF: 3.15 % Max DF: 75 % Std DF: 10 %

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Concrete buildings Count: 587 Mean DF: 4.37 % Max DF: 78 % Std DF: 11 %

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI Masonry buildings Count: 97 Mean DF: 8.42 % Max DF: 78 % Std DF: 16 %

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: scenario using MMI MaterialMean DF (%) Std DF (%) Concrete Timer Masonry All4.2611

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors: Using constant MMI 8 and 9 Material Mean DF (%) Variable MMI Constant MMI VIII Constant MMI IX Concrete Timber Masonry All

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Damage factors : Comparison with ATC-13 Material Mean DF (%) PDM model based on Icelandic damage ratio data ATC 13 model Concrete Timber Masonry All

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland 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 M w 6.3, 2008 Ölfus Earthquake

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UPStrat-MAFA 3 rd General Meeting July 2013, Selfoss, Iceland Thank You !

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