earthquake damage to residential buildings in south iceland
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Earthquake damage to residential buildings in South Iceland
Rajesh RupakhetyRagnar Sigbjörnsson
UPStrat-MAFA 3rd General Meeting 23-26 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
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
The study area: Iceland
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
The study area: South Iceland Seismic Zone
17 June 200021 June 2000
29 May 2008
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Hazard scenario: PGA
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Hazard scenario: PGA
Peak resultant acceleration is taken as the rotation-invariant measure of PGA
Mw 6.3, 2008 Ölfus Earthquake
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Hazard scenario: MMI
Mw 6.3, 2008 Ölfus Earthquake
UPStrat-MAFA 3rd General Meeting 23-26 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.
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Building vulnerability: Damage Probability Matrix
Damage factor
(%)
Probability of a given damage factor for a given hazard intensity
Modified Mercalli IntensityV VI VII VIII IX
0 * * * * *0.5 * * * * *5 * * * * *
20 * * * * *45 * * * * *80 * * * * *
UPStrat-MAFA 3rd General Meeting 23-26 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
V VI VII VIII IX
0 * * * * *
0.5 * * * * *
5 * * * * *
20 * * * * *
45 * * * * *
80 * * * * *
Damage factor (%)
Empi
rical
pro
babi
lity
dist
ributi
on fu
nctio
n
80
1MMI VII
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors: scenario using MMI
Timber buildings• Count: 454• Mean DF: 3.15 %• Max DF: 75 %• Std DF: 10 %
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors: scenario using MMI
Concrete buildings• Count: 587• Mean DF: 4.37 %• Max DF: 78 %• Std DF: 11 %
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors: scenario using MMI
Masonry buildings• Count: 97• Mean DF: 8.42 %• Max DF: 78 %• Std DF: 16 %
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors: scenario using MMI
Material Mean DF (%)
Std DF (%)
Concrete 4.37 11
Timer 3.15 10
Masonry 8.42 16
All 4.26 11
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors: Using constant MMI 8 and 9
MaterialMean DF (%)
Variable MMI
Constant MMI VIII
Constant MMI IX
Concrete 4.37 8.46 14.58
Timber 3.15 4.53 9.75
Masonry 8.42 24.13 22.03
All 4.26 7.72 13.54
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Damage factors : Comparison with ATC-13
Material
Mean DF (%)
PDM modelbased on Icelandicdamage ratio data
ATC 13 model
Concrete 4.37 4.70
Timber 3.15 3.83
Masonry 8.42 7.85
All 4.26 4.64
UPStrat-MAFA 3rd General Meeting 23-26 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 Mw 6.3, 2008 Ölfus Earthquake
UPStrat-MAFA 3rd General Meeting 23-26 July 2013, Selfoss, Iceland
Thank You !