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

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


The study area: Iceland


The study area: South Iceland Seismic Zone

17 June 200021 June 2000

29 May 2008


Hazard scenario: PGA


Hazard scenario: PGA

Peak resultant acceleration is taken as the rotation-invariant measure of PGA

Mw 6.3, 2008 Ölfus Earthquake


Hazard scenario: MMI

Mw 6.3, 2008 Ölfus Earthquake


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.


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 * * * * *


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

1

MMI VII


Damage factors: scenario using MMI

Timber buildings• Count: 454• Mean DF: 3.15 %• Max DF: 75 %• Std DF: 10 %



Concrete buildings• Count: 587• Mean DF: 4.37 %• Max DF: 78 %• Std DF: 11 %



Masonry buildings• Count: 97• Mean DF: 8.42 %• Max DF: 78 %• Std DF: 16 %



Material Mean DF (%)

Std DF (%)

Concrete 4.37 11

Timer 3.15 10

Masonry 8.42 16

All 4.26 11


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


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


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


Thank You !

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

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