1145-Fajfar Trst 2011
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Transcript of 1145-Fajfar Trst 2011
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SEISMIC HAZARD ANALYSIS OFIMPORTANT STRUCTURES IN SLOVENIA
Peter Fajfar
30. Convegno Nazionale, Trieste, 16. November 2011
Institute of StructuralEngineering, EarthquakeEngineering and Construction IT
University of Ljubljana Faculty of Civil and GeodeticEngineering
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Scope
Important structures according to EC8
NPP Krko
Some problems related to seismic hazard analysis
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Eurocode 8 in Slovenia
2005 Official implementation Paralell use2008 Mandatory use
According to the National Annex, special groundinvestigations are required for all important structures(Importance classes III and IV)
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Seismic hazard map
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Acceleration spectra
0,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0
T [s]
P S A [ g ]
475
1000
2000
EC8 - A
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Importance factors
T 50 100 200 475 1000 10000
I 0,48 0,60 0,76 1,00 1,31 2,57
I 0.8 1.0 1.2 1.3 1.4 T 230 475 780 980 1250
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Soil factor
SPEKTRI POSPEKATermoelektrarna otanj, lokacija 3 - UHA,UHF,UMA
0
0.1
0.20.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 0.5 1 1.5 2Nihajni as [s]
S a
[ g ]
vhodni spekter
spekter na -3m
spekter na -10m
FAKTOR TALTermoelektrarna otanj, lokacija 3 - UHA,UHF,UMA
0
0.5
1
1.5
2
2.5
0 0.5 1 1.5 2
Nihajni as [s]
S a
( i z r a
u n a n i ) / S
a ( v h o
d n
i )
-3m
-10m
MAKSIMALNI POSPEKI / GLOBINATermoelektrarna otanj, lokacija 3 - UHA,UHF,UMA
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0 5 10 15 20 25
Globina [m]
a [ g ]
SHAKE program
Acceleration spectraSoil factor
Maximum acceleration / depth
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Idealized soil factor
IDEALIZIRANI FAKTOR TALTermoelektrarna otanj, lokacija 3 - UHA,UHF,UMA
0
0.5
1
1.5
2
2.5
0 0.5 1 1.5 2
Nihajni as [s]
S a
( i z r a u n a n i ) / S
a ( v h o
d n i ) -3m
-10m
T[s] 0 0.05 0.1 0.2 0.25 0.6 2
FT 1.3 1.3 1.6 1.6 1.3 1 1-3m
T[s] 0 2FT 1 1
-10m
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NPP Krko
Design PGASSE = 0.3 g, PGA OBE = 0.15 g, NRG 1.60 spectrum
Applied at foundation level (up to -20 m)
PSHA 1992-1994PGA = 0.42 g (free field)
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Small local earthquakes
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NPP Krko
Development of revised seismotectonicmodel of Krko basin and update of NPPKrko USAR and PSHA analysis (2002-2004)
Part 1 Development of Revised Seismotectonic Model ofKrko Basin (Geomatrix, USA)
Part 2 Update of Krko USAR (Geomatrix, USA)
Part 3 - Update of PSHA Analysis (University of Ljubljana)
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PSHA 2002-2004
Performed by University of Ljubljana with subcontractors
Environmental Agency of Republic of SloveniaOffice of Seismology,Geological Survey of Slovenia
in cooperation withGeomatrix, USA
University of Zagreb
Reviewed by IRSN, France
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PSHA 2002-2004
Objective: to reevaluate and revise the PSHA to provide the groundmotion inputs for the seismic PSA
Computer programs: FRISK88 and EZ-FRISK 5.6, Risk Engineering, Inc.,
Golden, ColoradoSeismic sources and statements on uncertainty developed by threeindependent earth scientist groups
GeomatrixSloveniaCroatia
Only near regional sources ( 25km) were considered
The methodology was consistent with IAEE Safety guides
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PSHA 2002-2004
GMPEs
Sabetta Pugliese 1987, 1989 Weight 0.60
Boore Joyner Fumal 1997 Weight 0.35
Ambraseys Simpson Bommer 1996 Weight 0.05
PSHA was performed by using SB modelOther GMPEs were taken into account by a period dependentattenuation factor
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NPP Krko
Design PGASSE = 0.3 g, PGA OBE = 0.15 g, NRG 1.60 spectrumApplied at foundation level (up to -20 m)
PSHA 1992-1994PGA = 0.42 g (free field)
PSHA 2002-2004PGA = 0.56 g (free field), PGA = 0.38 g (foundation level)PSA (T=0.3 s) = 1.58 g (free field), PSA (T=0.3 s) = 0.79 g (foundation level)
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PSHA 2002-2004
Increase of seismic hazard compared to PSHA1992/1994 mainly due to
Sources with larger M at smaller R included
Modelling of local soil conditions EPRI shear strain and
damping coefficients used
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PSHA 2002-2004
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Soil factor
ACCELERATION SPECTRAPGA rock = 0.5g
0.00.20.40.60.81.01.21.41.61.8
2.02.22.42.6
0.0 0.5 1.0 1.5 2.0Period [sec]
S A
[ g
]
z=0mz=-20minput
NEK PSHA 2004
RATIO OF ACC. SPECTRA AT - 20m AND INPUT ACC. SPECTRAPGA rock = 0.5g
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.0 0.5 1.0 1.5 2.0
Period [sec]
S A
, s o
i l / S A
, r o c
k
average (basic, EPRI)
proposed
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PSHA 2002-2004
NEK - PSRC 2002Final uniform hazard spectra
Free field - 10,000 years
0,00,20,4
0,60,81,01,21,41,61,82,0
0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 2
T [ s ]
P S A
[ g
]
mean
0,85
0,5
0,15
Group: ALLNEK - PSRC 2002
Final uniform hazard spectraFoundation level - 10,000 years
0,0
0,2
0,4
0,6
0,8
1,0
1,2
0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 2
T [ s ]
P S A
[ g
]
mean
0,85
0,5
0,15
Group: ALL
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Some problems
GMPEs
TruncationGround motion parameter related to damage
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GMPEs
Ground motion prediction equations (GMPEs) have amajor influence on the results of seismic hazardanalyses
Large aleatory and epistemic uncertainties
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Comparison of GMPEs PGA for M=6
Douglas et al., 2008
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Logarithmic versus linear scale
Douglas et al., 2008
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NGA GMPEs
vertical strike-slip earthquake, Vs30 =520 m/sPeru, Fajf ar 2010
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Soil factor
Comparison
NGA (AS, BA, CY) Akkar-Bommer (AB) CAE
Vertical slip faultPeru, Fajfar 2011
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Musson 2009
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Truncation
Bommer et al. 2004
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Acceleration peaks
YIH-MIN WU et al. 2004
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Thank you / Grazie