View
220
Download
2
Category
Preview:
Citation preview
Motivation Real ESSI for Performance-Based Design Summary
Nonlinear Simulations for Soil-StructureInteraction and Performance-Based Design
Boris Jeremic
University of California, DavisLawrence Berkeley National Laboratory, Berkeley
A University of California Pacific Rim ForumThe Earthquake Resilience of Nuclear Facilities
Berkeley, CA. June, 2015
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Outline
Motivation
Real ESSI for Performance-Based DesignInelastic Modeling6D Seismic Motions
Summary
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Introduction
MotivationI Improve seismic design of soil structure systems
I Earthquake Soil Structure Interaction (ESSI) in time andspace, plays a decisive role in successes and failures
I Accurate following and directing (!) the flow of seismicenergy in ESSI system to optimize for
I Safety andI Economy
I High fidelity numerical modeling and simulation tool toanalyze realistic ESSI behavior: The Real ESSI Simulator( aka: Vrlo Prosto, Muy Fácil, Molto Facile, ,
, Πραγματικά Εύκολο, , Très Facile,Vistinski Lesno, Wirklich Einfach)
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Introduction
Modeling and Parametric UncertaintyI Modeling uncertainty: (unrealistic) modeling simplifications
for important featuresI Inelastic material: soil, rock, concrete, steel; Contacts,
foundation–soil, dry, saturated slip–gap; Nonlinear buoyantforces; Isolators, Dissipators
I Seismic Motions: 6D, inclined, body and surface waves(translations, rotations); Incoherency
I Parametric Uncertainty:
5 10 15 20 25 30 35
5000
10000
15000
20000
25000
30000
SPT N Value
You
ng’s
Mod
ulus
, E (
kPa)
E = (101.125*19.3) N 0.63
−10000 0 10000
0.00002
0.00004
0.00006
0.00008
Residual (w.r.t Mean) Young’s Modulus (kPa)
Nor
mal
ized
Fre
quen
cy
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Introduction
Predictive Capabilities
I Verification: provides evidence that the model is solvedcorrectly. Mathematics issue. Well developed (for the RealESSI Simulator).
I Validation: provides evidence that the correct model issolved. Physics issue. Work in progress, a new US-DOEproject.
I Prediction: use of computational model to foretell the stateof a physical system under consideration under conditionsfor which the computational model has not been validated.
I Goal is to predict and inform, not diagnose or fit.
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Inelastic Modeling
Outline
Motivation
Real ESSI for Performance-Based DesignInelastic Modeling6D Seismic Motions
Summary
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Inelastic Modeling
Real ESSI Models
I Full (6D) seismic motion input (body and surface waves)
I Inelastic (saturated or dry) soil/rock
I Inelastic (saturated or dry) contact (foundation – soil/rock)
I Buoyant (nonlinear) forces
I Inelastic structural modeling
I Verification (extensive) and Validation (in progress)
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Inelastic Modeling
Inelastic Contact, Base Slip and Gap
0 0 2 4 6 8 10 12
Time (s)
0 0 2 4 6 8 10 12
Time (s)
-40
-20
0
20
40
0 1 2 3 4 5 6 7 8
Acc
eler
atio
n (m
/s2)
Time (s)
Slip BehaviorNo-slip Behavior
-40
-20
0
20
40
0 1 2 3 4 5 6 7 8
Acc
eler
atio
n (m
/s2)
Time (s)
Slip BehaviorNo-slip Behavior
-40
-20
0
20
40
0 1 2 3 4 5 6 7 8
Acc
eler
atio
n (m
/s2)
Time (s)
Slip BehaviorNo-slip Behavior
-40
-20
0
20
40
0 1 2 3 4 5 6 7 8
Acc
eler
atio
n (m
/s2)
Time (s)
Slip BehaviorNo-slip Behavior
top X top Z bottom X bottom Z
4.5s 4.6s 4.7s 4.8s
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110Y
(m
)
0
0.005
0.01
0.015
0.02
0.025
0.03
4.9s 5.0s 5.1s 5.2s
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
30 40 50 60 70 80 90 100 110
X (m)
30
40
50
60
70
80
90
100
110
Y (
m)
0
0.005
0.01
0.015
0.02
0.025
0.03
0
500
1000
1500
2000
2500
3000
3500
0 1 2 3 4 5 6 7 8
Ene
rgy
(kJ)
Time (s)
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Inelastic Modeling
Uncertain Inelastic Wave Propagation
I Probabilistic Elasto-Plasticity
I Stochastic Elastic-PlasticFinite Element Method
0 0.0108 0.0216 0.0324 0.0432 0.0540
0.00005
0.0001
0.00015
0.0002
0.00025
0.0003
Stre
ss (
MPa
)
Strain (%)
Mode
DeterministicSolutionStd. Deviations
Mean
−400
0
200400
0
0.02
0.04
0.06
5
10
15
20
Tim
e (s
ec)
Displacement (mm)
−200
−1000 −500 500 1000
0.0005
0.001
0.0015
0.002
0.0025
Displacement (mm)
Real Soil Data
Conservative Guess
−1000 −500 500 1000
0.2
0.4
0.6
0.8
1
CD
F
Displacement (mm)
Real Soil DataConservative Guess
Pro
bab
ilit
y o
f E
xce
edan
ceo
f 5
0 c
m (
%)
Time (s)
Conservative Guess
Real Site
Characterized SiteExcellently
80
60
40
20
05 10 15 20 250
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
6D Seismic Motions
Outline
Motivation
Real ESSI for Performance-Based DesignInelastic Modeling6D Seismic Motions
Summary
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
6D Seismic Motions
6D Motions: Free Field
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
6D Seismic Motions
From 6D to 1D?I Record a full 6D (3D) motions in one horizontal directionI Develop a vertically propagating shear wave in 1DI Apply 1D vertically propagating shear wave
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
6D Seismic Motions
6D and 1D: Free Field
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
6D Seismic Motions
6D vs 1D: NPP ESSI Response
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Summary
New 5 Year U.S. DOE Project
I Development of advanced computational tools formodeling and simulating the earthquake response ofnuclear facilities
I Enhance understanding of the expected levels of damage,and margins against failure, for critical facilities subjectedto earthquake ground motions
I Project Team:I Dr. David McCallen (Project Leader), UCOP and LBNLI Prof. Ian Buckle (Validation Experiments), UNRI Prof. Boris Jeremic (Code development), UCD and LBNL
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Summary
Concluding RemarksI High fidelity numerical modeling and simulation (inelastic,
time domain) used to reduce modeling uncertainty
I Parametric uncertainty needs to be taken into account
I Goal is to predict and inform, not fit or diagnose
I Change state of practice (and research)
I Education (designers, regulators, owners, &c.) is essential
Jeremic
Real ESSI for Performance-Based Design
Motivation Real ESSI for Performance-Based Design Summary
Summary
Acknowledgement
I Funding from and collaboration with the US-NRC,US-DOE, US-NSF, CNSC, Shimizu Corp., and AREVA NPGmbH is greatly appreciated,
I Collaborators: Dr. McCallen (UCOP and LBNL), Prof.Buckle (UNR), Dr. Kammerer (UCB/PEER), Dr. Budnitz(LBNL), Prof. Kavvas (UCD), Prof. Sett (UB), Mr. Orbovic(CNSC) Prof. Pisanò (TU Delft), Mr. Watanabe (Shimizu),Mr. Vlaski (AREVA NP GmbH), and UCD students: Mr.Abell, Mr. Karapiperis, Mr. Feng, Mr. Sinha, Mr. Luo
Jeremic
Real ESSI for Performance-Based Design
Recommended