seismic analysis capabilities supporting doe and nnsa missions
TRANSCRIPT
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Seismic Analysis Capabilities Supporting DOE and NNSA Missions
David McCallenLawrence Berkeley National Laboratory
& University of Nevada, Reno
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DOE/NNSA own many mission-critical facilities in regions of high seismic hazard
DOE Labs/Sites
Savannah River Los Alamos Livermore Y-12
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DOE seismic considerations span from older legacy facilities to new modern facilities
Enabling performance-baseddesign of new facilities
Beyond design basismargin assessments forexisting/legacy facilities
ForceLevel
Drift
Original DesignBasis (linear elastic)
Updated Hazard(acceptable inelastic
behavior?)
ForceLevel
Drift
Response level undersmall earthquakes Response level under
rare large earthquakes
Uranium Processing Facility - Y12Canyon facility - Savannah River
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The 1980 Livermore earthquake was a defining event for the DOE complex
Extensive disruption
- Extensive building damaged- Program laser system damaged- Complete loss of site electrical power- Extensive disruption of facilities - No strong motion instruments on-site- Initiated a decade+ seismic upgrade
program
M = 5.8 event
12 miles
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This event helped initiate DOE leadership in risk-informed, performance-based standards
For many DOEfacilities SSIis important
1980’s
Bob KennedyBob Murray (LLNL)
Jim Hill (DOE)
Today
Mike SalmonASCE 4
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Robust simulation capabilities are essential to fully realize performance-based design
Incident motions (1D)
Soil Structure
ShearModulus
Damping
greference
Soil StructureLower order system models
High fidelity system models
Incident motions (3D)
Traditional Linear
Nonlinear
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The National Labs have often brought advanced simulations to seismic issues
National Lab Strategic Partnership Projects
National Ignition Facility
Yucca Mountain
Morrow Point
SF Bay Bridge
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Three components of an LBNL DOE project supporting simulation code capabilities
3) Testing and utilization of computational models
Displacement-controlled pushover
1) An experimental capability for validation
2) Implement new capabilities for nonlinear analysis of both soils and structures
Nonlinear soils
Pd
0.03 0.02 0.030.010Disp. Ratio [-]
0.01 0.02
Nonlinear structures
Nonlinear systemanalysis
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An expert panel to provide feedback along the way
NAE NAE NAE
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Enhancements to an HPC code for nonlinear analysis of structures and soils
Start with stronggeo-mechanics
and robustnonlinear algorithms
Combined with advancednonlinear structuralelement technology
To model fully coupledsoil-structure systems
MSESSI
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120 inches lengthW 14 x 159 cross section
σ
ε
36,000 psi Ey =E/5
9 m
9 m
9 m
9 m
4 m
4 m
4 m
120 inches lengthW 14 x 159 cross section
σ
ε
36,000 psi Ey =E/5
-200 -100 0 100 200-20
-15
-10
-5
0
5
10
15
20
Displacement [mm]
Forc
e [k
N]
ESSIOpenSees
Element Level Comparisons System Level Comparisons
Steel
Concrete
Testing, verification & validation of nonlinear capabilities
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For validation of structural elements we collected existing data from all sources
RCColumns
RCShear Walls
Tall
Medium Squat
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Nonlinear concrete shear walls(Fiber layer membrane element)
Slender Medium Low (Squat)
Displacement-controlled pushover Displacement-controlled pushover Displacement-controlled pushover
“A versatile numerical model for the nonlinear analysisof squat-to-tall reinforced concrete shear walls”
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Active code development efforts are now under the DOE Exascale Computing Project
Regional-scaledomain
Geophysics ground motionsimulations
(billions of zones)
Infrastructure response simulations
(thousands of stations)
Infrastructuredemand / risk
Geophysics Engineering
Weak Coupling Strong Coupling
PEER Pacific Rim forum June 16-17
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Fully coupled ground motion – structure simulations (SSI + complex incident waves)
9 billion zone SW4 geophysics wave propagation model
Faultparallel
Faultnormal
Fault normal displacement, velocity and acceleration
OpenSees nonlinearbuilding/soil model
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Early conceptualization of the Large Scale Laminar Soil Box (LLSB)
• Drive nonlinear soil response• Make it as big as practical
- Representative soil confinement- More realistic structural models(no rigid bodies!)
Field
Laboratory
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Completing a major design effort -from cartoon to detailed design
21.5 ft.
15 ft.
Concept
FinalDesign
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The platen is complete and assembled, fit-up was exceptional and very flat
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Laminar Soil Box fabrication
Steel Tubes
RubberBearings
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Soil box construction
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Soil box completed
408Bearings
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Bearing plate precision leveling check
Laser level
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Reaction blocks, actuators and bearings/bearing plates
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The final phase of construction - hydraulics
“Down in the basement”
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Next
• Commissioning- Comprehensive testing of all systems and system
performance validation
• Ready for Experiments - New insight into nonlinear site response
- Data for confronting site response and SSI simulations