scec workshop on earthquake ground motion simulation and validation development of an integrated...
TRANSCRIPT
SCEC Workshop on Earthquake Ground Motion Simulation and Validation
Development of an Integrated Ground Motion Simulation
Validation Program
Development of an Integrated Ground Motion Simulation Validation Program
Proposition:
Ground Motion simulation validation must vary by intended engineering use of simulations.
Development of an Integrated Ground Motion Simulation Validation Program
Proposition:
We have two validation gauntlets defined
(1)SWUS
Application: Estimate of strong ground motions near a stiff concrete structure
(2)NGA-E
Application: Develop GMPE for region with very limited observations
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BroadBand Platform Validation: Motivation and objective
Motivation
SCR: NGA-East • Short term goal: supplement data for development of hazard models (SWUS, NGA-East)
• Long term goal: develop acceptance of simulations in engineering applications
Key focus: 5% damped elastic “average” PSA (f=0.1-100 Hz/ T=0.01-10 s) Correlates well with structural response – basis of design “Aggregates” complex ground motions into a simple
parameter
Development of an Integrated Ground Motion Simulation Validation Program
SWUS:
Multiple methods, common input definition, methods allowed regional configuration
1D velocity models
Common output processing
Common output evaluations
Part A:
Selection of observed records
Correction of record to “rock” conditions
Comparison of amplitudes only
Ensemble of valiation earthquakes with fixed fault, mag, and hypocenter, that differ by slip distribution
Development of an Integrated Ground Motion Simulation Validation Program
Part B:
Ensemble of scenario earthquakes at well recorded magnitude and distance.
Vary earthquake hypocenter and slip distribution
Comparison of amplitudes to GMPE.
Define simulation median must fall within GMPE bands.
Development of an Integrated Ground Motion Simulation Validation Program
How does this “gauntlet” need to change for:
(1)GMS used in Evaluation of dams
(2)GMS used in Evaluation of tall buildings
(3)GMS used in calculating hazard curves
Development of an Integrated Ground Motion Simulation Validation Program
What are the scientific hurdles to using simulations?• Validation (median ground motions)
– for realistic representation of• Crustal models (3D)• Realistic fault planes (not a single plane)• Plasticity, especially near fault• Site effects, including nonlinearity
– for other ground motion parameters, including time domain metrics
• Unclear range of captured aleatory variability and epistemic uncertainty– Calibrate variability within existing
methods: define range of input params/output GMs
– Include more methods/models
Development of an Integrated Ground Motion Simulation Validation Program
Proposal:
Use the BBP platform to isolate and test the sensitivity of ground motion simulation to various parameters.Techniques should be evaluated prior to use on broad impact applications like power plants, dams, and tall buildings, and hazard curves.
Evaluate impact of 3D simulations in BBP
Evaluate impact of 3D simulations in BBP