EERI Seminar on Next Generation Attenuation Models
Role of SCEC Ground Motion Simulation Validation Technical Activity Group
(GMSV TAG) in SEISM Project
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
Nicolas LucoUSGS (Golden, CO)
EERI Seminar on Next Generation Attenuation Models
Validation not Verification
Verification = comparison against theoretical predictions
vs.
Validation = comparison against observations
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
EERI Seminar on Next Generation Attenuation Models
GMSV TAG
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
• Focused on validation in terms of “engineering metrics,” such as …– elastic response spectra (of SDoF oscillators)– inelastic response spectra (“)– multi-degree-of-freedom (MDoF) building response– response of geotechnical systems
… not just
EERI Seminar on Next Generation Attenuation Models
GMSV TAG
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
• Established to develop and implement, via collaboration between ground motion modelers and engineering users, testing/rating methodologies for simulated ground motions to be used in engineering applications.
• To date, TAG research has consisted of independently-proposed projects by individual PI’s, in response to general GMSV priorities in the SCEC Collaboration Plan.
• The SCEC Broadband Platform Validation Project is a separate effort, but it was initiated at one of the bi-annual GMSV TAG workshops and is coordinated with the TAG.
• The validation efforts of the SEISM project were proposed by, and will be conducted by, the GMSV TAG.
EERI Seminar on Next Generation Attenuation Models
SEISM Project Proposal
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
EERI Seminar on Next Generation Attenuation Models
SEISM Project Validation Efforts
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
• Development of “validation gauntlets” for the use of simulated ground motions in 2 building code applications: nonlinear response history analysis (NRHA) of buildings, i.e.,
building response simulations site response analysis (SRA), i.e., near-surface soil response
simulations
• Development of parallel validation gauntlets for … inelastic single-degree-of-freedom oscillators other geotechnical systems (?) bridges (?)
• Automation of validation gauntlets via an interface to a NRHA and SRA software framework called OpenSees
EERI Seminar on Next Generation Attenuation Models
Validation Gauntlets
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Role of SCEC GMSV TAG in SEISM Project,” N. Luco (USGS) April 11, 2013
• Each gauntlet will consist of one or more tests of the structural/ geotechnical analysis results for simulated ground motions against those for recorded ground motions.
• Development of each gauntlet will be led by …
Jack Baker – inelastic single-degree-of-freedom oscillators Jonathan Stewart – geotechnical systems (including SRA) Iunio Iervolino – buildings (NRHA, with Farzin Zareian)
• Automation of gauntlets will be led by Farzin Zareian.
• Since they will be developed collaboratively, “apples-to-apples” comparisons of ratings from gauntlets can be made.
EERI Seminar on Next Generation Attenuation Models
…
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
EERI Seminar on Next Generation Attenuation Models
Validation Gauntlet for Nonlinear Response History Analysis
(NRHA) of Buildings
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
Nicolas Luco for …
Iunio IervolinoUniversita degli Studi di Napoli Federico II
&Farzin Zareian
University of California, Irvine
EERI Seminar on Next Generation Attenuation Models
U.S. Building Code (“ASCE 7-10”)
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Validation Gauntlet for NRHA of Buildings,” N. Luco (USGS) for I. Iervolino (Naples) & F. Zareian (UCI) April 11, 2013
EERI Seminar on Next Generation Attenuation Models
U.S. Building Code (“ASCE 7-10”)
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Validation Gauntlet for NRHA of Buildings,” N. Luco (USGS) for I. Iervolino (Naples) & F. Zareian (UCI) April 11, 2013
EERI Seminar on Next Generation Attenuation Models
U.S. Building Code (“ASCE 7-10”)
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
“Validation Gauntlet for NRHA of Buildings,” N. Luco (USGS) for I. Iervolino (Naples) & F. Zareian (UCI) April 11, 2013
13
Selected simulations and recordings
SimulationsRecordings
Source: Baker
14
Selected simulations and recordings
SimulationsRecordings
Source: Baker
Sample Engineering Models – MDOF - Inelastic
Zareian F., Lignos D.G., Krawinkler H. 2010. Evaluation of seismic collapse performance of steel Special Moment Resisting Frames using FEMA P695 (ATC-63) Methodology. 2010 ASCE Structures Congress, Paper ID: 1275
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3@20’
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8-Story
2-Story 12-Story -Story
Plan View - All Frames
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EDPs:
Story Drift
Floor Acc.
Sample Comparison Metrics – MDOF - Inelastic
Sample Comparison Metrics – MDOF - Inelastic
EERI Seminar on Next Generation Attenuation Models
…
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
EERI Seminar on Next Generation Attenuation Models
Automation of Validation Gauntlets via interface with Open System for Earthquake
Engineering Simulations (OpenSees)
SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call
Nicolas Luco for …
Farzin ZareianUniversity of California, Irvine
Steps to run one set of validation exercise:
1. Login to broadband platform and order simulation ASCII files (velocity time-history) at location of actual recordings from previous events.
2. Download velocity history files to local machine.
3. Differentiate and rotate velocity files to coincide with the direction of recorded ground motions on local machine.
4. Run the waveforms from step3 into variety validation modules: 1) at waveform level, 2) at engineering intensity measures (SDOF elastic & inelastic), and 3) at engineering decision making parameters (MDOF elastic & inelastic).
5. Comparison of results using validation metrics.
Current Technological Setting.
Facilitate ground motion validation exercise through automating the effort at the following levels:
1. No need to download the wave forms. Validation can be exercised on the platform.
2. Tools for differentiation and rotation of simulation will run on the platform.
3. Set of Parametric Models will be provided through which users can run sets of motions for validation at the three levels described before. i.e., waveform parameters, SDOF & MDOF with elastic & inelastic behavior.
4. Post-processing of the results and comparison of results using validation metrics that will be made available on the broadband platform .
Proposed Research.