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Nicolas Luco USGS (Golden, CO)

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 Luco USGS (Golden, CO). Validation not Verification.

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Nicolas Luco USGS (Golden, CO)

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  1. 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 Luco USGS (Golden, CO)

  2. Validation not Verification Verification = comparison against theoretical predictions vs. Validation = comparison against observations 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

  3. GMSV TAG • 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 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

  4. GMSV TAG • 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. 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

  5. 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

  6. SEISM Project Validation Efforts • 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 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

  7. Validation Gauntlets • 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) • IunioIervolino – buildings (NRHA, with FarzinZareian) • Automation of gauntlets will be led by FarzinZareian. • Since they will be developed collaboratively, “apples-to-apples” comparisons of ratings from gauntlets can be made. 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

  8. … SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call

  9. Validation Gauntlet for Nonlinear Response History Analysis (NRHA) of Buildings SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call Nicolas Luco for … IunioIervolino UniversitadegliStudi di Napoli Federico II & FarzinZareian University of California, Irvine

  10. 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

  11. 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

  12. 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 Recordings Simulations Source: Baker

  14. Selected simulations and recordings Recordings Simulations Source: Baker

  15. Sample Engineering Models – MDOF - Inelastic • EDPs: • Story Drift • Floor Acc. 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

  16. Sample Comparison Metrics – MDOF - Inelastic

  17. Sample Comparison Metrics – MDOF - Inelastic

  18. … SCEC Software Environment for Integrated Seismic Modeling (SEISM) Project Coordination Call

  19. 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 … FarzinZareian University of California, Irvine

  20. Current Technological Setting. • Steps to run one set of validation exercise: • Login to broadband platform and order simulation ASCII files (velocity time-history) at location of actual recordings from previous events. • Download velocity history files to local machine. • Differentiate and rotate velocity files to coincide with the direction of recorded ground motions on local machine. • 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). • Comparison of results using validation metrics.

  21. Proposed Research. • Facilitate ground motion validation exercise through automating the effort at the following levels: • No need to download the wave forms. Validation can be exercised on the platform. • Tools for differentiation and rotation of simulation will run on the platform. • 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. • Post-processing of the results and comparison of results using validation metrics that will be made available on the broadband platform .

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