2013 Coordination Workshop

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Organizers: Nico Luco and C.B. Crouse
Date: Wednesday, April 3, 2013 (GMSV Workshop 08:00-15:00 | UGMS Meeting 15:00-17:00)
Location: SCEC Boardroom, University of Southern California, Los Angeles, CA
Participants: 33 total

Background & Objectives

The SCEC Ground Motion Simulation Validation (GMSV) Technical Activity Group (TAG) focuses on developing and implementing, via collaboration between ground motion modelers and engineering users, testing/rating methodologies for the use of ground motion simulations in engineering applications.

The two main purposes of this small workshop are 1) to coordinate the 2013 GMSV TAG projects with their 2012 counterparts and other related SCEC projects, namely the Software Environment for Integrated Seismic Modeling (SEISM) project, the Broadband Platform Validation Project, and the Committee for Utilization of Ground Motion Simulations (UGMS); and 2) to discuss a plan for future GMSV TAG projects.

The workshop will be followed by a two-hour meeting of the aforementioned UGMS committee, chaired by C.B. Crouse. The UGMS is initiating a pilot study with the objective of using 3-D numerical simulations, together with traditional empirical approaches, to develop long period ground motion maps for Los Angeles. These maps eventually may be introduced in a future edition of the NEHRP seismic provisions. Consequently, the UGMS committee consists of both seismologists and structural engineers.

Agenda

08:00 - 08:05 Welcome and overview of SCEC validation efforts T. Jordan
08:05 - 08:15 Overview of agenda N. Luco

2012 GMSV TAG Projects
08:15 - 08:30 Spectral correlations, polarization, and near-fault pulses in simulated ground motions J. Baker
08:30 - 08:45 Validation of broadband ground-motion synthetics using earthquake engineering-relevant metrics K. Olsen
08:45 - 09:00 US-Japan collaboration on strong ground motion prediction techniques P. Somerville
09:00 - 09:15 Behavior of multiple broadband ground motion simulation techniques for a suite of earthquake scenarios using multiple rupture model generators on the SCEC Broadband Platform J. Bayless
09:15 - 09:30 PBR science for SCEC4: Validation of ground motion prediction and simulations G. Biasi
09:30 - 09:45 Discussion All

09:45 - 10:00 Break

Broadband Platform Validation Project
10:00 - 10:15 Update on validation plans C. Goulet
10:15 - 10:30 Update on simulation plans P. Somerville
10:30 - 11:00 Discussion All

Software Environment for Integrated Seismic Modeling (SEISM) Project
11:00 - 11:10 GMSV using single-degree-of-freedom (SDoF) oscillators J. Baker
11:10 - 11:20 GMSV for geotechnical systems J. Stewart
11:20 - 11:30 GMSV for multi-degree-of-freedom (MDoF) nonlinear building systems N. Luco for I. Iervolino
11:30 - 11:40 SEISM-OpenSees interface S. Rezaeian for F. Zareian
11:40 - 12:10 Discussion All

12:10 - 13:00 Lunch

2013 GMSV TAG Projects
13:00 - 13:15 Validating nonlinear site response prediction methodologies for SCEC broadband ground motion simulations D. Asimaki
13:15 - 13:30 Simulation and validation of long-period earthquake ground motion in the Kanto Basin in Japan J. Bielak
13:30 - 13:45 Discussion All

Future GMSV TAG Efforts
13:45 - 13:50 Committee for utilization of ground motion simulations (UGMS) C.B. Crouse
13:50 - 14:00 Simulated ground motions for building code response history analysis? N. Luco
14:00 - 14:50 Discussion All
14:50 - 15:00 Summary of discussion N. Luco
15:00 - 15:10 Adjourn GMSV TAG Workshop & Break

Committee for Utilization of Ground Motion Simulations (UGMS) Meeting
15:10 - 15:15 Call to order & introductions of attendees C.B. Crouse
15:15 - 15:20 Introductory remarks & project motivation T. Jordan
15:20 - 15:35 Pilot project objectives and technical approach C. Crouse
15:35 - 15:50 Questions & discussion All
15:50 - 16:00 Project schedule C. Crouse
16:00 - 16:30 Discussion of technical & non-technical issues All
16:30 - 16:45 Project organization & coordination C. Crouse & All
16:45 - 16:50 Action items & assignments All
16:50 - 16:55 New members & next meeting All
16:55 - 17:00 Closure & adjourn T. Jordan

Participants

Attending In-Person: Norm Abrahamson (PG&E/UC Berkeley), Dominic Asimaki (Georgia Tech), Bob Bachman (Engineering Consultant), Jack Baker (Stanford), Jeff Bayless (URS), Glenn Biasi (UNR), Jacobo Bielak (CMU), CB Crouse (URS), Greg Deierlein (Stanford), Christine Goulet (UC Berkeley), Rob Graves (USGS), Tran Huynh (USC/SCEC), Tom Jordan (USC/SCEC), Nicolas Luco (USGS), Phil Maechling (USC/SCEC), Kim Olsen (SDSU), Sanaz Rezaeian (USGS), Andreas Skarlatoudis (URS), Paul Somerville (URS), Jon Stewart (UCLA), Ricardo Taborda (CMU), Feng Wang (USC)

Attending Remotely: Brad Aagard (USGS), Jared DeBock (CU Boulder), Carola Di Alessandro (GeoPentech), Art Frankel (USGS), Carmine Galasso (AIR), Ron Hamburger (SGH), Steve Hartzell (USGS), Abbie Liel (CU Boulder), Morgan Moschetti (USGS), Ellen Rathje (UT), Farzin Zareian (UCI)

Unable to Attend: John Anderson (UNR), Ralph Archuleta (UCSB), Greg Beroza (Stanford), Brendon Bradley (Canterbury), Jorge Crempien (UCSB), Steve Day (SDSU), Curt Haselton (Chico State), John Hooper (MKA), Iunio Iervolino (UNINA), Charlie Kircher (Kircher & Associates), Farzad Naeim (John A Martin), Mark Petersen (USGS)

Committee for the Utilization of Ground Motion Simulations: Norm Abrahamson (PG&E), John Anderson (UNR), Bob Bachman (Engineering Consultant), Jack Baker (Stanford), Jacobo Bielak (CMU), C.B. Crouse (URS), Art Frankel (USGS), Rob Graves (USGS), Ron Hamburger (SGH), Curt Haselton (CSU Chico), John Hooper (MKA), Charlie Kircher (Kircher & Associates), Nico Luco (USGS), Farzad Naeim (John A Martin), Mark Petersen (USGS), and Paul Somerville (URS).

Summary of Outcomes

  • The validation efforts of the SEISM project can be thought of as development of validation "gauntlets" of ground motion simulation tests for 1) inelastic SDoF oscillators, 2) geotechnical systems, and 3) nonlinear MDoF buildings.
  • All of the validation gauntlets will be developed and demonstrated using the simulated ground motion time series from the Broadband Platform Validation Project that will be available in June (2013). As explained in a bullet below, the validation gauntlets will be automated in order to facilitate tests of future/other ground motion simulations.
  • The principal engineering applications for which the validation gauntlets will be developed are nonlinear response history analysis (NRHA) of MDoF buildings and nonlinear site response analysis (SRA) in building codes. Note that the Broadband Platform Validation Project is currently focused on the use of ground motion simulations in developing the median part of ground motion prediction equations for elastic spectral acceleration.
  • In addition to SRA, parallel validation gauntlets for the use of simulated ground motions in geotechnical analysis of slope displacements and/or liquefaction might be developed.
  • In addition to NRHA of buildings, a parallel validation gauntlet might be developed for NHRA of bridges.
  • Mainly to compare against the results of the other validation gauntlets, a parallel gauntlet will also be developed for inelastic SDoF oscillator responses.
  • The first of two types of tests in each validation gauntlet will compare the geotechnical or structural analysis responses to the simulated ground motions against those to recorded ground motions that have substantially similar response spectra (elastic or inelastic). This type of validation test will isolate any discrepancies between the simulated and recorded ground motions beyond those in response spectra. They can also serve as tests of the use of simulated ground motions from an archive/database for building code NRHA and SRA applications. Currently, recorded ground motions selected from a database and scaled/modified to approximately match a target elastic response spectrum are, for the most part, used in these applications.
  • The second type of validation test in each gauntlet will compare against the geotechnical or structural analysis responses to recorded ground motions from corresponding historical earthquake and station locations. This type of test will convolve any discrepancies in the response spectra of the simulated and recorded ground motions with any discrepancies isolated in the preceding bullet. Note that for these validation tests the simulated ground motion time series from the Broadband Platform Validation Project, or their recorded counterparts, will need to be adjusted for the site profile at each station location.
  • In the validation gauntlet for inelastic SDoF oscillator responses, a third test against existing ground motion prediction equations (e.g., Tothong & Cornell, 2006) will be included.
  • As mentioned in a bullet above, the validation gauntlets will be automated in the Broadband Platform in order to facilitate tests of future ground motion simulations. Part of this automation will be the computation of the geotechnical and structural analysis responses, which will be accomplished via a user-friendly interface to the OpenSees (Open System for Earthquake Engineering Simulations) software framework. The OpenSees interface will also facilitate running other simulated ground motions (not necessarily from the Broadband Platform) through the developed validation gauntlets.