NEESgrid Demonstration Projecton Geotechnical Centrifuges

J. P. Bardet

December 7, 2000

University of Southern California

Participants to Centrifuge Demonstration

•Bruce Kutter, UC Davis, NEES centrifuge grantee

•Ahmed W. Elgamal, UC San Diego, numerical simulation

•Carl Kesselman, ISI, system architecture

•Tom Finholt, University of Michigan, web interface

•J. P. Bardet, USC, coordinator

Objectives of Centrifuge Demonstration

Demonstrate through a real life videoconferencing the applicability of some major concepts of NEESgrid. side-by-side visualization of experiment and

simulation data over the Internet

real-time remote simulation

collaborative videoconferencing environment.

Scheduled at NCSA on March 15, 2001.

Duration is 50 to 55 minutes.

Contributions to Centrifuge Demonstration

UC Davis Existing data set on centrifuge experiment (200 MB) and a comprehensive report on the web: http://cgm.engr.ucdavis.edu/research/projects/dks/index.html

UC Berkeley

Computational platform OPENSEES originally developed by Greg Fenves in the framework of PEER research: http://opensees.berkeley.edu

UCSD Input and output data for OPENSEES numerical simulations

CREW Adapted version of the SPARC collaborative web interface to visualize data from experiment and simulation.

ANL Adapted version of its video-conferencing/ web-interface tools

NSCAISI

Network support, computational environment, and possibly additional visualization tools

Parties Involved in Centrifuge Demonstration

N S F re v iew p an e l

N E S gr id tea mB a rd e tF inh o ltK e s s e lm a n

E xp er im e n ta lis tK u tte r

S im u la to rE lg a m a l

P o lyc o m P o lyc o m

D e s k to p D e s k to p

Agenda of Centrifuge Demonstration

1. Introduction (5-10 min)

2. Experiment, and visualization (10-15 min)

3. Simulation and interaction between experimentalist and simulator (10-15 min)

4. Conclusion (5 min)

5. Questions and Answers (10 min)

Part 1: Introduction

• Bardet introduces the overall intention of the centrifuge demonstration project, underlining its relevance as a proof of concept to the overall NEESgrid project.

• The plot of the action is an interactive work session between Kutter, the experimentalist who has performed a series of centrifuges, and Elgamal, the simulator who is about to simulate numerically the centrifuge experimental results.

• Kutter and Elgamal are introduced.

Part 2: Experiment, visualization and interaction with modeler

Bruce Kutter summarizes the main objectives and methods used in the centrifuge data sets. The selected centrifuge experiment simulates the response of a soil layer shaken at its base by several earthquakes of different types, magnitudes and durations

Part 2: Experiment, visualization and interaction with modeler

Bruce explains the problem geometry and boundary conditions

Part 2: Experiment, visualization and interaction with modeler

Bruce displays over the Internet his experimental results using his own visualization tools

Part 2: Experiment, visualization and interaction with modeler

Bruce displays his experimental results using NEESgrid visualization tools using advanced graphic interactive display

Part 2: Experiment, visualization and interaction with modeler

Bruce displays his experimental results using NEESgrid visualization toolsand interacts with Ahmed using advanced video/voice/graphic interactive display

Part 3: Remote simulation, visualization, and interaction with experimentalist

Elgamal briefly reviews the computational platform OPENSEES, a simulation tool developed by PEER researchers.

Part 3: Remote simulation, visualization, and interaction with experimentalist

Elgamal explains its assumption in defining the simulation input data, and runs the code OPENSEES a few times for different earthquake motions, displays some results, and discusses his findings with Kutter using the NEESgrid interfaces.

Experiment

Simulation

Part 3: Remote simulation, visualization, and interaction with experimentalist

Model

Observed

Common time axis

The experiments and simulation results are compared side by side. This comparison includes time histories of acceleration and displacement at several points in the model (CREW).

Part 3: Remote simulation, visualization, and interaction with experimentalist

SPARC examples of advanced visualization of two-dimensional fields (CREW).

Part 4: Conclusion

• Tom Finholt describes how the existing web visualization/ video conferencing tools were adapted for the demonstration project

• Carl Kesselman explains how OPENSEES was rendered more efficient using parallel computations.

Part 4: Conclusion

• Kesselman goes over the relations between the centrifuge demonstration project, and the proposed global NEESgrid architecture, i.e.,

1. side-by-side visualization of experiment and simulation data over the Internet

2. real-time remote simulation

3. collaborative videoconferencing environment.• Bardet concludes on how NEESGrid has taken an existing

simulation-experiment situation in earthquake engineering, and has enhanced it through better communication and information dissemination between researchers.