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Network for Earthquake Engineering Simulation

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File:WildLifeTest2010.jpg
The 32-ton triaxial T-Rex shaker of NEES at the University of Texas

The George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) was created by the National Science Foundation (NSF) to improve infrastructure design and construction practices to prevent or minimize damage during an earthquake or tsunami. Its headquarters are based at Purdue University in West Lafayette, Indiana as part of cooperative agreement #CMMI-0927178. The mission of NEES is to accelerate improvements in seismic design and performance by serving as a collaboratory for discovery and innovation.

The NEES network features 14 geographically distributed, shared-use laboratories that support several types of experimental work: geotechnical centrifuge research, shake table tests, large-scale structural testing, tsunami wave basin experiments, and field site research. Participating universities include: Cornell University; Lehigh University;Oregon State University; Rensselaer Polytechnic Institute; University at Buffalo, SUNY; University of California, Berkeley; University of California, Davis; University of California, Los Angeles; University of California, San Diego; University of California, Santa Barbara; University of Illinois at Urbana-Champaign; University of Minnesota; University of Nevada, Reno; and the University of Texas, Austin.

Placing the wind turbine on the NEES@UCSD table.

The equipment sites (labs) and a central data repository are connected to the global earthquake engineering community via the NEEShub[1], which is powered by the HUBzero software developed at Purdue University specifically to help the scientific community share resources and collaborate. The cyberinfrastructure, connected via Internet2, provides interactive simulation tools, a simulation tool development area, a curated central data repository, animated presentations, user support, telepresence, mechanism for uploading and sharing resources and statistics about users, and usage patterns.

This cyberinfrastructure allows researchers to: securely store, organize and share data within a standardized framework in a central location called the Project Warehouse; remotely observe and participate in experiments through the use of synchronized real-time data and video; collaborate with colleagues to facilitate the planning, performance, analysis, and publication of research experiments; and conduct computational and hybrid simulations that may combine the results of multiple distributed experiments and link physical experiments with computer simulations to enable the investigation of overall system performance. The cyberinfrastructure supports analytical simulations using the OpenSees software.[2]

These resources jointly provide the means for collaboration and discovery to improve the seismic design and performance of civil and mechanical infrastructure systems.

What is Cyberinfrastructure?

Cyberinfrastructure is an infrastructure based on computer networks and application-specific software, tools, and data repositories that support research in a particular discipline. The term "cyberinfrastructure" was coined by the National Science Foundation to answer the question: how can NSF, as the nation's premier agency funding basic research, remove existing barriers to the rapid evolution of high performance computing, making it truly usable by all the nation's scientists and engineers?

Research Projects

NEES Research covers a wide range of topics including performance of existing and new construction, energy dissipation and base isolation systems, innovative materials,[3] lifeline systems such as pipelines, piping,[4] and bridges, and nonstructural systems such a ceilings and cladding[5]. Researchers are also investigation soil remediation technologies[6] for liquefiable soils, and collecting information about tsunami impacts and building performance after recent earthquakes. The permanently instrumented field sites operated by NEES@UCSB support field observations of ground motions, ground deformations, pore pressure response, and soil-foundation-structure interaction.[7]

The NEESwood project[8] investigated the design of low and mid-rise woodframe construction in seismic regions. The NEES@UCLA mobile field laboratory, consisting of large mobile shakers, field-deployable monitoring instrumentation systems, was utilized to collect forced and ambient vibration data from a four-story reinforced concrete (RC) building damaged in the 1994 Northridge earthquake.[9] Shake table tests on pipe systems anchored in a full-scale, seven-story building performed on the Large High-Performance Outdoor Shake Table at NEES@UCSD investigated seismic design methods for anchors fastening nonstructural components.[10]

References

  1. ^ Hacker, T. J., Eigenmann, R., Bagchi, S., Irfanoglu, A., Pujol, S., Catlin, A., & Rathje, E. (2011). The neeshub cyberinfrastructure for earthquake engineering. Computing in Science & Engineering, 13(4), 67-78. DOI: 10.1109/MCSE.2011.70
  2. ^ McKenna, F. (2011). OpenSees: A Framework for Earthquake Engineering Simulation, Computing in Science & Engineering, 13:4, pp 58 - 66. DOI:10.1109/MCSE.2011.66
  3. ^ Noguez, C., and Saiidi, M. (2012). Shake-Table Studies of a Four-Span Bridge Model with Advanced Materials. J. Struct. Eng., 138(2), 183–192. doi: http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000457
  4. ^ Zaghi, A.E., Maragakis, E. M., Itani, A., Goodwin, A. E. (2012). Experimental and Analytical Studies of Hospital Piping Assemblies Subjected to Seismic Loading. Earthquake Spectra: Vol. 28, No. 1, pp. 367-384. doi: http://dx.doi.org/10.1193/1.3672911
  5. ^ Hutchinson, T. C., Nastase, D., Kuester, F., & Doerr, K. (2010). Vibration Studies of Nonstructural Components and Systems Within a Full-Scale Building. Earthquake Spectra, 26(2), 327-347. doi: http://dx.doi.org/10.1193/1.3372168
  6. ^ Howell, R., Rathje, E., Kamai, R., and Boulanger, R. (2012). ”Centrifuge Modeling of Prefabricated Vertical Drains for Liquefaction Remediation.” J. Geotech. Geoenviron. Eng., 138(3), 262–271. doi: 10.1061/(ASCE)GT.1943-5606.0000604
  7. ^ Steidl, J., Nigbor, R.L., and Youd, T. L. (2008). Observations of Insitu Soil Behavior and Soil-Foundation-Structure-Interaction Infrastructure at the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES)Permanently Instrumented Field Sites, 14th World Conference on Earthquake Engineering, Beijing,http://www.iitk.ac.in/nicee/wcee/article/14_S16-01-014.PDF
  8. ^ NSF, Standing Strong, The 2009 NEESwood Capstone Test, http://www.nsf.gov/news/newsmedia/neeswood/.
  9. ^ Yu, E., Skolnik, D., Whang, D. H., and Wallace, J. W. (2008). Forced Vibration Testing of a Four-Story Reinforced Concrete Building Utilizing the nees@UCLA Mobile Field Laboratory, Earthquake Spectra, 24:4 pp. 969-995 doi: http://dx.doi.org/10.1193/1.2991300
  10. ^ Hoehler, M. S., Panagiotou, M., Restrepo, J. I., Silva, J. F., Floriani, L., Bourgund, U. and Gassner, H. (2009). Performance of Suspended Pipes and Their Anchorages During Shake Table Testing of a Seven-Story Building. Earthquake Spectra: Vol. 25, No. 1, pp. 71-91
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