1 / 19

Field Testing & Monitoring of Structural Performance

George E. Brown, Jr. Network for Earthquake Engineering Simulation. Field Testing & Monitoring of Structural Performance. John W. Wallace Joel P. Conte Deborah Estrin Patrick J. Fox Jonathan P. Stewart Daniel Whang. University of California, Los Angeles 7 NCEE July 21-24, 2002.

oona
Download Presentation

Field Testing & Monitoring of Structural Performance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. George E. Brown, Jr. Network for Earthquake Engineering Simulation Field Testing & Monitoringof Structural Performance John W. Wallace Joel P. Conte Deborah Estrin Patrick J. Fox Jonathan P. Stewart Daniel Whang University of California, Los Angeles 7 NCEE July 21-24, 2002

  2. Acknowledgements • Funding provided through a cooperative agreement with the National Science Foundation George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) • Dr. Priscilla P. Nelson, Director Division of Civil and Mechanical Systems • Joy Pauschke, Ph.D., P.E., NEES Program Director • Thomas L. Anderson, Ph.D. NEES Equipment Project Coordinator

  3. UCLA NEES Personnel • Daniel Whang (Project Manager) • PhD, UCLA, 2001 • Geotechnical • Eunjong Yu • (Graduate Student Researcher) • William Elmer • (Engineering Aide) • Colin Means • (Engineering Aide) • Balaji Vasu (Webmaster) • John W. Wallace (PI) • PhD, UC Berkeley, 1989 • Structural • Joel P. Conte (co-PI) • PhD, UC Berkeley, 1990 • Structural • Jonathan Stewart (co-PI) • PhD, UC Berkeley, 1996 • Geotechnical • Patrick J. Fox (co-PI) • PhD, University of Wisconsin- • Madison 1992, Geotechnical • Deborah Estrin (co-PI) • PhD, MIT, 1985 • Computer Science

  4. Wireless Project Overview

  5. State-of-the-art data acquisition system w/ wireless capabilities Networking equipment to enable near real-time field connectivity to NEESgrid Forced vibration equipment (shakers) Cone penetration truck for rapid soil characterization Structural sensors for acceleration, strain, displacement Custom soil probes for measuring ground vibrations Equipment Overview

  6. Data Acquisition System • Vendor: Kinemetrics, Inc. • True 24-bit resolution/large dynamic bandwidth (155 dB) • Quanterra Q330 data loggers are true network devices with wireless capabilities (TCP/IP) • Powerful UNIX based data acquisition software program, Antelope • Remote monitoring • Relational database embedded

  7. Local Area Network • Sensors/Video • Data acquisition system/video server • Satellite • Campus gigabit backbone • NEESpop • Visualization portal • NEESgrid

  8. Eccentric Mass Shakers • MK-14A (1): • Omni-directional • 0 to 4.2 Hz • 20 kips peak force • MK-15 (2): • Uni-directional • 0 to 25 Hz • 100 kips peak force • Can be synchronized • MK-14B (1): • Omni-directional • 0 to 10 Hz • 50 kips peak force • Rapidly deployable (assembly time < 4 man hours)

  9. Actuator Mass Linear Inertial Shaker • “Shake Table” • Mass on rails, Actuator • 30 gpm HPS, Accumulators • Digital control system • Mounting requirements • Table with Actuator support • System Limitations • Ms (weight) – 1 to 7 kips • Actuator (+/- 15 inches) • Force (15,000 pounds) • Advantages • Random load history • Time domain analysis

  10. Cone Penetration Truck • Vendor: Hogentogler, Inc • Site characterization • Installation of soil probes to measure ground vibrations during forced vibration tests of full-scale structures

  11. Cable Drive shoe Probe Triaxial accelerometer Custom Soil Probes • Deployable/retrievable • Triaxial (3 channels) • Measure in situ ground accelerations • Feed directly to Q330 data loggers

  12. Research Vision • Obtain detailed performance data for linear and nonlinear response of structural systems • Address scale and boundary conditions issues commonly associated with lab studies • Provide data to study system interactions, e.g. SFSI • Develop new sensor (packaging) concepts • Obtain high resolution response data to promote advances in simulation Shaker To Command Center Data Collection Point Soil Probes

  13. Equipment Integration • Pilot Study #1 • Data acquisition • Pilot Study #2 • Laboratory testing • Shakers, sensors, data acquisition • Pilot Study #3 • Field testing • Soil probes (final) • Satellite system

  14. Pilot Study #2 • SDOF steel frame • 15 ft (L) x 13 ft (H) x 6 ft (W) • Structure weight ~3.6 kips • Free-vibration testing • Forced-vibration testing • Shaker weight ~ 5 kips • Longitudinal direction • Acceleration sensors • Strain sensors

  15. Basic System Identification

  16. Satellite Link UCLA Trailer Field LAN for Pilot Study #2 • Instruments: Episensors, pulser • Real-time Wireless transmission of data from data logger in UCLA structural laboratory to UCLA NEES Office • Real-time transmission of data from webserver in UCLA NEES Office to outside world via Antelope • Mock run (at UCLA) of real operation scenario in the field

  17. Pilot Study #3 • PS #2 specimen on alternative foundation configurations • Investigate effect on SFSI • Shaking in transverse direction • Dense instrumentation on structure, ground surface and subsurface

  18. Tele-observable Data Streams • Excitation response history • Recorded response histories at sensors • Deck/foundation transfer functions (fixed base) • Deck/foundation transfer functions (flexible base)

  19. Website – http://cee.ucla.edu/nees/

More Related