Instrumentation, monitoring, and modeling of the I-35W bridge.

Details

• Creators:
  French, Catherine E.W. ; Shield, Carol K. ; Stolarski, Henryk K. ; Hedegaard, Brock D. ; Jilk, Ben J.
• Corporate Creators:
  University of Minnesota. Dept. of Civil Engineering
• Subject/TRT Terms:
  • Highway bridges
  • Instrumentation
  • Monitoring
  • Sensors
  • Finite element method
  • Load tests
  • Bridge design
  • Performance measurement
• Publication/ Report Number:
  MN/RC 2012-24
• Resource Type:
  Tech Report
• Geographical Coverage:
  Minnesota
• Corporate Publisher:
  Minnesota. Dept. of Transportation. Research Services Section
• Abstract:
  The new I-35W Bridge was instrumented incorporating "smart bridge technology" by Figg Engineering Group in ; conjunction with Flatiron-Manson. The purpose of the instrumentation was to monitor the structure during service, ; and to use this information to investigate the design and performance of the bridge. Instrumentation included static ; sensors (vibrating wire strain gages, resistive strain gages and thermistors in the foundation, bridge piers, and ; superstructure, as well as fiber optic sensors and string potentiometers in the superstructure) and dynamic sensors ; (accelerometers in the superstructure). Finite element models were constructed, taking into account measured ; material properties, to further explore the behavior of the bridge. The bridge was tested using static and dynamic ; truck load tests, which were used, along with continually collected ambient data under changing environmental ; conditions, to validate the finite element models. These models were applied to gain a better understanding of the ; structural behavior, and to evaluate the design assumptions presented in the Load Rating Manual for the structure. ; This report documents the bridge instrumentation scheme, the material testing, finite element model construction ; methodology, the methodology and results of the truck tests, validation of the models with respect to gravity loads ; and thermal effects, measured and modeled dynamic modal characteristics of the structure, and documentation of ; the investigated assumptions from the Load Rating Manual. It was found that the models accurately recreated the ; response from the instrumented bridge, and that the bridge had behaved as expected during the monitoring period.
  More +
• Format:
  PDF
• Funding:
  (C) 89261 (WO) 131
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26074/dot_26074_DS1.pdf
• File Type:
  [PDF - 35.20 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f476efb4e194afc35909157484d7483a40e94088ace458253faaf7e1e621c50711ae1396feb22d00ee57c451e9ceed1f0fa85663b1b0e5cbf7ea1b4f19df789b