Seismic performance of quasi-isolated highway bridges in Illinois.

Details

• Creators:
  LaFave, James ; Fahnestock, Larry ; Foutch, Douglas ; Steelman, Joshua ; Revell, Jessica ; Filipov, Evgueni ; Hajjar, Jerome
• Corporate Creators:
  Illinois Center for Transportation ; University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Seismicity
  • Earthquake resistant design
  • Highway bridges
  • Bridge bearings
  • Base isolation
  • Bridge design
  • Finite element method
  • Dislocation (Geology)
• Publication/ Report Number:
  FHWA-ICT-13-015
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois. Dept. of Transportation. Bureau of Materials and Physical Research
• Abstract:
  The Illinois Department of Transportation (IDOT) commonly uses elastomeric bearings to accommodate ; thermal deformations in bridges, and these bearings have potential utility in seismic events. IDOT has developed ; an Earthquake Resisting System (ERS) using the displacement capacity of typical bearings to achieve a ; structural response similar to isolation. Project R27-70 was conducted to validate and calibrate the quasi-isolated ; ERS based on full-scale laboratory tests of bearings and computational models capturing full-bridge seismic ; response. The overall report is divided into two volumes. Volume 1 discussed the experimental program. This ; second volume focuses on the analytical program but also contains retainer design recommendations. Results ; from the experimental testing program were used to develop constitutive bearing models, which were ; incorporated into the finite element model of a three-span bridge with simply supported abutments and fixed ; bearings at one pier. A suite of 48 bridges was created to represent the most common highway bridge ; configurations in Illinois. Variables included superstructure type, pier type, pier height, elastomeric bearing type, ; and foundation flexibility. Two sets of ten synthetic ground motions from the New Madrid Seismic Zone were ; scaled to match the AASHTO seismic design spectra for Cairo, Illinois, and applied in the longitudinal and ; transverse directions. A total of 12,000 nonlinear dynamic analyses were conducted in OpenSees at six scale ; factors from 0.5 to 1.75 and used to create coarse incremental dynamic analyses. On the basis of the findings of ; the parametric study, most bridges in Illinois would not experience severe damage during a 75-year design life, ; and bearing unseating or span loss are not likely to occur in regions with moderate seismic hazard. Piers with ; fixed bearings commonly yielded for small earthquakes, but future calibration of fuse capacities may improve this ; behavior.
  More +
• Format:
  PDF
• Funding:
  UILU-ENG-2013-2019
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27275/dot_27275_DS1.pdf
• File Type:
  [PDF - 6.88 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:6be25b1a1f505d0ab39be2815344b324ef25480f2b681dc19ce9fbc3ba5202b54e051bca6a9ebfc57808cc345170d5207822f28f10a49013aff0469bd6f03ea2