End region detailing of pretensioned concrete bridge girders.

Details

• Creators:
  Hamilton, H.R. ; Consolazio, Gary R. ; Ross, Brandon E.
• Corporate Creators:
  University of Florida. Dept. of Civil and Coastal Engineering
• Subject/TRT Terms:
  • Prestressed concrete
  • Girders
  • Serviceability
  • Bridge design
  • Pretensioning
  • Shear strength
  • Reinforcement (Engineering)
  • Load tests
  • Finite element method
• Publication/ Report Number:
  UF Project No. 00072910 ; UF Project No. 00074016
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
• Abstract:
  End region detailing has significant effect on the serviceability, behavior, and capacity of pretensioned concrete girders. ; In this project, experimental and analytical research programs were conducted to evaluate and quantify the effects of ; different end region detailing schemes. Two end region design models were developed using results from the experimental ; and analytical programs. The first model can be used to design confinement reinforcement to prevent lateral-splitting failure ; at ultimate strength. The second model focuses on serviceability criteria and can be used to calculate bottom flange stresses ; due to prestressing and thereby assess the likelihood of bottom flange cracking in the end region. ; The experimental program was conducted using (14) Florida I-Beam (FIB) specimens. Cracking and strain data were ; collected during prestress transfer and during the months following transfer. These data were used to evaluate serviceability ; criteria. Following serviceability evaluations, specimens were load tested to determine capacity and behavior due to applied ; loads. Specimens were loaded in three-point bending at a shear-span-to-depth (a/d) ratio of approximately 2.0. Variables ; considered in the experimental work included confinement reinforcement, steel bearing plates, horizontal reinforcement, ; vertical reinforcement, strand quantity, strand shielding, and strand layout. ; The analytical program was conducted using finite element analysis (FEA). FEA models were validated using data from ; the experimental program. Variables considered in the analytical program included bearing pad geometry, bearing pad ; stiffness, steel bearing plates, transfer length, and prestress release sequence. ; A test program was also conducted to evaluate the shear strength of 1950s era pretension girders used in the Florida ; highway system. These girders are of interest because they have thin 4 in. webs and very little specified shear ; reinforcement. Six test girders were removed from an existing bridge and were tested to failure in the laboratory. Results ; from the testing will be useful in determining the shear strength of similar pretensioned girders. ; Recommendations are provided with regard to detailing of confinement reinforcement, embedded bearing plates, strand ; shielding, and crack control. Recommendations are also given regarding evaluation of early pretensioned girders.
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• Format:
  PDF
• Alternate URL:
  http://ntl.bts.gov/lib/47000/47400/47429/FDOT-BDK75-977-05-rpt-A.pdf ; http://ntl.bts.gov/lib/47000/47400/47430/FDOT-BDK75-977-05-rpt-B.pdf ; http://ntl.bts.gov/lib/47000/47400/47431/FDOT-BDK75-977-05-rpt-C.pdf ; http://ntl.bts.gov/lib/47000/47400/47432/FDOT-BDK75-977-05-rpt-D.pdf ; http://ntl.bts.gov/lib/47000/47400/47433/FDOT-BDK75-977-05-rpt-E.pdf ; http://ntl.bts.gov/lib/47000/47400/47434/FDOT-BDK75-977-05-rpt-F.pdf ; http://ntl.bts.gov/lib/47000/47400/47435/FDOT-BDK75-977-05-rpt-G.pdf ; http://ntl.bts.gov/lib/47000/47400/47436/FDOT-BDK75-977-05-rpt-H.pdf
• Funding:
  BDK75 977-05
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25872/dot_25872_DS1.pdf
• File Type:
  [PDF - 2.65 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:689e567d46f8eb17b9a56bffc1945d9068c9cfba7d50c55651cd0dbec1d0cfe0bea40ebcfb338dde62548c1f180b70684bd14af63df08fc37e2fdf4289b617f4