Shear in high strength concrete bridge girders : technical report.

Details

• Creators:
  Labib, Emad L. ; Dhonde, Hemant B. ; Howser, Rachel ; Mo, Y.L. ; Hsu, Thomas T.C. ; Ayoub, Ashraf
• Corporate Creators:
  University of Houston. Department of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Prestressed concrete
  • Girders
  • Bridge superstructures
  • Compressive strength
  • High strength concrete
  • Shear properties
  • Highway bridges
  • Tendons (Materials)
  • high strength concrete bridge
  • Prestressed concrete
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• Publication/ Report Number:
  FHWA/TX-13/0-6152-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas Department of Transportation. Research and Technology Implementation Office
• Abstract:
  Prestressed Concrete (PC) I-girders are used extensively as the primary superstructure components in Texas highway bridges. ; A simple semi-empirical equation was developed at the University of Houston (UH) to predict the shear strength of PC I-girders ; with normal strength concrete through the project TxDOT 0-4759. The UH-developed equation is a function of shear span to ; effective depth ratio, concrete strength, web area and amount of transverse steel. This report intends to (1) validate the UHdeveloped ; equation for high strength concrete by testing ten 25-feet long full-scale PC I-girders with different concrete strength. ; (2) validate the UH-developed equation for different sizes of PC girders and studying the possibility of having premature failure ; due to local failure in end zone. ; Ten modified Tx28 PC girders were tested for the first objective. The girders were divided into three groups (namely Groups ; A, C and F) based on the concrete compressive strength. Group A consisted of two girders with a concrete compressive strength ; of 7000 psi. Group F had four girders with a concrete compressive strength of 13000 psi and Group C included four girders with ; a compressive strength 16,000 psi. Girders in Group A were designed to have a balanced condition in shear. A pair of girders ; each belonging to Group F and Group C were designed to have a balanced condition while remaining girders were designed as ; over-reinforced sections. Each group of the PC girders was tested with different shear span to effective depth ratio so as to get ; two types of shear failure modes, i.e., web-shear and flexure-shear. The validity of the proposed UH-developed equation was ; ascertained using the girders test results. UH-developed equation was found to accurately predict the ultimate shear strength of ; PC girders having concrete strength up to 17,000 psi with enough ductility. ; Six PC girders of Tx-series with three different sizes were tested for the second objective. The girders were divided into three ; groups (namely Groups D, E and G) based on the girder depth. The test data shows that the PC girders of the new Tx-series has ; no cracks under service loads and can reach the maximum shear capacity without having a shear bond failure. Also, these ; girders’ test results ensured the validity of the UH-developed equations for PC girders with different sizes. ; Simulation of Concrete Structures (SCS), a finite element program recently developed at UH, was used to predict the shear ; behavior of the tested girders. Analytical results presented in this report proved the validity of SCS to predict the behavior of PC ; girders with different concrete strength up to 17,000 psi and with different depth up to 70 inches.
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• Format:
  PDF
• Funding:
  Project 0-6152
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25885/dot_25885_DS1.pdf
• File Type:
  [PDF - 23.42 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:cac0af05e518f51f83bc0a4753b34a6809689913fba95fb8138813e416efe5792ddd2b43e587c392e907bf97e129b50e450724feda7e583a119a79349b4f4ac1