Analyze Shear Capacity of Texas Standard Prestressed Beams from Strut-and-Tie Models of Beam Ends: Final Report

Details

• Creators:
  Jang, Hansol ; Webb, Zach ; Choi, Jongkwon ; Wang, Hwa-Ching ; Bayrak, Oguzhan
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Beams Bridge Design End Region Girders Prestressed Concrete Shear Stress Stress Flow Strut And Tie Method
• Publication/ Report Number:
  FHWA/TX-21/0-7015-1, 0-7015-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Edition:
  Technical Report, July 2019 – October 2021
• Corporate Publisher:
  University of Texas at Austin. Center for Transportation Research
• Abstract:
  The shear stress limit in girder end regions as established in the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications might be overly conservative for Texas standard prestressed beams. This report confirms that the shear stress limit of Texas standard prestressed beams could be relaxed using the Strut-and-Tie Model (STM) and anchorage capacity at the end region. Additionally, it confirms that additional expected failures depending on the type of beams, such as nodal failure, horizontal shear failure, and lateral splitting failure, are prevented when the shear stress at the end of the girder is greater than the currently used 0.18 f’c shear stress limit. The geometry and strand layout of the girder used by Texas Department of Transportation (TxDOT) is used to calculate the maximum shear stress limit of the girder in this paper. Some but not all Texas standard prestressed beams can relax the shear stress limit, but the relaxed shear stress limit is different according to the type and size of the beams. Therefore, it is more economical to set the shear stress limit of the end region according to each girder's geometry and design manual.
• Format:
  PDF
• Funding:
  0-7015
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2ca7a35f546441bc8d4dcb123ffa445a4dbb6d8811bede9c0090d203dbd8541c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/60861/dot_60861_DS1.pdf
• File Type:
  [PDF - 5.89 MB ]