Rational load rating of deck-girder bridges with girder end shear cracks in reverse orientation.

Details

• Creators:
  Bernica, Andrew ; Rasheed, Hayder
• Corporate Creators:
  Kansas State University. Transportation Center
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Research
• Subject/TRT Terms:
  • Concrete bridges
  • Plate girder bridges
  • Girder bridges
  • Cracking
  • Load factor
  • Girders
  • Ratings
  • Load Rating
  • Reverse Diagonal Shear Cracking
  • Deck-Girder Bridges
• Publication/ Report Number:
  Report No. K-TRAN: KSU-15-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas ; United States
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Research
• Abstract:
  Reverse diagonal shear cracking at reinforced concrete girder supports affects many low-volume bridges built ; in the early 1900s in Kansas. This phenomenon, however, is not addressed in the American Association of State ; Highway and Transportation Officials (AASHTO, 2002) Standard Specifications for Highway Bridges or American ; Concrete Institute specifications. This study investigates causes of this cracking and develops Bridge Rating of ; Inclined Damage at Girder Ends (BRIDGE), an Excel-based software, to determine load rating of a user-specified ; bridge with reverse diagonal shear cracking at girder supports. A user interface creates a grillage model of an existing ; bridge and places various rating trucks on the bridge. Equivalent flexibility analysis distributes truck live loads within ; deck panels to surrounding girders and diaphragms. Stiffness matrices are utilized to find nodal displacements and ; reactions at the girder supports caused by truck live loads and bridge dead load. These reactions are checked against ; RISA software models to test the accuracy of the stiffness matrix application. ABAQUS FE models and Mohr’s circle ; stress distribution determine driving and clamping forces on the crack due to resolution of dead and live load reactions ; and friction force generated between the concrete girder and rusty steel bearing pad along the shear crack orientation. ; In addition to the simplified modified compression field theory, these clamping and driving forces are used to ; determine the shear capacity of each girder at the reverse cracks. A modified version of Equation 6B.4.1 from the ; Manual for Bridge Evaluation (AASHTO, 2011) is used to find operating and inventory rating factors (RFs) for the ; bridge. ; The BRIDGE program, used to load rate Bridge No. 54-104-15.45, yielded reasonable RFs for various trucks ; and reduced girder widths. The operating RFs were consistently above 1 and the inventory RFs were below 1, ; indicating that the decision to load post this bridge is based on the engineer’s judgment.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32231/dot_32231_DS1.pdf
• File Type:
  [PDF - 2.29 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7f81e2cb222f42eaa8aa1626b57d914a8da9debc07849c53545153be1dc5ab0f