Project 3.16: CT Bridge Girder Sections with Precast Decks and FRP Girder-Deck Shear Connectors

Details

• Creators:
  Clark, Jacob ; Schanck, Andrew ; Davids, William
• Corporate Creators:
  University of Maine. Transportation Infrastructure Durability Center (TIDC)
• Corporate Contributors:
  United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  Bridge Decks Composite Structures CT Girder Fatigue Tests Fiber Reinforced Concrete Fiber Reinforced Polymers Girder Bridges Girders Shear Reinforcement Shear Tests Static Loads Strength Of Materials

  More +
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  University of Maine. Transportation Infrastructure Durability Center (TIDC)
• Abstract:
  The University of Maine’s composite tub (CT) girder, also known as the “GBeam”, is a hybrid FRP composite bridge girder system that is a direct replacement for steel and concrete as the main structural members for short-to-medium span bridges. In continuing to develop this technology, this report describes fatigue and strength testing of a novel FRP shear connector and fatigue testing of a full girder section. Shear push-out specimens were subjected to up to 6 million fatigue load cycles and surviving specimens were then subjected to static loading to failure. Of the five specimens, only two were able to withstand the full fatigue loading regiment, and the other three failing prematurely. The surviving specimens displayed reductions in strength up to 35% relative to previously tested specimens with stainless steel shear connectors at much lower stiffness. Two, full-scale CT girder specimens were tested to assess whether bottom flange ply-drops (reductions in the number of layers of fabric reinforcement at a particular, discrete location) are a fatigue critical detail. The first girder was tested in four-point bending to failure in its virgin state to establish base-line strength and stiffness values. Then, a second girder was tested 4-point bending in fatigue for 3 million cycles of high applied load before also being statically tested to failure. After fatiguing, the second specimen retained 67% of the initial girder’s strength, indicating damage had occurred. However, the ply-drops did not fail, suggesting that this detail is acceptable if properly fabricated.
• Format:
  PDF
• Funding:
  69A3551847101
• Collection(s):
  University Transportation Centers
• Main Document Checksum:
  urn:sha-512:be5b4c6c980e04f6d8f271571b51f22b0ecfc03e1778ccd68354f435f7f51e2a240c11e00869e81d6e07a20ae6171ec6d6f76f7e10efe2dfd67ce7841b7395fb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88854/dot_88854_DS1.pdf
• File Type:
  [PDF - 5.28 MB ]