Introducing a New Connection Detail for Connecting Prefabricated Barrier to Concrete Deck Using UHPC

The functionality and crashworthiness of concrete barrier in bridge systems can be affected by the deterioration of the connection between bridge decks and concrete barriers. A new connection detail is introduced to connect prefabricated barriers to bridge decks, where barrier conforms to the provisions of AASHTO TL-4. The detail consists of a recess joint filled with ultra-high performance concrete (UHPC) between prefabricated barriers and the bridge decks. The use of UHPC allows for shorter development length and lap splice length for dowel bars and the material characteristics provide strength and durability to the connection. Besides simplified details, the construction sequence of the proposed connection is suitable for accelerated bridge construction applications. This paper presents findings of nonlinear finite element analyses (NLFEA) which was conducted to investigate the structural performance and failure mode of prefabricated barriers connections and a comparison is drawn with an emulative cast-in-place (CIP) concrete barriers under transverse loadings. The results show that the proposed connection instigates a yield line failure for the critical length of the system. Results of the numerical investigation indicate that the load capacity of the proposed connection could be about 10% more than the corresponding cast-in-place barrier. The dowel bars in the connection region remain under the yield stress and the cracks are limited within the barrier. Based on the results of NLFEA, an experimental program is underway for validating the concept and development of predictive equations for the ultimate strength of the connection.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 12p

Subject/Index Terms

Filing Info

  • Accession Number: 01763527
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03857
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:03AM