Evaluation of continuity detail for precast prestressed girders.

Details

• Creators:
  Okeil, Ayman M. ; Cai, Steve C. S. ; Chebole, Veeravenkata ; Hossain, Tanvir
• Corporate Creators:
  Louisiana State University. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development
• Subject/TRT Terms:
  Bridge Construction Continuous Bridges--Louisiana Bridge Design Bridges--Design And Construction--Environmental Aspects--Louisiana Concrete--Creep Concrete Bridges Continuous Girder Bridges Creep Deformation Environmental Impacts Girder Bridges Prestressed Concrete Bridges Prestressed Concrete Construction--Louisiana Structural Design

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• Publication/ Report Number:
  FHWA/LA.11/477
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Edition:
  Final report; March 2008-Dec. 2010.
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The construction of highway bridges using precast prestressed concrete (PSC) girders is considered one of the most
  
  economical construction alternatives because of the advantages they offer (e.g. reducing formwork and rapid construction).
  
  Constructing multi-simple span bridges is an easy alternative for precast PSC girder bridges. However, the existence of
  
  expansion joints often leads to a host of problems in their vicinity due to drainage leaks and debris accumulation. The
  
  maintenance of expansion joints is, therefore, an activity that bridge owners would rather avoid by eliminating these joints by
  
  building connections between precast elements that are capable of resisting the forces resulting from establishing continuity.
  
  Several continuity details have been used over the years for slab-on-girder bridges with the goal of avoiding the
  
  aforementioned maintenance issues and reaping the benefits of continuity without the drawbacks of introducing it in large
  
  structures such as bridges (e.g. thermal movements). A new continuity detail is adopted in the John James Audubon Bridge
  
  that differs from the current standard detail in Louisiana. The new detail is based on the recommendation of the National
  
  Cooperative Highway Research Program (NCHRP) Report 519 [1].
  
  A 96-channel monitoring system was installed to provide information that can be used to assess the performance of the
  
  continuity detail. Embedded and surface-mounted sensors of different types were installed to measure strains, temperatures,
  
  rotations, and gap openings in critical locations in the monitored segment. Data from about 24 months of monitoring was
  
  collected. The data, its processing, and interpretation are presented in this report. Analyses based on NCHRP Report 519
  
  model and finite element models were also conducted to further understand the behavior of the new detail. Results from the
  
  analyses were also used to recommend girder age at continuity to meet prespecified design criteria. A live load test was also
  
  conducted to assess the performance of the new detail.
  
  Recommendations based on the findings of the project are drawn. It can be said that the continuity detail is capable of
  
  transferring forces between girder ends. However, girder ends may be subjected to high localized strains, especially due to
  
  thermal variation, which can cause cracking. Such cracks are detrimental to the shear strength of PSC girders. Therefore,
  
  thermal gradients need to be considered in the design of this detail.
  
  
• Format:
  PDF
• Funding:
  LTRC Project Number: 08-1ST;SIO Number: 30000150
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:78d83d242bf7ba089b3f54d14766bcdc7d0cf327bf5f11f96904b0eabdfc37f19281250f4a626bbe2d8c4129c416324a134acfa023e7de8ea16b7ed9c55c64a6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23071/dot_23071_DS1.pdf
• File Type:
  [PDF - 7.11 MB ]