Repair methods for prestressed girder bridges.

Details

• Creators:
  Harries, Kent A. ; Kasan, Jarret ; Aktas, John
• Corporate Creators:
  University of Pittsburgh. Dept. of Civil & Environmental Engineering
• Corporate Contributors:
  Pennsylvania. Dept. of Transportation. Bureau of Planning and Research
• Subject/TRT Terms:
  • Bridges
  • Prestressed concrete bridges
  • Girders
  • Bridge design
  • Bridges--Pennsylvania
• Publication/ Report Number:
  FHWA-PA-2009-008-PIT 006
• Resource Type:
  Tech Report
• Geographical Coverage:
  Pennsylvania
• Edition:
  Final report.
• Corporate Publisher:
  Pennsylvania. Dept. of Transportation
• Abstract:
  It is common practice that aging and structurally damaged prestressed concrete bridge members are taken out of service and replaced. ; This, however, is not an efficient use of materials and resources since the member can often be repaired in situ. There are numerous ; repair techniques proposed by entrepreneurial and academic institutions which restore prestressed concrete girder flexural strength and ; save both material and economic resources. Of course, not all repair methods are applicable in every situation and thus each must be ; assessed based on girder geometry and the objectives of the repair scenario. This document focuses on the practical application of ; prestressed concrete bridge girder repair methods. ; In this document, repair methods are presented for three prototype prestressed concrete highway bridge girder shapes: adjacent boxes ; (AB), spread boxes (SB), and AASHTO-type I-girders (IB), having four different damage levels. A total of 22 prototype repair designs ; are presented. Although not applicable to all structure types or all damage levels, the repair techniques covered include the use of ; carbon fiber reinforced polymer (CFRP) strips, CFRP fabric, near-surface mounted (NSM) CFRP, prestressed CFRP, post-tensioned ; CFRP, strand splicing and external steel post-tensioning. It is the authors’ contention that each potential structural repair scenario ; should be assessed independently to determine which repair approach is best suited to the unique conditions of a specific project. ; Therefore, no broad classifications have been presented directly linking damage level (or a range of damage) to specific repair types. ; Nonetheless, it is concluded that when 25% of the strands in a girder no longer contribute to its capacity, girder replacement is a more ; appropriate solution. Guidance with respect to inspection and assessment of damage to prestressed concrete highway bridge girders ; and the selection of a repair method is presented. These methods are described through 22 detailed design examples. Based on these ; examples, review of existing projects and other available data, a detailed review of selection and performance criteria for prestressed ; concrete repair methods is provided. ; Best practices based on the study objectives are presented.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16951/dot_16951_DS1.pdf
• File Type:
  [PDF - 10.56 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:51ad1a0a38b3f3080aa2c74cde1e9e9bb0e26227c3c6ec34ee872506c0e69eff