Report on Techniques for Bridge Strengthening. Design Example – Stringer Retrofit - Composite Action and Continuity Changes.

Details

• Creators:
  Ahlskog, C.
• Corporate Creators:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure
• Corporate Contributors:
  Modjeski and Masters
• Subject/TRT Terms:
  • Bridges
  • Strengthening (Maintenance)
  • Retrofitting
  • Bridge design
  • Composite materials
• Publication/ Report Number:
  FHWA-HIF-18-044
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure
• Abstract:
  This example involves the replacement of stringers during re-decking on an existing truss/floorbeam/stringer bridge. The existing stringers are non-composite rolled W24x76 beams, that were designed for HS-20 live loads. The design criteria is to provide new stringers to obtain a HS-25 live load rating factor equal to or greater than 1.0, while minimizing the weight of the new stringers. The flexural live load ratings of the new stringers were significantly increased by both making the stringers composite with the new deck and changing the continuity of the stringer spans. This example only involves a study of the flexural resistance of a typical interior span for the new and existing stringers using the Strength-I Limit State. This example is based on AASHTO LRFD Bridge Design Specifications, 7th Edition.
• Format:
  PDF
• Funding:
  DTFH61-11-H-00027
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/42821/dot_42821_DS1.pdf
• File Type:
  [PDF - 1.87 MB]
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:401cd51ec71649ffbc6ffa07aa995e87eb0204bdcbd8a8f36acfac30363806851fdf37eba3b4bc93c03d1f584a7c3d2b72675b58f048f27713bf3fcef7605aea