Load Rating of Complex Bridges

Details

• Creators:
  Morcous, George ; Hanna, Kromel ; Tadros, Maher K.
• Corporate Creators:
  Mid-America Transportation Center
• Corporate Contributors:
  United States. Department of Transportation. Research and Innovative Technology Administration ; United States. Federal Highway Administration ; United States. Department of Transportation. Federal Transit Administration
• Subject/TRT Terms:
  • Load factor
  • Design load
  • Mechanical properties by mathematical limits or values
  • Arch bridges
  • Concrete bridges
  • Load rating
  • Tied-arch bridge
  • Legal loads
  • Prmit loads
  • Rating factor
  More +
• Publication/ Report Number:
  SPR-1(10) P329 ; 26-1120-0049-001
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Corporate Publisher:
  Nebraska Transportation Center
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
• Abstract:
  The National Bridge Inspection Standards require highway departments to inspect, evaluate, and determine load ratings for ; structures defined as bridges located on all public roads. Load rating of bridges is performed to determine the live load that ; structures can safely carry at a given structural condition. Bridges are rated for three types of loads, design loads, legal ; loads, and permit loads, which is a laborious and time-consuming task as it requires the analysis of the structure under ; different load patterns. Several tools are currently available to assist bridge engineers to perform bridge rating in a ; consistent and timely manner. However, these tools support the rating of conventional bridge systems, such as slab, Igirder, ; box girder and truss bridges. In the last decade, NDOR has developed innovative bridge systems through research ; projects with the University of Nebraska-Lincoln. An example of these systems is tied-arch bridge system adopted in ; Ravenna Viaduct and Columbus Viaduct projects. The research projects dealt mainly with the design and construction of ; the new system, while overlooking the load rating. Therefore, there is a great need for procedures and models that assist in ; the load rating of these new and complex bridge systems. The objective of this project is to develop the procedures and ; models necessary for the load rating of tied-arch bridges, namely Ravenna and Columbus Viaducts. This includes ; developing refined analytical models of these structures and performing rating factor (RF) calculations in accordance to the ; latest Load and Resistance Factored Rating (LRFR) specifications. Two-dimensional and three-dimensional computer ; models were developed for each structure and RF calculations were performed for the primary structural components (i.e. ; arch, tie, hanger, and floor beam). RFs were calculated assuming various percentages of section loss and using the most ; common legal and permit loads in the state of Nebraska in addition to AASHTO LRFD live loads. In addition, the two ; structures were analyzed and RFs were calculated for an extreme event where one of the hangers is fully damaged
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24743/dot_24743_DS1.pdf
• File Type:
  [PDF - 3.47 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:4a91f2643f6926b56a99ff1f994f97ede42186726ecdcfdf86c472eb109c3378