Distribution factors for construction loads and girder capacity equations, final report.

Details

• Creators:
  Consolazio, Gary R. ; Honig, Jeffrey M.
• Corporate Creators:
  University of Florida. Dept. of Civil and Coastal Engineering
• Corporate Contributors:
  Florida. Dept. of Transportation. Research Management Center
• Subject/TRT Terms:
  • Highway bridges
  • Live loads
  • I beams
  • Loads
  • Prestressed concrete bridges
  • Girders
  • Concrete bridges
  • Distribution factor
  • construction load
  • thermal sweep
  More +
• Publication/ Report Number:
  Report 2017/124011
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  University of Florida. Department of Civil and Coastal Engineering
• Abstract:
  During the process of constructing a highway bridge, there are several construction stages that warrant ; consideration from a structural safety and design perspective. The first objective of the present study was to use analytical ; models of prestressed concrete girders (Florida-I Beams) at multiple stages of construction to update previously developed ; capacity equations for wind load and gravity load. Updated analytical bridge models were developed that accounted for a ; revised definition of lateral girder sweep—one that accounted for both maximum allowable fabrication tolerance as well as ; transverse thermal gradients (i.e., thermally induced sweep). Subsequently, analytical parametric studies were conducted to ; update—using the revised definition of sweep—previously developed girder capacity equations. The updated capacity ; equations take into consideration different Florida-I Beam cross-sections, span lengths, wind loads, skew angles, and brace ; stiffnesses. ; A second objective in this study was to use finite element analyses of partially constructed bridge systems— ; consisting of multiple Florida-I Beam (FIBs) with construction loads—to quantify distribution factors for interior and ; exterior girder end shear forces and maximum girder moments. A large-scale parametric study was conducted with ; consideration of different Florida-I Beam cross-sections, span lengths, girder spacing, deck overhang widths, skew angles, ; number of girders, number of braces, and bracing configurations (K-brace and X-brace) to quantify shear and moment ; distribution factor data. These data were subsequently used to develop empirical construction stage distribution factor (DF) ; equations at multiple levels of design conservatism.
  More +
• Format:
  PDF
• Funding:
  BDV31-977-46
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32132/dot_32132_DS1.pdf
• File Type:
  [PDF - 3.81 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b60802f0df7b292040eda4c01048116b7f16e4599ba12bd483ad12d1308f51ea