LOCALIZED STRESSES IN A POST-TENSIONED STEEL GIRDER WEB--FIELD VERIFICATION. PART 1: TEXT, TABLES AND FIGURES. FINAL REPORT

A steel plate girder and concrete deck slab bridge (Yuba Pass Bridge and Overhead) has been rehabilitated by placement of a concrete deck overlay, addition of lower steel flanges and post-tensioning of girder webs. A previous Caltrans report and TRB article discussed purely theoretical, pre-construction analyses with FINPLA and STRUDL made because of concern over potential large web stresses due to post-tensioning forces. A second phase study has been performed to modify previous analyses for assumed full clamping of post-tensioning brackets to webs and to verify analytical procedures by installation of SR-4 rosettes in the vicinity of a bracket on one girder web and monitoring during post-tensioning. STRUDL was used to assess stresses in a substructured, fine, finite element mesh, first with anchored boundaries, secondly, relaxed by boundary displacements determined by FINPLA with a coarse discretization. Assumptions included full composite and non-composite deck contributions, and uniform and non-uniform bracket loadings, the latter based on some observed slippage. Theoretical/experimental correlations were good for longitutdinal strains and minor (actually largest but compressive) principal stresses, less encouraging for vertical strains and major (smaller but more tensile) principal stresses. Correlations were improved when some composite action by the physically non-composite deck was assumed and for non-uniform bracket loading. Theoretical stresses were significantly reduced by assumption of full bracket clamping.

• Corporate Authors:

  California Department of Transportation

  1120 N Street
  Sacramento, CA  United States  95814

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Davis, R E
  • Klein Jr, E G
• Publication Date: 1987-6

Media Info

• Features: Figures; References; Tables;
• Pagination: 147 p.

Subject/Index Terms

• TRT Terms: Brackets; Clamps; Computer programs; Direct current; Driver rehabilitation; Field tests; Girder bridges; Posttensioning; Stresses; Webbing
• Uncontrolled Terms: Rehabilitation
• Subject Areas: Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls; I53: Construction of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00469718
• Record Type: Publication
• Report/Paper Numbers: FHWA/CA/SD-87/02, Rept 59313-624235
• Contract Numbers: F87SD13
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jul 31 1988 12:00AM