EFFECTS OF TRANSVERSE TEMPERATURE GRADIENTS ON BRIDGES

THEORY ENABLING LONGITUDINAL TEMPERATURE INDUCED STRESSES TO BE PREDICTED FOR AN ARBITRARY SECTION SHAPE SUBJECTED TO AN ARBITRARY VERTICAL TEMPERATURE DISTRIBUTION IS DEVELOPED. A BOX-GIRDER BRIDGE, GIVEN AS AN EXAMPLE IN A SIMPLIFIED DESIGN METHOD IN COMMON USAGE IN NEW ZEALAND, IS ANALYZED UNDER A NUMBER OF DIFFERENT TEMPERATURE DISTRIBUTIONS. RESULTS SHOW THAT LOCAL STRESSES ARE VERY SENSITIVE TO THE TYPE OF TEMPERATURE DISTRIBUTION ASSUMED. CURVATURES, AND THEREFORE CONTINUITY EFFECTS, ARE LESS SENSITIVE, BUT STILL EXHIBIT SIGNIFICANT VARIATION. DESIGN TECHNIQUES FOR ESTIMATING TRANSVERSE STRESSES ARE DISCUSSED, AND SOME SECONDARY EFFECTS, INCLUDING BEARING LOADS AND HORIZONTAL TEMPERATURE GRADIENTS ARE MENTIONED. A WORK EXAMPLE OF TRANSVERSE STRESS CALCULATION INDICATES THAT THIS EFFECT IS OF THE SAME ORDER OF SIGNIFICANCE AS LONGITUDINAL EFFECTS. RESULTS OF LONGITUDINAL AND TRANSVERSE CALCULATIONS USING HAND-METHODS OF ANALYSIS ARE COMPARED WITH RESULTS FROM FINITE-ELEMENT ANALYSIS. THE COMPARISION IS VERY GOOD, CONFIRMING THE THEORY DEVELOPED. IT IS SUGGESTED THAT THE COMPUTER METHOD, THOUGH UNSUITABLE FOR MANY LONGITUDINAL DESIGN CASES, HAS ADVANTAGES IN THE ANALYSIS OF TRANSVERSE BEHAVIOUR. A SECTION ON ACTUAL TEMPERATURE GRADIENTS SUMMARISES THE EXISTING EXPERIMENTAL DATA, AND SUGGESTS A MATHEMATICAL EQUATION THAT GIVES REASONABLY GOOD REPRESENTATION OF ALL CASES. /TRRL/

  • Corporate Authors:

    Ministry of Works /New Zealand

    ,    
  • Authors:
    • Priestley, M J
  • Publication Date: 1971-9-20

Media Info

  • Features: Figures; References;
  • Pagination: 37 p.
  • Serial:
    • Volume: 394

Subject/Index Terms

Filing Info

  • Accession Number: 00210256
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: R&d Rpt
  • Files: TRIS
  • Created Date: May 24 1974 12:00AM