ANALYSIS OF CONTINUOUS SKEWED SLAB BRIDGE DECKS

IN RECENT YEARS, HIGHWAY ENGINEERS HAVE BEEN MAKING FREQUENT USE OF THE CONTINUOUS SKEWED SLAB BRIDGES ON MODERN HIGHWAYS. DESPITE THIS FACT, AN ADEQUATE MATHEMATICAL ANALYSIS OF SUCH BRIDGES HAS NOT BEEN AVAILABLE FOR THE BRIDGE ENGINEER. A BRIDGE SLAB CAN BE ANALYZED BY THE PRINCIPLES OF THE THEORY OF PLATES. HOWEVER, DUE TO THE COMPLEXITY OF THE EXISTING BOUNDARY CONDITIONS IN CONTINUOUS SKEWED SLABS, THE APPLICATION OF THE HIGH-ORDER DIFFERENTIAL EQUATIONS BECOMES EXTREMELY DIFFICULT AND THE USE OF FINITE DIFFERENCE EQUATIONS FOR THE MATHEMATICAL ANALYSIS OF SUCH SLABS PROVIDES A MORE PRACTICAL AND YET ADEQUATE APPROACH. UTILIZING SUCH A FINITE DIFFERENCES METHOD, ALTOGETHER 32 DIFFERENT BRIDGE SLABS, WITH UNSTIFFENED EDGES, WERE ANALYZED. TWENTY-THREE OF THESE WERE THREE-SPAN CONTINUOUS SLABS AND HAD DIFFERENT ANGLES OF SKEW, WIDTH-CENTER SPAN LENGTH AND END SPAN-CENTER SPAN RATIOS. THE REMAINING 9 SINGLE-SPAN SLABS HAD ALSO DIFFERENT GEOMETRIC PARAMETERS. THE RANGE OF THESE PARAMETERS WAS DETERMINED SUCH THAT THE SLAB GROUP ENCOMPASSED THE MOST COMMON TYPES THAT ARE BEING BUILT IN ACTUAL PRACTICE. THE MATHEMATICAL ANALYSIS OF EACH SLAB INCLUDED THE SIMULTANEOUS SOLUTIONS OF GROUPS OF FINITE DIFFERENCE DEFLECTION EQUATIONS, COMPUTATIONS OF INFLUENCE COEFFICIENTS FOR DEFLECTIONS AND MOMENTS AT CRITICAL SLAB POINTS, TOGETHER WITH UNIFORM LOAD DEFLECTIONS AND MOMENTS. IBM 704 AND IBM 709 ELECTRONIC COMPUTERS WERE USED IN CONNECTION WITH THE MATHEMATICAL ANALYSIS, AND RESULTS ARE PRESENTED IN THE FORM OF TABLES, INFLUENCE SURFACE DIAGRAMS FOR DEFLECTIONS AND MOMENTS, AND CONTOUR DIAGRAMS FOR UNIFORM LOAD DEFLECTIONS AND MOMENTS. ALSO INCLUDED IN THE PAPER ARE VARIOUS DIAGRAMS SHOWING THE EFFECT OF VARIATION OF EACH PARAMETER ON THE MAXIMUM DEFLECTION AND MOMENT VALUES. TO VERIFY THE FINDINGS OF THE MATHEMATICAL ANALYSIS AND TO CORRELATE THE RESULTS TO REINFORCED CONCRETE STRUCTURES, 6 CONTINUOUS-SPAN AND 2 SINGLE-SPAN LABORATORY TEST STRUCTURES WERE DESIGNED BY UTILIZING VARIOUS REINFORCEMENT PATTERNS AND TESTED UNDER CONCENTRATED AND UNIFORM LOADS. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1963/34/34-002.pdf
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Yeginobali, Asim
• Publication Date: 1963

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 19-46
• Monograph Title: Bridge design, analysis and costs
• Serial:
  • Highway Research Record
  • Issue Number: 34
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bridge decks; Bridge members; Calculation; Coefficients; Computers; Continuous structures; Deflection; Equations; Finite differences; Geometric configurations and shapes; Highway bridges; Laboratory tests; Length; Loads; Mathematical analysis; Skew bridges; Structural plates; Tables (Data)
• Uncontrolled Terms: Bridge spans; Computation; Loading; Model tests; Parameters; Plates
• Old TRIS Terms: Continuous skewed slab bridges; Geometric shapes
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207693
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 12 1994 12:00AM