REINFORCING REQUIREMENTS FOR CONCRETE BEAMS WITH LARGE WEB OPENINGS

THE FINITE ELEMENT TECHNIQUE WAS USED TO ASSESS THE EFFECTS OF LARGE WEB OPENINGS IN THE BENT CAP REGION OF CONCRETE BOX GIRDER HIGHWAY BRIDGES. BENT CAPS WERE MODELED THAT CONTAINED OPENINGS RANGING IN SIZE FROM 0.21 TO 0.625 OF THE MEMBER DEPTH. THE SHAPE AND LOCATION OF THE OPENING WERE VARIED. SIXTY SIMPLY SUPPORTED BEAMS WERE ALSO ANALYZED TO PROVIDE THE BASIS FOR A WORKING STRESS DESIGN PROCEDURE SUGGESTED FOR USE IN DETERMINING THE REINFORCING REQUIREMENTS IN THE VICINITY OF THE OPENING. THE ANALYSIS SHOWED THAT A DESIGN BASED ON A SINGLE RECTANGULAR OPENING WOULD BE SATISFACTORY AS LONG AS ADJACENT OPENINGS WERE SEPARATED BY AT LEAST HALF THE DEPTH OF THE MEMBER. THE VIERENDEEL METHOD WAS FOUND TO BE ACCEPTABLE FOR DESIGNING THE REINFORCING IN THE CHORD REGIONS OF THE OPENING, WHEREAS SPECIAL CURVES WERE DEVELOPED TO PERMIT THE DESIGN OF THE REINFORCING NEEDED TO RESIST THE STRESS CONCENTRATIONS AT THE CORNERS. TWELVE LABORATORY SPECIMENS WERE DESIGNED IN ACCORDANCE WITH THE SUGGESTED DESIGN PROCEDURE. SUBSEQUENT TESTING INDICATED THAT THE REINFORCING PROVIDED AROUND THE OPENING ADEQUATELY STRENGTHENED THIS PORTION OF THE MEMBER SO THAT THE LOAD-CARRYING CAPACITY WAS GOVERNED BY THE BEHAVIOR OF THE SOLID PART OF THE BEAM. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 5-21
  • Monograph Title: Bridge evaluation and analysis
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00209902
  • Record Type: Publication
  • ISBN: 030902157X
  • Files: TRIS, TRB
  • Created Date: Aug 5 1973 12:00AM