00209902

Component

http://onlinepubs.trb.org...s/hrr/1973/428/428-002.pdf

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/

Sponsored by Committee on Concrete Superstructures. 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.

01410344

Hanson, John M

pp 5-21

1973

Highway Research Record

52nd Annual Meeting of the Highway Research Board

030902157X

Digital/other

Figures (13) ; References (20) ; Tables (1)

Beams; Bents; Box girders; Bridges; Concrete; Design; Finite element method; Reinforced concrete bridges; Stresses; Webbing

Concrete beams

Bridges and other structures; Design; Highways

TRIS, TRB

Aug 5 1973 12:00AM

• COMPARISON OF BRIDGE STRESS HISTORY RESULTS WITH DESIGN- RELATED ANALYSES
• DYNAMIC ANALYSIS OF BEAM-SLAB HIGHWAY BRIDGES
• LOADING HISTORY OF SPAN 10 ON YELLOW MILL POND VIADUCT
• METHODOLOGY FOR EVALUATING THE AESTHETIC APPEAL OF BRIDGE DESIGNS
• STUDY OF AASHO LOADINGS ON A CONCRETE BOX GIRDER BRIDGE MODEL
• TIME-DEPENDENT BEHAVIOR OF HAWAIIAN AGGREGATE CONCRETE TO REPEATED LOADINGS