AN EXPERIMENTAL STUDY ON USE OF GLUED LAMINATED TIMBER FOR BRIDGE BEAMS

INFORMATION THAT WILL ALLOW DESIGN ENGINEERS TO UTILIZE GLUED LAMINATED TIMBER IN BRIDGES MORE EFFECTIVELY IS REPORTED. PAST INVESTIGATION HAD NOT ADEQUATELY CLARIFIED THE EFFECTS OF SCARF PROFILE, SCARF PATTERNS, AND DELAMINATION ON THE STRENGTH PROPERTIES OF CREOSOTED LAMINATED BEAMS IN FLEXURE. THIS PROGRAM, ALTHOUGH LIMITED BY TIME AND AVAILABLE FINANCING, ATTEMPTED TO (1) STUDY THE EFFECTS OF TWO TYPES OF SCARF PROFILE, (2) STUDY THE EFFECT OF THREE TYPES OF SCARF PATTERNS, AND (3) PROVIDE PILOT TESTS FOR THE EFFECTS OF DELAMINATION ON CREOSOTED LAMINATED BEAMS. FOR OBJECTS (1) AND (2) 81 BEAMS WERE USED, ALL 16 FT. LONG, ABOUT 5-1/4 IN. WIDE, AND BUILT UP OF 16 LAMINATIONS. FOR OBJECTIVE (3) 70 BEAMS, 9 FT. LONG, 3 IN. WIDE, AND BUILT UP OF EIGHT 3/4 IN. LAMINATIONS, WERE USED. BEAMS OF THE LARGER GROUP, ALL 16 FT. LONG, WERE LOADED SYMMETRICALLY AT POINTS 6 FT. APART. LOAD POINTS AND REACTIONS WERE PROVIDED WITH KNIFE EDGES AND BEARING PLATES. LOAD DEFLECTION READINGS WERE TAKEN TO ULTIMATE FAILURE. THE 70 SMALLER BEAMS (OBJECTIVE 3) WERE ALL TESTED BY MID-POINT LOADING. MOISTURE CONTENT OF THE SPECIMENS WAS MEASURED WITH AN ELECTRIC RESISTANCE-TYPE MOISTURE METER. ANALYSIS OF THE RESULTS LED TO SEVERAL SIGNIFICANT CONCLUSIONS AND INDICATIONS, BUT AT THE SAME TIME ESTABLISHED THE DESIRABILITY OF FURTHER TEST PROGRAMS. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/38/38-007.pdf
• Supplemental Notes:
  • Vol 38, pp 90-112, 8 FIG, 10 TAB, 6 REF. 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:
  • Tamberg, K G
  • Huggins, M W
• Publication Date: 1959

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Thirty-Eighth Annual Meeting of the Highway Research Board, Washington, D.C., January 5-9, 1959
• Serial:
  • Highway Research Board Proceedings
  • Volume: 38
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Adhesives; Bearing tests; Bridge construction; Bridge design; Bridge foundations; Bridges; Construction; Creosote; Laminated wood; Modulus of rupture; Moisture content; Statistical analysis; Strength of materials; Structural design; Timber
• Uncontrolled Terms: Separation
• Old TRIS Terms: Scarf joint; Timber (Structural)
• Subject Areas: Bridges and other structures; Construction; Data and Information Technology; Highways;

Filing Info

• Accession Number: 00209477
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 19 1971 12:00AM