00209477

Component

https://onlinepubs.trb.or...bproceedings/38/38-007.pdf

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/

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.

01490413

1959

Highway Research Board Proceedings

Digital/other

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

Separation

Bridges and other structures; Construction; Data and Information Technology; Highways

TRIS, TRB

Sep 19 1971 12:00AM

• 17- YEAR REPORT ON THE OWENSBORO - HARTFORD COOPERATIVE INVESTIGATION OF JOINT SPACING IN CONCRETE PAVEMENTS
• A LABORATORY STUDY OF ANTI-STRIPPING ADDITIVES FOR HOT BITUMINOUS MIXES
• ACCELERATED PROOF-TESTS OF RUNWAY PAVEMENT, COLUMBUS AIR FORCE BASE, MISSISSIPPI
• ADMINISTRATION OF HIGHWAY TRANSPORTATION FUNCTIONS: STATUS AND RESEARCH NEEDS-- A SYMPOSIUM
• AN APPROACH TO THE STUDY OF LOCAL ROAD MANAGEMENT
• CATIONIC ASPHALT EMULSIONS: HOW THEY DIFFER FROM CONVENTIONAL EMULSIONS IN THEORY AND PRACTICE
• CORRELATION OF SELECTED SOIL INDICES WITH PLANT GROWTH ON HIGHWAY BACKSLOPES IN IOWA
• CRACKING OF ASPHALTIC CONCRETE ADJACENT TO TRAFFIC STRIPES
• CREEP AND SHRINKAGE IN LIGHTWEIGHT CONCRETE
• DEVELOPING TOOLS AND TECHNIQUES FOR GEOMETRIC DESIGN OF HIGHWAYS
• FINAL REPORT ON DESIGN PROJECT, MICHIGAN TEST ROAD
• FORECASTING ECONOMIC ACTIVITY FOR THE CHICAGO REGION
• FREQUENCIES OF VARIOUS LEVELS OF STRESS IN HIGHWAY BRIDGES
• FRICTION CONCEPT OF TRAFFIC FLOW
• FULL-SCALE APPRAISALS OF GUARDRAIL INSTALLATIONS BY CAR IMPACT TESTS
• INVESTIGATION OF LONGITUDINAL CRACKING REFLECTED THROUGH ASPHALTIC CONCRETE RESURFACING
• MEASUREMENT OF VISCO-ELASTIC PROPERTIES OF BITUMENS UNDER DYNAMIC LOADING
• MOTOR TRANSPORT STATISTICS AND THEIR USE IN HIGHWAY POLICY
• MUSKEG RESEARCH: A CANADIAN APPROACH
• ORGANIZING A CONTINUING AGENCY FOR A METROPOLITAN AREA TRANSPORTATION STUDY
• PAVEMENT PROFILE SURVEYS TO CORRELATE MICHIGAN DESIGN PRACTICE WITH SERVICE BEHAVIOR
• PREPARING OLD PAVEMENTS FOR RESURFACING WITH 50-TON COMPACTOR
• PROVISION OF BUS LOADING FACILITIES ON URBAN FREEWAYS
• RELATIONSHIPS OF CONCRETE STRENGTH TO MAXIMUM SIZE AGGREGATE
• SHOULDER OCCUPANCY ON RURAL HIGHWAYS
• STRUCTURAL AND TEXTURAL INFLUENCES ON THERMAL CONDUCTIVITY OF SOILS
• TRAFFIC INPUTS FOR SIMULATION ON A DIGITAL COMPUTER
• TRAVEL TIME - AN EFFECTIVE MEASURE OF CONGESTION AND LEVEL OF SERVICE
• USE OF EXPANDED CLAY AGGREGATE IN BITUMINOUS CONSTRUCTION
• UTILIZATION OF ELECTRONIC INSTRUMENTS IN GEODETIC SURVEYS FOR HIGHWAYS
• WARPING STRESSES AND DEFLECTIONS IN CONCRETE PAVEMENTS