00820983

Component

https://doi.org/10.3141/1770-20

http://scholar.google.com...erin&publication_year=2001

The Federal Highway Administration (FHWA) set up a validation test to compare the effectiveness of various nondestructive inspection techniques for detecting artificial defects in glued laminated (glulam) members. The validation test consisted of a glulam beam fabricated with artificial defects known to FHWA personnel but not originally known to the scientists performing the validation tests. Ultrasonic inspection was effective in identifying voids within the glulam beam. The glulam was inspected across the width and through the depth. The inspections from each direction were combined to accurately detect and locate artificial voids in three dimensions. Wave travel time allowed identification of some of the voids, but signal amplitude parameters, such as root-mean-square voltage and peak voltage, provided more precise location of the voids. The three-dimensional image provided valuable insight into the internal condition of the glulam. However, through-the-width inspection was able to locate voids in two dimensions along the length and depth of the glulam. For a field inspection, two-dimensional location of decay would provide sufficient information for judgments to be made on the future of the inspected specimen.

This paper appears in Transportation Research Record No. 1770, Design of Structures 2001.

English

p. 155-165

2001

Transportation Research Record

0309072328

Figures (11) ; Photos (1) ; References (3) ; Tables (1)

Air voids; Beams; Bridge members; Defects; Inspection; Laminated wood; Nondestructive tests; Test procedures; Ultrasonics; Validation

Three dimensional imaging; Two dimensional void location

Bridges and other structures; Design; Geotechnology; Highways; Materials; I24: Design of Bridges and Retaining Walls; I35: Miscellaneous Materials

TRIS, TRB, ATRI

Dec 10 2001 12:00AM

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• CONCRETE BRIDGE DECKS REINFORCED WITH FIBER-REINFORCED POLYMER BARS (WITH DISCUSSION AND CLOSURE)
• DEBRIS FLOW SIMULATION FOR HIGHWAY CROSS CULVERTS
• DESIGN OF PROFILE WALL THERMOPLASTIC PIPE FOR LOCAL BUCKLING (WITH DISCUSSION AND CLOSURE)
• DESIGN OF ROUTE 895 BRIDGE OVER JAMES RIVER IN VIRGINIA
• DIAGNOSTIC AND IN-SERVICE TESTING OF TRANSIT RAILWAY BRIDGE
• DYNAMIC LOADING OF BRIDGES
• EFFECT OF BEARING STIFFNESS AND SKEW ANGLE ON PERFORMANCE OF PRECAST CONCRETE BRIDGE
• EFFECTIVE USE OF PUBLIC INVOLVEMENT TO ACHIEVE AESTHETIC QUALITY IN BRIDGE DESIGN
• ESCAPE ADITS FOR TUNNEL SAFETY
• EXPERIMENTAL AND NUMERICAL EVALUATION OF BRACED-CHAIN EYEBAR BRIDGE
• EXPERIMENTAL CHARACTERIZATION OF METALLIC DAMPERS FOR SEISMIC RETROFIT OF HIGHWAY BRIDGES
• FATIGUE ASSESSMENT OF TRAFFIC SIGNAL MAST ARMS BASED ON FIELD TEST DATA UNDER NATURAL WIND GUSTS
• FIELD INVESTIGATION OF HIGH-PERFORMANCE CONCRETE BRIDGE DECKS IN SOUTH CAROLINA
• FIELD STUDIES OF STRENGTHENED TIMBER RAILROAD BRIDGE
• HEALTH MONITORING OF IRONTON-RUSSELL BRIDGE FOR RATING PURPOSES
• LONG-TERM DURABILITY OF STRUCTURAL COMPOSITE LUMBER IN BRIDGE APPLICATIONS
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• PERFORMANCE OF FIVE-SPAN STEEL BRIDGE WITH FIBER-REINFORCED POLYMER COMPOSITE DECK PANELS
• PERFORMANCE OF GLASS FIBER-REINFORCED POLYMER DECK ON STEEL GIRDER BRIDGE
• PUBLIC PARTICIPATION AND BRIDGE TYPE SELECTION
• REPAIR AND STRENGTHENING OF CONCRETE STRUCTURES THROUGH APPLICATION OF CORRECTIVE POSTTENSIONING FORCES WITH SHAPE MEMORY ALLOYS
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• SOIL PRESSURE MEASURED AT VARIOUS FILL HEIGHTS ABOVE DEEPLY BURIED THERMOPLASTIC PIPE
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• TIME-DEPENDENT DEFLECTION OF THERMOPLASTIC PIPES UNDER DEEP BURIAL
• UPDATE ON ANALYTICAL AND EXPERIMENTAL RESEARCH ON BRIDGE RESTRAINERS
• VIRTUAL REALITY IMAGES TO AID PUBLIC INVOLVEMENT IN APPEARANCE OF ROADS AND BRIDGES