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  1. Development of flexural vibration inspection techniques to rapidly assess the structural health of timber bridge systems

    This paper describes an effort to develop a global dynamic testing technique for evaluating the overall stiffness of timber bridge superstructures. A forced vibration method was used to measure the natural frequency of single-span timber bridges in the laboratory and field. An analytical model based on simple beam theory was proposed to represent the relationship...

    Author(s):
    Xiping Wang; James P. Wacker; Robert J. Ross; Brian K. Brashaw; Robert Vatalaro
    Year:
    2005
    Keywords:
    Wood deterioration, deterioration, dynamic testing, bridges, testing, inspection, nondestructive testing, wooden bridges, bending strength, vibration tests, flexibility, timber bridges, stiffness
    Source:
    Proceedings of the 14th International Symposium on Nondestructive Testing of Wood : May 2-4, 2005, University of Applied Sciences, Eberswalde, Germany. Aachen, Germany : Shaker Verlag, 2005: ISBN: 3832239499: pages 113-121.

  2. Nondestructive assessment of timber bridges using a vibration-based method

    This paper describes an effort to develop a global dynamic testing technique for evaluating the overall stiffness of timber bridge superstructures. A forced vibration method was used to measure the natural frequency of single-span timber bridges in the laboratory and field. An analytical model based on simple beam theory was proposed to represent the relationship...

    Author(s):
    Xiping Wang; James P. Wacker; Robert J. Ross; Brian K. Brashaw
    Year:
    2005
    Keywords:
    Nondestructive testing, timber bridges, vibration methods, stiffness, bending
    Source:
    Proceedings of the 2005 structures congress, 2005 April 20-24, New York, NY. New York, NY : The Structural Engineering Institute of the American Society of Civil Engineers, 2005: [12] pages.

  3. Nondestructive assessment of single-span timber bridges using a vibration- based method

    This paper describes an effort to develop a global dynamic testing technique for evaluating the overall stiffness of timber bridge superstructures. A forced vibration method was used to measure the natural frequency of single-span timber bridges in the laboratory and field. An analytical model based on simple beam theory was proposed to represent the relationship...

    Author(s):
    Xiping Wang; James P. Wacker; Angus M. Morison; John W. Forsman; John R. Erickson; Robert J. Ross
    Year:
    2005
    Keywords:
    Timber bridges, NDE, vibration
    Source:
    Res. Pap. FPL-RP-627. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 15 p.

  4. Development of cost-competitive timber bridge designs for long-term performance

    Modern timber bridges have shown that timber is a durable option for primary structural members in highway bridges and can perform satisfactorily for 50 years or longer when properly designed, fabricated and maintained. However, various cost assumptions have indicated that timber bridges are more expensive than concrete bridges. This project was undertaken to better...

    Author(s):
    Brian Brashaw; James Wacker; Don Fosnacht; Matt Aro; Matthew Young; Robert Vatalaro
    Year:
    2020
    Keywords:
    Wooden bridges, highway bridges, timber, timber construction
    Source:
    Report No. MN 2020-16. St. Paul, MN: Minnesota Department of Transportation. 415 p.

  5. Estimating bridge stiffness using a forced-vibration technique for timber bridge health monitoring

    This paper describes an effort to refine a global dynamic testing technique for evaluating the overall stiffness of timber bridge superstructures. A forced vibration method was used to measure the frequency response of several simple-span, sawn timber beam (with plank deck) bridges located in St. Louis County, Minnesota. Static load deflections were also measured to...

    Author(s):
    James P. Wacker; Xiping Wang; Brian Brashaw; Robert J. Ross
    Year:
    2006
    Keywords:
    Dynamic testing, service life, wood deterioration, deterioration, nondestructive testing, vibration, wooden bridges, inspection, bridges, frequency response, bending strength, simple beam theory, bending mode frequency, stiffness, timber bridges
    Source:
    Proceedings : NDE Conference on Civil Engineering : a joint conference of the 7th Structural Materials Technology: NDE/NDT for Highways and Bridges and the 6th International Symposium on NDT in Civil Engineering, 2006 August 14-18, St. Louis, MO. Columbus, OH : American Society for Nondestructive Testing, Inc., 2006: ISBN: 1571171487: pages 63-70.

  6. Condition assessment of timber bridges. 2, Evaluation of several stress-wave tools

    This study was conducted to evaluate the accuracy and reliability of several stress-wave devices widely used for locating deteriorated areas in timber bridge members. Bridge components containing different levels of natural decay were tested using various devices. The specimens were then sawn (along their length) into slabs to expose their interior condition. The...

    Author(s):
    Brian K. Brashaw; Robert J. Vatalaro; James P. Wacker; Robert J. Ross
    Year:
    2005
    Keywords:
    Timber, bridge, inspection, stress wave, ultrasonic, nondestructive
    Source:
    Gen. Tech. Rep. FPL-GTR-160. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 11 p.

  7. Condition assessment of timber bridges. 1, Evaluation of a micro-drilling resistance tool

    The research presented in this report was conducted to evaluate the accuracy and reliability of a commercially available micro-drilling resistance device, the IML RESI F300-S (Instrument Mechanic Labor, Inc., Kennesaw, Georgia), in locating deteriorated areas in timber bridge members. The device records drilling resistance as a function of drilling depth, which allows...

    Author(s):
    Brian K. Brashaw; Robert J. Vatalaro; James P. Wacker; Robert J. Ross
    Year:
    2005
    Keywords:
    Timber, bridges, inspection, drilling resistance, nondestructive evaluation
    Source:
    Gen. Tech. Rep. FPL-GTR-159. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 8 p.
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