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Abstract
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 between the first bending mode frequency and bridge stiffness (characterized as EI product). The results indicated that the forced vibration method has potential for quickly assessing superstructure stiffness of timber bridges, but improvements must be made in measurement system to correctly identify the first bending mode frequency in bridges in the field. The beam theory model was found to fit the physics of the superstructure of single-span timber bridges and could be used to correlate first bending frequency to global stiffness if appropriate system parameters are identified.
Keywords
Wood deterioration,
deterioration,
dynamic testing,
bridges,
testing,
inspection,
nondestructive testing,
wooden bridges,
bending strength,
vibration tests,
flexibility,
timber bridges,
stiffness
Citation
Wang, Xiping; Wacker, James P.; Ross, Robert J.; Brashaw, Brian K.; Vatalaro, Robert. 2005. Development of flexural vibration inspection techniques to rapidly assess the structural health of timber bridge systems. 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.
