Wind Pressure and Strain Measurements on Bridges. II: Strain Transducer Development
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Volume 22, Issue 1
Abstract
The University of Colorado at Denver has been studying the effect of wind pressure on historic bridges to determine the structural adequacy of these structures. Several historic bridges have been field instrumented and tested to determine the member forces due to actual lateral wind pressures. This paper focuses on the development of an inexpensive reusable strain transducer that can be conveniently and nondestructively clamped to any structural member in a field condition. Prototype strain transducers have been extensively tested in the laboratory to verify reliability and repeatability of results and have been compared to finite-element modeling results. The best strain transducer has been successfully used in the field on the historic truss bridges. Each strain transducer costs approximately $50.
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Acknowledgments
The writers would like to express thanks to Paul Miller and Ed Moss for their excellent and efficient machining abilities, without whom this project would never have been completed.
References
Allen, B. (2001). “Instruction manual for installation of strain gauges and operation of strain reading equipment.” MS thesis, Univ. of Colorado at Denver, Denver.
Herrero, T. (2003). “Development of strain transducer prototype for use in field determination of bridge truss member forces.” MS thesis, Dept. of Civil Engineering, Univ. of Colorado at Denver, Denver.
RISA. (2003). RISA-3D, Ver. 5, RISA Technologies, Foothill Ranch, Calif.
Rutz, F. R. (2004). “Lateral load paths in historic truss bridges.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Colorado at Denver, Denver.
Rutz, F. R., and Rens, K. L. (2004). “Alternate load paths in historic truss bridges: New approaches for preservation.” Proc., 2004 Structures Congress, G. E. Blandford, ed., Structural Engineering Institute of the American Society of Civil Engineers, ASCE, Reston, Va.
Rutz, F. R., Rens, K. L., Jacobson, V. R., Hamedian, S., Elias, K. M., and Swigert, W. B. (2005). “Load paths in historic truss bridges.” Rep. No. 2004-25, prepared for National Center for Preservation Technology and Training, Natchitoches, La., by Univ. of Colorado at Denver, Denver.
Vishay. (2003). ⟨http://www.vishay.com⟩.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 22 • Issue 1 • February 2008
Pages: 12 - 23
Copyright
© 2008 ASCE.
History
Received: Mar 31, 2006
Accepted: Sep 19, 2006
Published online: Feb 1, 2008
Published in print: Feb 2008
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