High-Cycle Fatigue of Diagonally Cracked RC Bridge Girders: Laboratory Tests
Publication: Journal of Bridge Engineering
Volume 12, Issue 2
Abstract
Large numbers of conventionally RC deck–girder bridges are in the national highway system. Diagonal cracks have been identified in many of these bridges, which are exposed to millions of load cycles during service life. The anticipated life of these bridges in the cracked condition under repeated service loads is uncertain. Laboratory experiments were performed on full-size girder specimens to evaluate possible deterioration in shear capacity under repeated loading. Specimen variables included: T and inverted-T configurations, stirrup spacing, and flexural reinforcing details. Test results indicated bond deterioration increased diagonal crack displacements, and analysis methods to predict the shear capacity of diagonally cracked reinforced concrete girders subjected to high-cycle fatigue damage are provided. The AASHTO-LRFD shear provisions conservatively predicted shear capacity for the fatigued specimens without stirrup fractures, and shear capacity predictions from computer analysis program Response 2000 were very well correlated with experimental results for fatigued test specimens when the input concrete tensile strength was reduced to nearly zero.
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Acknowledgments
This research was funded by the Oregon Department of Transportation and Federal Highway Administration. Mr. Steven Soltesz was the research coordinator and his assistance is greatly appreciated. Dr. Robert Connor and Mr. Ian Hodgson of Lehigh University coordinated instrumentation of the field study bridges. The findings and conclusions are those of the writers and do not necessarily reflect those of the project sponsors or the individuals acknowledged.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 2 • March 2007
Pages: 226 - 236
Copyright
© 2007 ASCE.
History
Received: Dec 28, 2004
Accepted: Jan 3, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
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