Fatigue Behavior of Welded Shear Studs in Precast Composite Beams
Publication: Journal of Bridge Engineering
Volume 22, Issue 11
Abstract
Bridges consisting of full-depth precast concrete deck panels connected to steel girders are an increasingly popular option for accelerated bridge replacement. In designing the shear connectors for this bridge type, fatigue is often the governing failure mode. Typically, design provisions developed for cast-in-place deck systems are used. To date, only limited efforts have been undertaken to assess these provisions for precast applications. Most of the data has been obtained from push tests under constant-amplitude loading conditions. Against this background, this article presents measured strain, fatigue life, and autopsy results for 12 composite beam specimens (6 with precast concrete slabs) subjected to a variable-amplitude loading history until multiple stud failures were observed. The results indicate that shear studs in beams with precast slabs exhibit a fatigue performance at least on par with those in beams with cast-in-place slabs. In addition to yielding valuable fatigue data, the test results provide evidence of the effects of redundancy and the value of beam tests, rather than push tests, for assessing and designing shear connectors.
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Acknowledgments
Financial support for this research was provided by the Canadian Institute of Steel Construction (CISC) and is gratefully acknowledged. The Natural Sciences and Engineering Research Council of Canada (NSERC), the Ontario Graduate Scholarship (OGS) Program, and the Ministry of Transportation of Ontario (MTO) are also acknowledged for their financial support. Lab technicians Richard Morrison and Douglas Hirst are thanked for their assistance in casting and testing specimens. Research materials were donated by Hogg Ready Mix (Kitchener, Ontario, Canada) and King Construction Products (Burlington, Ontario, Canada).
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Information
Published In
Journal of Bridge Engineering
Volume 22 • Issue 11 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Nov 28, 2016
Accepted: May 23, 2017
Published online: Aug 31, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 31, 2018
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