Cyclic Lateral Load Response of Bridge Column-Foundation-Soil Systems in Freezing Conditions
Publication: Journal of Structural Engineering
Volume 132, Issue 11
Abstract
The potential effects of seasonal freezing on seismic response of integrated bridge column-foundation systems were investigated using three outdoor large-scale test units installed in glacial till soil. Two of these test units had identical dimensions and reinforcement details and consisted of diameter columns and foundation shafts. These units, which were tested during summer and winter at ambient temperatures of and , respectively, revealed the impact of the effects of seasonal freezing. When compared to the test at , the identical unit tested at showed 170% increase in effective elastic stiffness, 44% increase in average lateral force resistance, a upward shift to the maximum moment location, and a 64% reduction in the length of the plastic region in the foundation shaft. The third test unit had a diameter column with a diameter foundation shaft. The use of the oversized foundation minimized the effects of frozen condition on the response of the column although the construction of this column-shaft system was relatively complex. A summary of this experimental investigation is presented in this paper.
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Acknowledgments
The study reported in the paper was made possible through small grant exploratory research under Grant No. NSFCMS-0502117 from the National Science Foundation (NSF), financial support from Iowa State University and in-kind industry support. Special thanks are due to Dr. Steven McCabe, Dr. Doug Foutch, the program directors for the NSF award, Mr. Michael Kemery of Longfellow Drilling, Inc. for the construction of the test units at no cost, and Mr. Mike Lustig of Geotechnical Services, Inc. and Jeff Magner of Terracon for their in kind support towards the in situ soil tests at the outdoor test facility. In addition, the writers would like to thank EFCO, Inc., J.D. Steel Co. Inc., Ambassador Steel, Manatts Inc., and Premier Concrete Pumping Inc. for donating materials and/or labor to make the construction of the test units possible. Mr. Doug Wood, the structural engineering laboratory manager at Iowa State University, and several students, including Eli Branch, Sriram Aaleti, Curtis Holub, Mohamed Mekkawy, and Clinton Halverson provided assistance for the large-scale lateral load tests. Their contributions, especially in cold wintry conditions, are gratefully acknowledged.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 11 • November 2006
Pages: 1745 - 1754
Copyright
© 2006 ASCE.
History
Received: Sep 7, 2005
Accepted: Dec 16, 2005
Published online: Nov 1, 2006
Published in print: Nov 2006
Notes
Note. Associate Editor: Sashi K. Kunnath
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