Seasonal Frost Effects on the Soil–Foundation–Structure Interaction System
Publication: Journal of Cold Regions Engineering
Volume 21, Issue 4
Abstract
This paper presents the results of more than one year’s monitoring efforts and analysis of the effects of environmental variables on the dynamic properties of a selected bridge in Anchorage, Alaska. A seismic monitoring system was installed on the bridge to study these effects. The dynamic properties of the bridge have been identified from the recorded time histories which include ambient noises, traffic-induced vibrations, and small-magnitude earthquakes. Hourly air temperature data from nearby meteorological station during the period of study were collected to estimate the frozen soil depth for modeling purpose. A finite-element model and multiple-input autoregressive model were applied to study the effects of environmental variables on the dynamic properties. The results show that the environmental variables can significantly affect the dynamic properties by modifying the stiffness of the bridge system and the seasonal frost is found to have the dominating effects over air temperature on the bridge dynamic properties in cold regions. The results show that the models explain well the variation of dynamic properties with environmental variables.
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Acknowledgments
This project was supported in part by funds from the Alaska Experimental Program to Stimulate Competitive Research (AK EPSCoR) of the National Science Foundation (NSFEPS-0346770) and by the Alaska Department of Transportation and Public Facilities (AK DOT&PF). The third writer was supported by a fellowship from AK EPSCoR. These supports are gratefully acknowledged. The writers are thankful to Mr. Richard Pratt, Chief Bridge Engineer of AK DOT&PF for his enthusiastic support and suggestions. They are also grateful to the Alaska Railroad Corporation for providing in-kind support. Particularly, they want to thank Mr. James W. Kubitz, Vice President of Real Estate, and Mr. Tom Brooks, Chief Engineer, for their continued support. Special thanks are due to Dr. John Aho of CH2M HILL, Dr. He Liu of University of Alaska, Anchorage, and Dr. Douglas Goering of University of Alaska Fairbanks for their suggestions and support. Several graduate students, including Mr. Toshifumi Kono and Ms. Feifei Bai, provided assistance for the instrument installation and data analysis. Their contributions are acknowledged.
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Information & Authors
Information
Published In
Journal of Cold Regions Engineering
Volume 21 • Issue 4 • December 2007
Pages: 108 - 120
Copyright
© 2007 ASCE.
History
Received: Apr 18, 2006
Accepted: Dec 28, 2006
Published online: Dec 1, 2007
Published in print: Dec 2007
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