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http://dx.doi.org/10.5000/EESK.2002.6.6.025

Comparison of Modeling Methods of a Pile Foundation in Seismic Analysis of Bridge Piers  

김나엽 ((주)바우컨설탄트 지반터널부)
김성렬 (서울대하교 지구환경시스템공학부)
전덕찬 ((주)바우컨설탄트 지반터널부)
김명모 (서울대학교 지구환경시스템공학부)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.6, no.6, 2002 , pp. 25-32 More about this Journal
Abstract
In the seismic designing of bridges, the pile foundation of bridge piers generally have been modeled to have a fixed end for its convenience and conservative designing. The fixed-end assumption, however, produces very conservative results in terms of the pier forces. Therefore, many other design methods are evolved to consider the flexibility of the pile foundation. In this study, the response spectrum analysis was performed for a bridge pier having a pile foundation. The shear force, moment, and displacement, which occurred at the pier column under an earthquake loading, were compared to analyze the effects of the modeling method, soil condition and the input earthquake response spectrum. In most cases, the fixed-end model gives larger design forces than flexible foundation models. However, when a long period earthquake is applied to the bridge pier on a soft clay foundation, it is found that the flexible foundation models give larger design forces than the fixed-end model. In the end, the reliability of several flexible foundation models was verified by comparing their results with those of a numerical analysis that considers the soil-structure interaction phenomenon in a rigorous manner.
Keywords
bridge column; response spectrum analysis; soil-pile interaction; p-y curve; t-z curve;
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