Soil-Bridge System Stiffness Identification through Field and Laboratory Measurements

Anastasios Sextos*, Periklis Faraonis, Volkmar Zabel, Frank Wuttke, Tobias Arndt, Panagiotis Panetsos

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
327 Downloads (Pure)

Abstract

Despite the major advances in finite-element (FE) modeling and system identification (SI) of extended infrastructures, soil compliance and damping at the soil-foundation interface are not often accurately accounted for due to the associated computational demand and the inherent uncertainty in defining the dynamic stiffness. This paper aims to scrutinize the effect of soil conditions in the SI process and to investigate the efficiency of advanced FE modeling in representing the superstructure-soil-foundation stiffness. For this purpose, measured, computed, and experimentally identified natural frequencies of a real bridge were used. Field measurements obtained during construction were reproduced both in the laboratory and by refined FE modeling. In addition, to understand the physical problem more thoroughly, three alternative soil conditions were examined: rock, stabilized soil, and Hostun sand. Discrepancies on the order of 3-13% were observed between the identified and the numerically predicted natural frequencies. These discrepancies highlight the importance of reliable estimation of soil properties and compliance with the SI framework for extended bridges under ambient and low-amplitude vibrations.

Original languageEnglish
Article number04016062
Number of pages13
JournalJournal of Bridge Engineering
Volume21
Issue number10
Early online date13 Apr 2016
DOIs
Publication statusPublished - Oct 2016

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