Effect of temperature on modal variability for a curved concrete bridge

Chengyin Liu; John T. DeWolf

doi:10.1117/12.655811

11 April 2006 Effect of temperature on modal variability for a curved concrete bridge

Chengyin Liu, John T. DeWolf

Proceedings Volume 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems; 61743B (2006) https://doi.org/10.1117/12.655811
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

This paper presents the results of a study to determine the effect of temperature on modal variability on a curved post-tensioned box girder bridge with three continuous spans. The bridge has been monitored during the past 6 years using 16 accelerometers, 12 thermocouples and 6 tilt meters. Monitoring is based on normal vehicle loading. There is concern that changes due to temperature variations may mask changes due to structural damage. A thorough understanding of this uncertainty is necessary so that changes in vibration response resulting from damage can be discriminated from changes that are due to temperature variability. This paper presents the results of a study to evaluate the ambient vibration information over a full year period in which data was collected continuously. The effects of temperature change on the bridge's modal frequencies are analyzed and interpreted. This correlation between the natural frequencies and temperature is essential to establishing a structural health monitoring approach that can provide for indications that damage has occurred.

Citation Download Citation

Chengyin Liu and John T. DeWolf "Effect of temperature on modal variability for a curved concrete bridge", Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 61743B (11 April 2006); https://doi.org/10.1117/12.655811

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