Engineering Mechanics Institute Conference 2013

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Structural damping indicators from long term measurements

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Alfred Strauss
University of Natural Resources and Life Sciences
Austria

Michael Osterreicher
University of Natural Resources and Life Sciences
Austria

Konrad Bergmeister
University of Natural Resources and Life Sciences
Austria

Dan Frangopol
Lehigh University
United States

Abstract:
Based on the improved sensor techniques and the comparatively cheap computer equipment, structural monitoring has become an important tool in the field of structural lifetime assessment. Compared to the development in sensor and computer techniques the development of evaluation and interpretation methods is not able to keep up with. Inverse analysis techniques, experimental investigations in combination with inspection and monitoring information are promising for a comprehensive performance assessment.

The objective of this paper is to present a method to evaluate dynamic data (e.g. acceleration measurements) in order to obtain the time variable damping performance of concrete structures. The focus of this method, that can provide essential information for a comprehensive structural performance assessment, is the evaluation of damping values from long term monitoring data. The method is generally based on the cross-correlation of signals. From an initial estimate of the damping, which can be based on laboratory test, or values from the literature, a set of time histories is derived. These time histories are compared with the measured data; the time history which fits best, based on cross-correlation, provides the estimation of the damping values. The method was tested on a railway bridge.

 

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