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Structural Health Monitoring of Short- and Medium- span reinforced concrete bridges

Structural Health Monitoring of Short- and Medium- Span Rein...

The 16th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-Hong Kong Forum on Mechanics and Its Application 2012

作者： H.F.Lam J.H.Yang Q.Hu H.Y.Peng Department of Civil and Architectural Engineering City University of Hong Kong

With the advances in sensor and data acquisition technologies,it is now possible to obtain a set of reliable dynamic ***,the extraction of useful information from this set of measurements for structural model updating and damage detection remains a challenging area of research.A key difficulty is the selection of a "suitable" class of *** is well known that the model parameter identification process is uncertain in nature due to the problems of modeling error, measurement noise,and "incomplete" *** the model class selected is too complicated (i.e.,has too many model parameters,see Fig.1 as an example),then the results of model identification with a given set of measurement will become very uncertain and even become *** is because the information that can be extracted from the set of measured data is not enough to solve all the uncertain parameters(i.e.,the unknowns in the problem).However,if the model class adopted is too simple(see Fig.2),then the prediction error will be very large,thus resulting in unreliable identification *** is because the class of models is too simple for representing the real *** this paper,rather than assume a single model class in the identification process,a multiple model-class approach that considers all "plausible" model classes in this process and weighs their relative importance through the Bayesian probabilistic approach will be *** concept of multiple model-classes is relatively new to *** is the main objective of this paper to illustrate this approach through simple examples and show its importance in structural model updating and structural health monitoring of reinforced concrete bridges.

关键词： span reinforced concrete bridges and Medium Structural Health Monitoring of Short

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