Estimation of nonlinearities from pseudodynamic and dynamic responses of bridge structures using the Delay Vector Variance method

Jaksic, Vesna and Mandic, Danilo P and Karoumi, Raid and Basu, Bidroha and Pakrashi, Vikram (2016) Estimation of nonlinearities from pseudodynamic and dynamic responses of bridge structures using the Delay Vector Variance method. In: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 441 . pp. 100-120.

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Abstract

Analysis of the variability in the responses of large structural systems and quantification of their linearity or nonlinearity as a potential non-invasive means of structural system assessment from output-only condition remains a challenging problem. In this study, the Delay Vector Variance (DVV) method is used for full scale testing of both pseudo-dynamic and dynamic responses of two bridges, in order to study the degree of nonlinearity of their measured response signals. The DVV detects the presence of determinism and nonlinearity in a time series and is based upon the examination of local predictability of a signal. The pseudo-dynamic data is obtained from a concrete bridge during repair while the dynamic data is obtained from a steel railway bridge traversed by a train. We show that DVV is promising as a marker in establishing the degree to which a change in the signal nonlinearity reflects the change in the real behaviour of a structure. It is also useful in establishing the sensitivity of instruments or sensors deployed to monitor such changes. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Delay Vector Variance (DVV); Signal nonlinearity; System identification; Instrumentation; Condition monitoring; Bridge
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	10 Dec 2015 06:21
Last Modified:	10 Dec 2015 06:21
URI:	http://eprints.iisc.ac.in/id/eprint/52901

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