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Bridge Structural Identification Using Moving Vehicle Acceleration Measurements

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Dynamics of Civil Structures, Volume 2

Abstract

Identification of dynamic characteristics of structures is a desired objective for existing infrastructure and has been accounted as a serious challenge for civil engineers. In this research, a structural identification method is proposed, which is capable of identifying dynamics of structures using sensor data inside vehicles passing over a bridge. The methodology utilizes a special type of identification algorithm facilitated by Expectation Maximization (STRIDEX) that is capable of identifying systems using mobile data networks. In this study, it is assumed that the mobile sensor measurements are the accelerations inside rigid vehicles and are primarily a mixtures of accelerations caused by the road roughness and bridge dynamic acceleration. With this regard, a stochastic State-Space model represents the equation of motion for a linear dynamic vehicle-bridge system consisting of an impure input. The observation vector is treated as a linear mixture of two sources that are not known. Therefore, the problem turns to a Blind Source Separation (BSS) procedure that is aiming to draw out the bridge vibrations from the mixture. An algorithm called Second Order Blind Identification (SOBI) has been utilized for source separation and validated using simulation. The entire algorithm, including both SOBI and STRIDEX acting together, could successfully identify natural frequencies and mode shapes of a numerical bridge model.

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Acknowledgement

Research funding is partially provided by the National Science Foundation through Grant No. CMMI-1351537 by Hazard Mitigation and Structural Engineering program and by a grant from the Commonwealth of Pennsylvania, Department of Community and Economic Development, through the Pennsylvania Infrastructure Technology Alliance (PITA).

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA, USA

    Soheil Sadeghi Eshkevari & Shamim Pakzad

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  1. Soheil Sadeghi Eshkevari
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  2. Shamim Pakzad
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Correspondence to Soheil Sadeghi Eshkevari .

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Editors and Affiliations

  1. Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, Pennsylvania, USA

    Shamim Pakzad

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Sadeghi Eshkevari, S., Pakzad, S. (2019). Bridge Structural Identification Using Moving Vehicle Acceleration Measurements. In: Pakzad, S. (eds) Dynamics of Civil Structures, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-74421-6_34

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  • DOI: https://doi.org/10.1007/978-3-319-74421-6_34

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-74420-9

  • Online ISBN: 978-3-319-74421-6

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