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Estimating the standard deviation of eigenvalue distributions for the nonlinear free-vibration stochastic dynamics of cable networks

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Abstract

Cross-ties are used on cable-stayed bridges for mitigating wind-induced stay vibration. The system obtained by connecting two adjacent stays with a transverse cross-tie is the basic component of an “in-plane cable network”. Failures in the restrainers of cable networks have motivated investigations focusing on the nonlinear dynamics of cable networks. In these problems, the nonlinearity in the restoring force transferred by the cross-tie is used to simulate the behavior at incipient failure. The “equivalent linearization method” can be used to reduce the system of nonlinear dynamic equations to an equivalent eigenvalue/eigenvector problem, which is solved algebraically as a function of a reference amplitude parameter. Since the value of the initial vibration amplitude during aeroelastic vibration is affected by uncertainties, simulations based on stochastic processes must be considered. The resulting random nonlinear eigenvalue problem can be solved with an implementation of the standard stochastic approximation (SA). We propose here a novel numerical procedure, based on a “layered” SA algorithm, to estimate not only the mean but the standard deviation of the eigenvalue distribution as well. This method is computationally efficient and can accurately evaluate the average and standard deviation of the random eigenvalue (frequency), mode by mode. Therefore, we have now enabled a more complete and numerically efficient characterization of the frequency probability distribution.

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Acknowledgments

This study was supported in part by Northeastern University (NEU), Office of the Provost, “Tier-1 Seed Grant” for Interdisciplinary Research Projects in 2011–2014. The second author gratefully acknowledges the financial support of the “Regione Autonoma della Sardegna” (L.R. n. 7/2010, Grant “M4” CRP-27585 and L.R. n. 3/2008 “Rientro Cervelli”). Numerical computations were performed on the cyber-grid of the NEU’s College of Engineering; collaboration with Techila Technologies, Ltd. of Finland is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Northeastern University, 400 Snell Engineering Center, 360 Huntington Avenue, Boston, MA, 02115, USA

    Luca Caracoglia

  2. Department of Architecture, Design and Urban Planning, University of Sassari, Palazzo del Pou Salit, Piazza Duomo 6, 07041, Alghero, Italy

    Gian Felice Giaccu

  3. Department of Physics, Northeastern University, 111 Dana Research Center, 360 Huntington Avenue, Boston, MA, 02115, USA

    Bernardo Barbiellini

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  1. Luca Caracoglia
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  2. Gian Felice Giaccu
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  3. Bernardo Barbiellini
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Correspondence to Luca Caracoglia.

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Caracoglia, L., Giaccu, G.F. & Barbiellini, B. Estimating the standard deviation of eigenvalue distributions for the nonlinear free-vibration stochastic dynamics of cable networks. Meccanica 52, 197–211 (2017). https://doi.org/10.1007/s11012-016-0388-0

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