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Reality of virtual damage identification based on neural networks and vibration analysis of a damaged bridge under a moving vehicle

  • Neural Computing in Next Generation Virtual Reality Technology
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Abstract

Presented here is a reality of virtual damage detection and vibration behaviour study of a discrete beam-like bridge with one or several non-propagating edge cracks subjected to a moving vehicle. In this model, the simply supported beam elements are replaced by a range of rigid bars, which are connected by transverse and rotational springs, while the mass and rotational moment of inertia may be lumped at various points along the beam. The adopted vehicle model here is a four degrees-of-freedom, two axes half-vehicle model with tires flexibility and linear suspensions. Damage can be modelled by altering the spring stiffness equation at the crack position according to predictions, which allows the inclusion of simple or complex damage. To simplify, damage is represented here by an open crack, and stiffness of a given element with damage is calculated by fracture mechanics. Both the discrete element and finite element methods are used to investigate vibration analysis of a discrete beam model subjected to a moving vehicle to confirm model feasibility in vibration analysis under a moving vehicle. Besides, some dynamic response laws are obtained. Considering an irregular road profile, the effects of the moving vehicle velocity, the moving vehicle mass, the crack location and the crack depth on dynamic response of a beam-like bridge are analysed by a numerical example, combining a vehicle–bridge coupled vibration MATLAB program with ANSYS. In addition, the neural network is used to identify the damage of the structure. Numerical results of the numerical model predictions, compared with those obtained from the continuous elements beam, support the accuracy of the discrete elements beam model in both cases of undamaged beam and damaged one. The evidence for condition assessment and damage identification of bridge is obtained from this simulation as obtaining the vibrational characteristics of the damaged beam structure subjected to a moving vehicle. And the inversion results show that the neural network method can identify the injury location and injury size of the structure accurately.

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Acknowledgements

This work reported here was supported by the National Science Fund of China (51178305 and 51578370) and the Tianjin Research Program of Application Foundation and Advanced Technology (14JCYBJC21500). Any opinions, findings and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect those of the sponsor.

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Authors and Affiliations

  1. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin, 300072, China

    Chun-bao Xiong & Jin-song Zhu

  2. School of Civil Engineering, Tianjin University, Tianjin, 300072, China

    Hua-li Lu

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  1. Chun-bao Xiong
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  2. Hua-li Lu
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  3. Jin-song Zhu
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Correspondence to Hua-li Lu.

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Xiong, Cb., Lu, Hl. & Zhu, Js. Reality of virtual damage identification based on neural networks and vibration analysis of a damaged bridge under a moving vehicle. Neural Comput & Applic 29, 1331–1341 (2018). https://doi.org/10.1007/s00521-017-2841-y

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  • DOI: https://doi.org/10.1007/s00521-017-2841-y

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