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SHMnet: Condition assessment of bolted connection with beyond human-level performance

Zhang, Tong, Biswal, Suryakanta and Wang, Ying (2020) SHMnet: Condition assessment of bolted connection with beyond human-level performance Structural Health Monitoring, 19 (4). pp. 1188-1201.

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Deep learning algorithms are transforming a variety of research areas with accuracy levels that the traditional methods cannot compete with. Recently, increasingly more research efforts have been put into the structural health monitoring domain. In this work, we propose a new deep convolutional neural network, namely SHMnet, for a challenging structural condition identification case, that is, steel frame with bolted connection damage. We perform systematic studies on the optimisation of network architecture and the preparation of the training data. In the laboratory, repeated impact hammer tests are conducted on a steel frame with different bolted connection damage scenarios, as small as one bolt loosened. The time-domain monitoring data from a single accelerometer are used for training. We conduct parametric studies on different layer numbers, different sensor locations, the quantity of the training datasets and noise levels. The results show that the proposed SHMnet is effective and reliable with at least four independent training datasets and by avoiding vibration node points as sensor locations. Under up to 60% additive Gaussian noise, the average identification accuracy is over 98%. In comparison, the traditional methods based on the identified modal parameters inevitably fail due to the unnoticeable changes of identified natural frequencies and mode shapes. The results provide confidence in using the developed method as an effective structural condition identification framework. It has the potential to transform the structural health monitoring practice. The code and relevant information can be found at

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Zhang, Tong
Date : 1 July 2020
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1177/1475921719881237
Grant Title : EP/R021090/1
Copyright Disclaimer : © The Author(s) 2019
Uncontrolled Keywords : Deep learning; Condition identification; CNN; Data preparation; Bolted connection
Depositing User : Clive Harris
Date Deposited : 05 Oct 2020 13:12
Last Modified : 05 Oct 2020 13:12

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