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Smart Structures and Systems
  Volume 26, Number 1, July 2020, pages 35-47

Damage detection in truss bridges using transmissibility and machine learning algorithm: Application to Nam O bridge
Duong Huong Nguyen, H. Tran-Ngoc, T. Bui-Tien, Guido De Roeck and Magd Abdel Wahab

    This paper proposes the use of transmissibility functions combined with a machine learning algorithm, Artificial Neural Networks (ANNs), to assess damage in a truss bridge. A new approach method, which makes use of the input parameters calculated from the transmissibility function, is proposed. The network not only can predict the existence of damage, but also can classify the damage types and identity the location of the damage. Sensors are installed in the truss joints in order to measure the bridge vibration responses under train and ambient excitations. A finite element (FE) model is constructed for the bridge and updated using FE software and experimental data. Both single damage and multiple damage cases are simulated in the bridge model with different scenarios. In each scenario, the vibration responses at the considered nodes are recorded and then used to calculate the transmissibility functions. The transmissibility damage indicators are calculated and stored as ANNs inputs. The outputs of the ANNs are the damage type, location and severity. Two machine learning algorithms are used; one for classifying the type and location of damage, whereas the other for finding the severity of damage. The measurements of the Nam O bridge, a truss railway bridge in Vietnam, is used to illustrate the method. The proposed method not only can distinguish the damage type, but also it can accurately identify damage level.
Key Words
    transmissibility; machine learning algorithm; Artificial Neural Networks (ANNs); Structural Health Monitoring (SHM); large-scale truss bridge
(1) Duong Huong Nguyen, H. Tran-Ngoc:
Department of Electrical energy, metals, mechanical constructions and systems, Faculty of Engineering and Architecture, Ghent University, Belgium;
(2) Duong Huong Nguyen:
Department of Bridge and Tunnel Engineering, Faculty of Bridge and Road, National University of Civil Engineering, Hanoi, Vietnam;
(3) H. Tran-Ngoc, T. Bui-Tien:
Department of Bridge and Tunnel Engineering, Faculty of Civil Engineering, University of Transport and Communications, Hanoi, Vietnam;
(4) Guido De Roeck:
Department KU Leuven, Department of Civil Engineering, Structural Mechanics, B-3001 Leuven, Belgium;
(5) Magd Abdel Wahab:
Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Vietnam;
(6) Magd Abdel Wahab:
Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.

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