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Dr. Yonas Zewdu Ayele
Department of Engineering, HØgskolen i Østfold, 1757 Halden, Norway

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0 Socio-economic Analysis
0 decision support tools
0 Smart Road Transport
0 Road and Traffic Planning
0 Dynamic Bayesian Networks to Resilience Analysis of Transport Networks

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Research article
Published: 07 January 2021 in Structure and Infrastructure Engineering
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Unmanned Aerial Vehicles (UAV) technology has found its way into several civilian applications in the last 20 years, predominantly due to lower cost and tangible scientific improvements. In its application to structural bridge inspection, UAVs provide two main functions. The first, being the most common, detect damage through visual sensors. The 2 D image data can be used to quickly establish a basic knowledge of the structure's condition and is usually the first port of call. The second reconstructs 3D models to provide a permanent record of geometry for each bridge asset, which could be used for navigation and control purposes. However, there are various types of hazards and risks associated with the use of UAVs for bridge inspection, in particular, in a cold operating environment. In this study, a systematic methodology, which is an integration of hazard identification, expert judgment, and risk assessment for preliminary hazard analysis (PHA) in the UAV-assisted bridge inspection system is proposed. The proposed methodology is developed and exemplified via UAV-assisted inspection of Grimsøy bridge, a 71.3 m concrete bridge, located in the Viken county in eastern Norway.

ACS Style

Mostafa Aliyari; Behrooz Ashrafi; Yonas Zewdu Ayele. Hazards identification and risk assessment for UAV–assisted bridge inspections. Structure and Infrastructure Engineering 2021, 1 -17.

AMA Style

Mostafa Aliyari, Behrooz Ashrafi, Yonas Zewdu Ayele. Hazards identification and risk assessment for UAV–assisted bridge inspections. Structure and Infrastructure Engineering. 2021; ():1-17.

Chicago/Turabian Style

Mostafa Aliyari; Behrooz Ashrafi; Yonas Zewdu Ayele. 2021. "Hazards identification and risk assessment for UAV–assisted bridge inspections." Structure and Infrastructure Engineering , no. : 1-17.

Journal article
Published: 27 November 2020 in Energies
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Bridges are a critical piece of infrastructure in the network of road and rail transport system. Many of the bridges in Norway (in Europe) are at the end of their lifespan, therefore regular inspection and maintenance are critical to ensure the safety of their operations. However, the traditional inspection procedures and resources required are so time consuming and costly that there exists a significant maintenance backlog. The central thrust of this paper is to demonstrate the significant benefits of adapting a Unmanned Aerial Vehicle (UAV)-assisted inspection to reduce the time and costs of bridge inspection and established the research needs associated with the processing of the (big) data produced by such autonomous technologies. In this regard, a methodology is proposed for analysing the bridge damage that comprises three key stages, (i) data collection and model training, where one performs experiments and trials to perfect drone flights for inspection using case study bridges to inform and provide necessary (big) data for the second key stage, (ii) 3D construction, where one built 3D models that offer a permanent record of element geometry for each bridge asset, which could be used for navigation and control purposes, (iii) damage identification and analysis, where deep learning-based data analytics and modelling are applied for processing and analysing UAV image data and to perform bridge damage performance assessment. The proposed methodology is exemplified via UAV-assisted inspection of Skodsberg bridge, a 140 m prestressed concrete bridge, in the Viken county in eastern Norway.

ACS Style

Yonas Zewdu Ayele; Mostafa Aliyari; David Griffiths; Enrique Lopez Droguett. Automatic Crack Segmentation for UAV-Assisted Bridge Inspection. Energies 2020, 13, 6250 .

AMA Style

Yonas Zewdu Ayele, Mostafa Aliyari, David Griffiths, Enrique Lopez Droguett. Automatic Crack Segmentation for UAV-Assisted Bridge Inspection. Energies. 2020; 13 (23):6250.

Chicago/Turabian Style

Yonas Zewdu Ayele; Mostafa Aliyari; David Griffiths; Enrique Lopez Droguett. 2020. "Automatic Crack Segmentation for UAV-Assisted Bridge Inspection." Energies 13, no. 23: 6250.

Conference paper
Published: 01 January 2019 in Proceedings of the 29th European Safety and Reliability Conference (ESREL)
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ACS Style

Philip Kobrich; Gabriel San Martin; Enrique Lopez Droguett; Alejandro Ortiz Bernardin; Yonas Zewdu Ayele. Physics Based Deep Learning Model for Crack Propagation Prognostics. Proceedings of the 29th European Safety and Reliability Conference (ESREL) 2019, 1 .

AMA Style

Philip Kobrich, Gabriel San Martin, Enrique Lopez Droguett, Alejandro Ortiz Bernardin, Yonas Zewdu Ayele. Physics Based Deep Learning Model for Crack Propagation Prognostics. Proceedings of the 29th European Safety and Reliability Conference (ESREL). 2019; ():1.

Chicago/Turabian Style

Philip Kobrich; Gabriel San Martin; Enrique Lopez Droguett; Alejandro Ortiz Bernardin; Yonas Zewdu Ayele. 2019. "Physics Based Deep Learning Model for Crack Propagation Prognostics." Proceedings of the 29th European Safety and Reliability Conference (ESREL) , no. : 1.

Conference paper
Published: 01 January 2019 in Proceedings of the 29th European Safety and Reliability Conference (ESREL)
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ACS Style

Yonas Zewdu Ayele; Enrique Lopez Droguett. Application of UAVs for Bridge Inspection and Resilience Assessment. Proceedings of the 29th European Safety and Reliability Conference (ESREL) 2019, 1 .

AMA Style

Yonas Zewdu Ayele, Enrique Lopez Droguett. Application of UAVs for Bridge Inspection and Resilience Assessment. Proceedings of the 29th European Safety and Reliability Conference (ESREL). 2019; ():1.

Chicago/Turabian Style

Yonas Zewdu Ayele; Enrique Lopez Droguett. 2019. "Application of UAVs for Bridge Inspection and Resilience Assessment." Proceedings of the 29th European Safety and Reliability Conference (ESREL) , no. : 1.