PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 1997–2004

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Application of 3D laser scanning technique in precise identification of falling-off hazards of external walls D.B. Zhang, Z.L. Wang*, Y.Q. Zhang and X. Chen Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co. Ltd, Shanghai, 200032, China ABSRACT Falling-off of the external walls on high-rise building had occurred frequently in recently years, which caused the property damage or personal casualties and endanger urban public safety. A method using 3D laser scanning technique was studied for the detection of potential safety hazards such as hollowing and falling-off of building external walls. Based on the point cloud data, especially the z-coordinate values of the point cloud data, the identification criteria for the safety hazards such as hollowing and falling-off was established, and a precise hazard identification algorithm was developed and applied to quantitative detection of building external walls. The detection results were compared with that of the infrared thermal imaging to verify the identification ability for hazards with different positions or sizes. Fixed targets were arranged near the external wall to collect the point cloud data regularly, and the flatness model of the entire external wall was established. Then, the variation characteristics of the hollow area and height with time were analyzed based on contour lines generated from the flatness model, which would provide technical basis for the assessment and monitoring of falling-off hazard of external wall. The research results show that the proposed 3D laser scanning technique can precisely identify the falling-off hazards of building external wall. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: falling-off hazard of external wall, 3D laser scanning technique, point cloud data, quantitative identification, periodic monitoring. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Application of 3D laser scanning technique in precise identification of falling-off hazards of external walls D.B. Zhang, Z.L. Wang*, Y.Q. Zhang and X. Chen Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co. Ltd, Shanghai, 200032, China ABSRACT Falling-off of the external walls on high-rise building had occurred frequently in recently years, which caused the property damage or personal casualties and endanger urban public safety. A method using 3D laser scanning technique was studied for the detection of potential safety hazards such as hollowing and falling-off of building external walls. Based on the point cloud data, especially the z-coordinate values of the point cloud data, the identification criteria for the safety hazards such as hollowing and falling-off was established, and a precise hazard identification algorithm was developed and applied to quantitative detection of building external walls. The detection results were compared with that of the infrared thermal imaging to verify the identification ability for hazards with different positions or sizes. Fixed targets were arranged near the external wall to collect the point cloud data regularly, and the flatness model of the entire external wall was established. Then, the variation characteristics of the hollow area and height with time were analyzed based on contour lines generated from the flatness model, which would provide technical basis for the assessment and monitoring of falling-off hazard of external wall. The research results show that the proposed 3D laser scanning technique can precisely identify the falling-off hazards of building external wall. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: falling-off hazard of external wall, 3D laser scanning technique, point cloud data, quantitative identification, periodic monitoring. © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. Tel.: +86-21-64696581; fax: +86-21-64390552. E-mail address: wzllzw@163.com * Corresponding author. Tel.: +86-21-64696581; fax: +86-21-64390552. E-mail address: wzllzw@163.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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