Crack detection limits in unit based masonry with terrestrial laser scanning

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Title: Crack detection limits in unit based masonry with terrestrial laser scanning
Authors: Laefer, Debra F.
Truong-Hong, Linh
Carr, Hamish
Singh, Manmeet
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Date: Mar-2014
Abstract: This paper presents the fundamental mathematics to determine the minimum crack width detectable with a terrestrial laser scanner in unit-based masonry. Orthogonal offset, interval scan angle, crack orientation, and crack depth are the main parameters. The theoretical work is benchmarked against laboratory tests using 4 samples with predesigned crack widths of 1–7 mm scanned at orthogonal distances of 5.0–12.5 m and at angles of 0°–30°. Results showed that absolute errors of crack width were mostly less than 1.37 mm when the orthogonal distance varied 5.0–7.5 m but significantly increased for greater distances. The orthogonal distance had a disproportionately negative effect compared to the scan angle.
Funding Details: European Research Council
Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2013 Elsevier
Keywords: Terrestrial laser scanning;Point cloud data;Crack detection;Structural health monitoring;Condition assessment;Masonry
DOI: 10.1016/j.ndteint.2013.11.001
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Institute Research Collection
Civil Engineering Research Collection

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