Reliability of crack detection for baseline condition assessments

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Title: Reliability of crack detection for baseline condition assessments
Authors: Laefer, Debra F.
Gannon, Jane
Deely, Elaine
Permanent link: http://hdl.handle.net/10197/2331
Date: Jun-2010
Abstract: Despite billions of dollars of annual exposure from claims and litigation related to construction-induced damage, there are no quantitatively based, agreed upon standards or procedures as to what constitutes due diligence with respect to a pre-construction, condition assessment. Similarly, the relative accuracy, reliability, and costs for various inspection approaches are not well established. This paper compares the relative performance capabilities of crack detection by sidewalk-based, manual inspection with digital photography, terrestrial Light Detection and Ranging (LiDAR), and elevated manual inspections based on 2 brick and 2 concrete buildings (8.2-14.3m high) in Dublin Ireland. Results showed that non-manual methods tended to over-predict crack widths by at least 5 mm and underestimate crack lengths by one-half. Digital photography, however, detected the shortest cracks (as short as 17 mm) and had no significant decline in accuracy beyond 12m high, which he added benefit of generating a permanent, objective record. Terrestrial LiDAR proved neither particularly accurate nor cost-effective. Finally, operator-based, reliability problems emerged with all methods, with discrepancies of at least 11%. Overall, digital photography taken and archived, but not analyzed, was the most cost-effective, accurate, and reliable approach.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: American Society of Civil Engineering (ASCE)
Copyright (published version): 2010 ASCE
Keywords: Bricks;Cracking;Defects;Digital techniques;Field investigations;Masonry;Non-destructive tests;Imaging techniques;Site evaluation
Subject LCSH: Building inspection--Standards
Building--Accidents--Investigation
Imaging systems
Surveying--Methodology--Evaluation
DOI: 10.1061/(ASCE)1076-0342(2010)16:2(129)
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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