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Reliability of crack detection for baseline condition assessments
Alternative Title
Reliability of crack detection for baseline, pre-construction condition assessments
Author(s)
Date Issued
2010-06
Date Available
2010-08-10T13:32:05Z
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.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
American Society of Civil Engineering (ASCE)
Journal
Journal of Infrastructure Systems
Volume
16
Issue
2
Start Page
129
End Page
137
Copyright (Published Version)
2010 ASCE
Subject – LCSH
Building inspection--Standards
Building--Accidents--Investigation
Imaging systems
Surveying--Methodology--Evaluation
Language
English
Status of Item
Peer reviewed
ISSN
1076-0342
This item is made available under a Creative Commons License
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