Characterization of Laser Scanners for Detecting Cracks for Post-Earthquake Damage Inspection

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26 Νοε 2013 (πριν από 3 χρόνια και 11 μήνες)

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Characterization of Laser Scanners for Detecting Cracks for Post
-
Earthquake
Damage Inspection

Engin Burak

Anil
1
, Burcu

Akinci
2
, James

H. Garrett
3
, O
zgur

Kurc
4


1
Carnegie Mellon University
, Department of Civil and Environmental Engineering,
5000 Forbes Ave., Pittsburgh, PA, 15213,
eanil@andrew.cmu.edu

2
Carnegie Mellon University
, Department of Civil and Environmental Engineering,
5000 Forbes Ave., Pittsburgh, PA, 15213,
bakinci@cmu.edu

3
Carnegie Mellon University
, Department of Civil and Environmental Engineering,
5000 Forbes Ave., Pittsburgh, PA, 15213,
garrett@cmu.edu

4
Middle East Technical University
, Department of Civil

Engineering,
Ankara, Turkey,
06800,
kurc@metu.edu.tr



ABSTRACT


Objective, accurate, and fast assessment of damage to buildings after an earthquake is
crucial for timely remediation of material losses and safety of

occupants of buildings.
Laser scanners are promising sensors for collecting geometrical data regarding the
damaged states of buildings as they are able to provide high coverage and accuracy at
long ranges. Yet, we have limited knowledge on the performance

of laser scanners for
detecting earthquake damage, and requirements of such data collection. This paper
focuses on characterizing the performance of laser scanners for detecting thin cracks
for damage assessment of reinforced concrete frames. A series of
crack parameters
has been identified based on the state
-
of
-
the
-
art damage assessment codes and
standards. Similarly, parameters, which affect the performance of laser scanners for
detecting cracks, have been identified based on literature. Width, depth, an
d
orientation of cracks; sampling interval of the scanner, range, and angle of incidence
of the laser beam with the surface were studied. Effects of these parameters on the
minimum crack size that can be identified from the laser scan data were determined
in
an experimental setting. An automated algorithm was used to take more than 20,000
crack measurements. The results show that it is possible to detect as small as ~1mm
cracks.

Keywords
:
Earthquake; Damage assessment; Laser scanning; Crack detection;
Reinfo
rced concrete frames



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