United States Department of Transportation
i
Integrated remote sensing and visualization (IRSV) system for transportation infrastructure operations and management, phase two, volume 2 : applications of LiDAR technology in structural evaluation under normal traffic operation and post blast loading.
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2012-03-01
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[PDF-3.04 MB]
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Abstract:This report focused on two potential applications of terrestrial LiDAR scans on highway
bridges: 1) vehicle crossing effects measured by3-D, terrestrial LiDAR scans of highway bridges
measuring clearance distance; and 2) bridge post-blast geometric assessments of ground-based or
vehicle-mounted terrestrial LiDAR scans. Data collected create a 3-D point cloud, which was
determined to be ideal for measuring before-and-after conditions on bridges and large culverts.
To determine the effects of ambient and seasonal temperature variation on clearance
measurements, periodic monitoring was conducted using data from a four-lane bridge on Harris
Boulevard near the UNC Charlotte campus. A simplistic but practical correlation analysis was
performed, again illustrating that operational LiDAR scanning is a viable technique for bridge
clearance measurements.
Terrestrial 3-D LiDAR scanners generate dense point cloud information that can be used
to establish baseline geometric information for structures and to establish critical dimensional
footprints for before and after-event comparisons. For close range blast effects, the pre-blast and
post-blast scans of a bridge were made in order to establish the potential and measure the impact
of construction blasting-induced effects, and in general, measure damages to bridges or large
culverts. The Colony Road bridge in southeast Charlotte was monitored before and after a nearby
construction blasting. Full-scale, three dimensional scans of the bridge conducted before and after
blasting. Critical sections and geometries were compared to ensure that the bridges were safe for
traffic.
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