Post-Extreme Event Damage Assessment and Response for Highway Bridges (2016) / Chapter Skim
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Pages 13-21
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13 could have been avoided if more objective assessment techniques had been used (Phares et al.
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14 reading (Briaud et al.
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15 robustness of the measurements even in high turbulence conditions or with accumulation of debris, capability of taking measurements from both longitudinal and transverse inclination, and ease of installation. However, establishing a critical tilt angle at which the alarm would go off is hard as the bridge is always moving due to different type, of environmental and loading conditions (temperature variation, wind, and hydraulic forces)
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16 The data obtained from GPR systems are used to generate the tomography of the bridge deck. The quality of the tomography depends on the data sampling, the longitudinal resolution, and the distance between successive scan lanes, and in case of multiple antenna arrays, the lateral resolution will depend on the distance between two consecutive antennas (Benedetto 2013)
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17 many state DOTs. A buried or driven sliding magnetic collar is a hollow pipe that is driven or drilled into the streambed at scour-critical locations.
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18 recession. Compared to other forms of scour monitoring, the magnetic collars are more effective for floods with high sediment concentration.
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19 second phase of Bridge Doctor diagnoses the bridge damage state of "health" in terms of the spectral change within a temporal sequence of imagery acquired before and after the event. In this approach, changes between before and after scenes were identified in terms of difference and correlation values, measured along a central transect running along the highway and across the designated bridge.
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20 the target with a pulsed laser and then assessing the reflected light. The light pulses create precise, 3D data of the target.
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21 Marenchino (2009) also conducted an experiment that demonstrated the rapid mapping potential of employing imagery collected by UAVs.
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