Experimental Instrumentation
UW Associate Professor Paolo Calvi and graduate student Tatsu Sweet partnered with RAPID faculty and staff to collect data characterizing damage sustained by a full-scale three-story reinforced concrete building subjected to simulated earthquake shaking on the shake table at the E-Defense facility in Miki City, Japan, in December 2019. RAPID equipment used in the study included the Leica BLK360 and Leica ScanStation P50 terrestrial lidar in combination with Leica surveying equipment and Canon cameras. The test program consisted of subjecting the structure to a series of earthquake ground motions with increasing amplitude; RAPID instrumentation was used to collect data prior to testing and after each ground motion. To collect dense point cloud datasets, characterizing both global deformation of the structure as well as local damage (e.g., concrete cracking and spalling), surveying equipment was used to establish the location of a series of high-resolution targets placed on the shake table facility (stationary), the shake table, and the building. The Leica BLK360 system was used at maximum resolution (3 mm at 10 m accuracy) requiring approximately 5 minutes to collect a full 3D point cloud with photographic image overlay; these data were supplemented with point cloud data collected using Leica P50 scans at maximum resolution (0.8 mm at 10 m), which required ~60 minutes to complete a full 360 scan.
