Research and Development of Measurement Method for Structural Fracturing Process in Shake Table Tests Using Image Processing Technique

Abstract

The largest three-dimensional shake table is now being constructed in Hyogo prefecture, Japan for a solution of fracturing process of structures, buildings, and soils. However, it seems to be difficult to measure the fracturing processes of the structures during severe earthquake by using conventional methods and equipment, because the three-dimensional measurement of larger dynamic displacement in excess of elastic region of the structure will be the key to a solution and cannot be obtained by any of the vibration pick-ups such as displacement transducers and so on. In this study, R&D of the new measurement method to clarify the fracturing process of the structures by applying a so-called motion capture technique, which has been mainly studied for modeling of human actions and motions. This paper describes the concept of the system, the outline of the proto-type image processing system developed in the study and the results of the shake table test using five-story steel-structure model to investigate the measurable accuracy of the system.

Investigation of the Seismic Safety Capacity of Aged Piping System: Shake Table Test on Piping Systems With Wall Thinning by E-Defense

“…The measurement points in total were 831channels. The measurement method using image processing technique [17] was also used to measure the overall deformation of the test models. The outer diameters of the elbows and tees, and the wall thickness of Elbow3~Elbow6 and Tee2 were also measured.…”

Optical motion tracking in earthquake-simulation shake table testing: Preliminary results

“…Imagebased systems are reported in [1], [2], [3]; the main drawback of such systems is that they need robust feature detection techniques. For marker-based systems, active and retro-reflective markers are quite popular [4], [5], [6] because the segmentation procedure for such markers is relatively straightforward (based on intensity). For systems where active markers are preferred (see [4]) they may need high-speed cameras in order to estimate accurate measurements.…”

“…For marker-based systems, active and retro-reflective markers are quite popular [4], [5], [6] because the segmentation procedure for such markers is relatively straightforward (based on intensity). For systems where active markers are preferred (see [4]) they may need high-speed cameras in order to estimate accurate measurements. For retro-reflective markers based systems [5], [6] some type of artificial illumination is needed.…”