Abstract
Abstract. The high-speed videogrammetric measurement system, which provides a convenient way to capture three-dimensional (3D) dynamic response of moving objects, has been widely used in various applications due to its remarkable advantages including non-contact, flexibility and high precision. This paper presents a distributed high-speed videogrammetric measurement system suitable for monitoring of large-scale structures. The overall framework consists of hardware and software two parts, namely observation network construction and data processing. The core component of the observation network is high-speed cameras to provide multiview image sequences. The data processing part automatically obtains the 3D structural deformations of the key points from the captured image sequences. A distributed parallel processing framework is adopted to speed up the image sequence processing. An empirical experiment was conducted to measure the dynamics of a double-tube five-layer building structure on the shaking table using the presented videogrammetric measurement system. Compared with the high-accuracy total station measurement, the presented system can achieve a sub-millimeter level of coordinates discrepancy. The 3D deformation results demonstrate the potential of the non-contact high-speed videogrammetric measurement system in dynamic monitoring of large-scale shake table tests.
Highlights
In the field of civil engineering, the engineering structure should be evaluated by vibration test, wind tunnel, collapse and other tests to assess the structural quality and safety factor
A set of six high-speed cameras were used in the observation network to capture around the entire frame, and each two high-speed cameras formed a pair of stereoscopic observations
A control network was arranged with some control points positioned on the surrounding stationary scaffolds, and the 3D spatial coordinates of these control points were measured by a Sokkia NET05AX total station with a 0.5 mm distance measurement accuracy to provide a reference system and to assess the performance of videogrammetric measurement
Summary
In the field of civil engineering, the engineering structure should be evaluated by vibration test, wind tunnel, collapse and other tests to assess the structural quality and safety factor. The contact sensors such as displacement gauges, strain gauges, and accelerometers are commonly used for deformation measurement. These conventional sensors have limitations such as limited measurement range, ease of damage or failure, increased model quality, and time-consuming and laborious installation (Ribeiro et al, 2014, Ye et al, 2018). It is able to realize 3D multipoint and wide-range measurement as well as is capable of repetitive measurements and permanent records It is drawing increasing attention in both static and dynamic measurement (Fraser, Riedel, 2000, Maas, Hampel, 2006, Liu et al, 2015). In (Chang, Ji, 2007), the authors used two commercial-grade digital video cameras to measure 3D structural vibration response for three
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