High-Speed Videogrammetry for Seismic Performance of the Spherical Reticulated Shell Structure on the Shaking Table

Abstract

Spherical reticulated shell structure is an important structural form of large-span space buildings. It is of great significance to monitor three-dimensional (3D) dynamic responses of spherical reticulated shell structure to better understand its seismic performances, which will be helpful in the future to ensure the healthy condition of large-span space buildings during their lifespan. In this study, with the advantages of non-contact and high accuracy, a high-speed videogrammetric measurement method is proposed for monitoring the 3D dynamic responses of the seismically isolated, spherical, reticulated shell structural model. Two issues—the high-speed videogrammetric acquisition system and network configuration, as well as image sequence target tracking and positioning—are emphasized to achieve a cache of high-speed images and to improve the accuracy of tracking and positioning target points. The experimental results on the shaking table from the proposed method have been compared with those from traditional Optotrak Certus and accelerometers. The results prove that the proposed method is capable and useful for analyzing the seismic performance of spherical reticulated shell structures, as the dynamic responses monitoring accuracy of the method can reach the submillimeter level, with root mean square error values of 0.32 mm, 0.7 mm and 0.06 mm in the X, Y and Z directions, respectively.

Impact Dynamic Response of Spherical Net Shells: Finite Element-Based Computational Analysis Investigating the Influence of Dynamic Constitutive Models

“…Finally, the proposed numerical simulation was employed to validate the accuracy of the numerical analysis method for ultimately assessing the impact resistance of the shell structure. (2) Studying the influence of dynamic constitutive models on the numerical simulation of impact resistance of spherical net shells [24][25][26][27]. The influence of dynamic constitutive models on shell impact resistance numerical simulation was analyzed, with the consideration of the Cowper-Symonds [28] (C-S), J-C [29], MJ-C [30], and MxJ-C failure mode distributions of the shell impact failure models.…”

High-Speed Videogrammetry with Mutually Guided Target Tracking under Occlusion for Masonry Building Structure Displacement on a Shaking Table

“…Moreover, over the past 100 years, 77 percent of fatalities were caused primarily by the progressive collapse of masonry buildings in earthquakes [3]. Therefore, it is crucial to test the scaled masonry building models on a shaking table with the simulated seismic condition before many practical applications, as this can provide the response parameter to evaluate the tested structure model [4][5][6].…”