Shake table tests on 1:2 reduced scale masonry house with the application of horizontal seismic bands

Yadav, Santosh; Sieffert, Yannick; Vieux-Champagne, Florent; Malécot, Y.; Hajmirbaba, Majid; Arléo, Luis; Crété, Eugénie; Garnier, Philippe

doi:10.1016/j.engstruct.2023.115897

Cited by 4 publications

(1 citation statement)

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“…The natural targets usually disappear completely when they are occluded, making it impossible to obtain continuous displacement. To obtain the continuous displacement response under occlusion, the artificial targets which disappear partially are usually pasted on the surface of the interested key location of the tested objects [20][21][22][23][24]. The ellipse target is widely used as one type of artificial target in photogrammetry and computer vision, because it is characterized by geometric and rotational invariance.…”

Section: Introductionmentioning

confidence: 99%

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

Liu,

Li,

Zhang

et al. 2023

Buildings

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High-speed videogrammetric measurements are widely used on shaking tables. However, during progressive collapse experiments, the protective string used to ensure the safety of personnel and the shaking table, mandated by safety considerations, can partially occlude the structural model. To address the problem of inaccurate tracking of the ellipse targets in image sequences due to the partial occlusion, this paper proposes a novel mutually guided tracking method for the partial occlusion situations. Firstly, the strategy of loopback detection is proposed to eliminate the cumulative errors with the initial tracking model and to replace the initial results of the tracking with those from the loopback detection. Secondly, tiny offset compensation is used to solve the problem of deviations. The experimental results demonstrate that the proposed method can achieve single-point localization at the sub-millimeter level and interlayer localization at the millimeter level within partially occluded environments. It is important that the proposed method meets the requirements of experimental accuracy on shaking tables and ensures the safety of personnel and facilities.

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