Experimental and analytical studies on the lateral instability of UHPFRC beams lifted by cables

Krahl, Pablo Augusto; Martins, Diego de Cambraia; Carrazedo, Ricardo; Silva, Irineu da; Debs, Mounir Khalil El

doi:10.1016/j.compstruct.2018.11.002

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The traditional crane structure detection methods, such as pulling the wire method and level method, belong to contact detection, which requires manual climbing with danger, and manual reading of the measurement error is bigger. In addition, optical detection methods, such as theodolite [1], total stations [2] and laser rangefinders [3], can only measure a single point, which is too inefficient and cumbersome to meet the demand for convenient, efficient and automated real-time monitoring of crane safety detection. Therefore, it is critical to find a large area, non-contact and efficient detection approach for crane main girder structure health monitoring [4].…”

Section: Introductionmentioning

confidence: 99%

Defect Detection and Recognition of Crane Girder Structure Based on 3D Reconstruction of UAV

Liu,

Yu,

Liang

et al. 2023

IEEE Access

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The traditional detection process of deformation or crack of crane main girder structure is tedious, inefficient and difficult to control safety risk. In this work, combining unmanned aerial vehicle (UAV) images with photogrammetry technology, an efficient and high-precision method for crane main girder defect detection and identification based on UAV 3D reconstruction is proposed. Firstly, the flight path, suitable for the chamfered rectangular section is selected, according to the structural characteristics of the main girder and the flight requirements of the UAV photography, and the calculation equation of flight strategy parameters is deduced. Secondly, based on 3D reconstruction methods and crucial techniques, the influence of image number, marker points and structure size effects on the accuracy of 3D reconstruction model are investigated, separately, thus comprehensively verifying the accuracy of the 3D reconstructed model. Finally, the proposed method is tested and evaluated by the experiments for deformation detection of crane main girder structure and crack identification of scaled carton, obtaining millimeter-level accurate results, and the high precision deformation detection and crack identification using non-contact 3D reconstruction are realized. The results demonstrate that the combination of UAV and photogrammetry show potential in the deformation detection of crane main girder structure, it also has a prospect in accurately evaluating the geometry of cracks and helping structural engineers to assess the health status of structures.INDEX TERMS Crane, UAV, 3D reconstruction, point cloud model, deformation, crack identification.

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Section: Introductionmentioning

confidence: 99%

Defect Detection and Recognition of Crane Girder Structure Based on 3D Reconstruction of UAV

Liu,

Yu,

Liang

et al. 2023

IEEE Access

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Key Construction Techniques for Cable Hoisting of Long-Span Steel Pipe Concrete Arch Bridge

Yang

2024

Lecture Notes in Civil Engineering

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Large span steel tube concrete arch bridges with the characteristics of high construction risk and high technical difficulty are usually constructed by cable hoisting technology. In this parper, the self-balance of the load-bearing main cable and optimized scheme for the main tower and anchor were proposed by conducting an iterative theoretical design calculation on the main cable. The design and key technology of the cable lifting system for large-span concretes filled steel tube arch bridge were investigated. Moreover, the “inverted loading method” was used for simulation analysis, which provides a scientific basis for the construction stage. The engineering practice results show that the optimization and innovation of the cable hoisting system can greatly improve design efficiency, enhance the safety of the cable system, and obtain good economic value.

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Analytical Nonlinear Rollover Behavior of Cambered Precast Concrete Beams on Flexible Supports

et al. 2020

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Experimental and analytical studies on the lateral instability of UHPFRC beams lifted by cables

Cited by 4 publications

References 17 publications

Defect Detection and Recognition of Crane Girder Structure Based on 3D Reconstruction of UAV

Defect Detection and Recognition of Crane Girder Structure Based on 3D Reconstruction of UAV

Key Construction Techniques for Cable Hoisting of Long-Span Steel Pipe Concrete Arch Bridge

Analytical Nonlinear Rollover Behavior of Cambered Precast Concrete Beams on Flexible Supports

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