Laser Scanning, Modeling, and Analysis for Damage Assessment and Restoration of Historical Structures

Takhirov, Shakhzod; Mosalam, Khalid M.; Moustafa, Mohamed A.; Myagkova, Liliya; Quigley, Brian

doi:10.7712/120115.3545.1384

Cited by 9 publications

(7 citation statements)

References 3 publications

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“…The monitoring of linear strains is described in [28] and that of non-linear surfaces is stated in [29]. The control over the strains may be carried out by different ways: laser scanning [30][31][32] (which allows the determination of seismic loadings, according to [33]); photogrammetry [34]; determination of drill-hole inclination and direction [35] and tachymetry survey [36].…”

Section: Discussionmentioning

confidence: 99%

Selection of tachymetry spacing in the process of monitoring of construction projects

2019

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The urbanization of territories and the increase in density of urban development cause the necessity of introduction of improved structural solutions into the construction practice. This is also connected with both the erection of higher buildings with longer span structures and the use of non-standard methods for the analysis of structures. The introduction of modern structural patterns lessens considerably the weight of structures, reduces the consumption of materials and cuts the construction production costs. At the same time, the responsibility for the construction projects enhances. A systematic control over the state of structures including a quasi-continuous one, allows us to reveal the very beginning of destructive processes and to take measures for their liquidation. One of monitoring methods is the tachymetry survey of positions of a number of adjusting marks fixed at the structural elements. The non-reflection mode of operation of tachymetry survey allows lifting the restrictions for the number of points under observations. The combination of the afore-said factors determines the urgency of the use of the tachymetry as a tool for monitoring the state of the construction project. The subject of the study: the subject of the present research work is the methodology of selection of tachymetry spacing during the deformation monitoring of a construction project. The tachymetry can be carried out both in the mode of focusing on pre-established marks, and in the non-reflection mode through the points on the structure. The disadvantage of the first method is the need of installation of light-reflecting marks, which is not always possible due to some technical and/or aesthetic reasons and may lead to a significant increase in the cost of monitoring. The disadvantage of the second method is a reduced accuracy of the measurements. A wide incremental step may lead to the failure of detection of deformation processes, a narrow step means a considerable increase in the monitoring time and an unjustified rise in the cost of monitoring. Objectives: the purpose of this research work is the optimization of tachymetry spacing, which will reveal all deviations of structural elements from their permanent positions by a value exceeding the accuracy of measurements. Materials and methods: the initial material for the study included the results of geodetic observations carried out at various construction projects, in particular, the tachymetry results. The method of study includes the comparing of the limiting admissible curvature value to the minimum deformation value measured with the tachymeter accuracy. Results: a methodology is suggested for the selection of the tachymetry survey step. On its basis, a formula for the determination of a step value is offered that takes into account the geometry of the structure, the strain capacity of the material and the accuracy of the survey. Conclusions: the obtained results allow us to optimize the number of the observation points during the tachymetry survey and to ensure the detection of all destructive effects associated with structural geometry changes at the construction project. The descriptions of the methodology are recommended for their application in the development of geodetic monitoring programmes.

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Section: Discussionmentioning

confidence: 99%

Selection of tachymetry spacing in the process of monitoring of construction projects

2019

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“…The simulations were limited to the elastic case. The material properties of the bricks from similar historic monuments were estimated earlier [1] by material tests. Test specimens were bored out from a brick as presented in Figure 10a and tested in an Universal Test Machine under compression load (shown in Figure 10b).…”

Section: Geometry and Materials Properties Of Finite Element Modelmentioning

confidence: 99%

“…The scans were conducted on August 13, 2015. The stitching was performed in Cyclone [1] and error did not exceed 3 mm for all scans used in the final registration. The monument was scanned from outside, inside of the main hall, and inside of a stairway with a large crack between the portal and the main structure.…”

Section: Laser Scanningmentioning

confidence: 99%

“…Since there is a very large variability in the material properties of masonry walls [1,[4][5][6][7], material tests were conducted on a brick recovered from the site. The material properties were homogenized in order to come up with the effective properties of a brick and mortar composite structure [8].…”

Section: Geometry and Materials Properties Of Finite Element Modelmentioning

confidence: 99%

“…The research team used this technology and conducted an extensive laser scanning program of many historic monuments in Uzbekistan. The program started in 2013 from scanning the famous Registan ensemble in Samarkand [1]. Later in 2015, it was expanded to more cities and monuments and the laser scanning was conducted in Tashkent, Bukhara, Samarkand and Shakhrisyabz.…”

Section: Introductionmentioning

confidence: 99%

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Detailed Numerical Analysis of a Historic Building Based on Its Current Condition Captured by Laser Scans and Materail Tests

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Ambient Vibration Study and Laser Scanning of Islam Khodja Minaret in Khiva (Uzbekistan)

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Laser Scanning, Modeling, and Analysis for Damage Assessment and Restoration of Historical Structures

Abstract: Abstract. High-definition laser scanning is rapidly becoming an essential tool for

Cited by 9 publications

References 3 publications

Selection of tachymetry spacing in the process of monitoring of construction projects

Selection of tachymetry spacing in the process of monitoring of construction projects

Detailed Numerical Analysis of a Historic Building Based on Its Current Condition Captured by Laser Scans and Materail Tests

Ambient Vibration Study and Laser Scanning of Islam Khodja Minaret in Khiva (Uzbekistan)

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