Vibration Analysis for Monitoring of Ancient Tie-Rods

Collini, Luca; Garziera, Rinaldo; Riabova, Kseniia

doi:10.1155/2017/7591749

Cited by 13 publications

(13 citation statements)

References 24 publications

(51 reference statements)

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“…The identification of tie-rod natural frequencies can be carried out using any instrument capable of measuring the motion characteristics (displacement, velocity, acceleration) of the rod's axis. As of today, the most used devices are accelerometers [6][7][8][9][10][13][14][15][16][17]. These sensors may be used to perform either an Operational Modal Analysis (OMA) [16,17] or an Experimental Modal Analysis (EMA) [6][7][8][9][10][13][14][15].…”

Section: Existing Techniques To Measure Tie-rod Natural Frequenciesmentioning

confidence: 99%

“…Dynamic methods, on the other hand, require the identification of vibrational characteristics of the rod, either natural frequencies alone or the former together with the corresponding modal shapes. Varying in complexity and accuracy, several dynamic methods have been proposed, such as those by [7][8][9][10]. Accelerometers are the sensors commonly used to identify tie-rod natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Assessment of Axial Load in Tie-Rods by Means of Acoustic Measurements

2020

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Tie-rods are structural elements of crucial importance in ancient buildings to ensure structural integrity and safety, so the assessment of their effectiveness via an estimation of the axial load is of great importance. Dynamic techniques are often employed using accelerometers to measure the frequency response of the tie-rods. In this work, the frequency response of tie-rods is obtained with acoustic recording, thus introducing general-purpose microphones to potentially replace more expensive and complex sensors in this application. Two microphones were tested, one of known technical characteristics, and a second for which they were unknown. A procedure was designed to overcome the technical limitations of the latter, and two experimental campaigns were conducted to test the proposed method.

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Section: Existing Techniques To Measure Tie-rod Natural Frequenciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Assessment of Axial Load in Tie-Rods by Means of Acoustic Measurements

2020

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“…There are several uncertainties in determining the axial force value in this type of structural element, which include the complex boundary conditions [2][3][4][5] and geometrical and material properties [6]. Several approaches are used to estimate the force values in tie rods-static [7], dynamic [8], and mixed approaches [9]. In this paper, the previous approaches are only mentioned, while their detailed description can be found in [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Seismic Action on the Tie Rod System in Historic Buildings Using Finite Element Model Updating

et al. 2021

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Historic buildings have a high architectural value and their maintenance, repair and rehabilitation require a special approach. This approach is mainly based on the buildings’ performance under non-destructive tests such as operational modal analysis (OMA). Under extreme loads, such as earthquakes, these buildings require representative numerical models to simulate their expected response. In historic buildings, tie rods transfer axial loads and are typically used to balance horizontal trust due to static and dynamic loads associated with seismic actions. It is very important to determine the possibility of exceeding their load-bearing capacity under extreme loads, such as an earthquake. In this context, this paper presents an approach for the analysis of seismic action on the tie rod system in a historic building. The analysis was performed by combining the on-site experimental testing and the finite element model updating (FEMU) of the local models of tie rods and the global model of the structure. It was shown that the combination of analyzing local and global structural models, experimental on-site testing and FEMU is a viable solution for assessment of historic buildings’ load bearing capacity.

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“…The aforementioned approaches require considerable time for application and they are slightly destructive. Based on the mentioned disadvantages, many authors have researched a dynamic approach based on numerical or analytical methods [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Determination of Axial Force in Tie Rods of Historical Buildings Using the Model-Updating Technique

et al. 2020

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Tie rods are structural elements that transfer axial tensile loads and are typically used on walls, vaults, arches, and buttresses in historical buildings. To verify their load-bearing capacity and identify possible structural damage risks, the forces transferred by tie rods and the corresponding stresses must be determined. However, this is often a challenging task due to the lack of project documentation for historical buildings. Uncertainties like complex boundary conditions or unknown material and geometrical properties make it hard to assess the tie rods’ load level. This paper presents a methodology for the determination of axial forces in tie rods that combines on-site experimental research and a numerical model-updating technique. Along with the common approach based on a determination of the natural frequency of tie rods, this paper presents an approach based on tie rods’ mode shapes. Special emphasis is placed on the boundary conditions coefficient, which is a crucial parameter in the analytical solution for axial forces determination based on the conducted on-site experiments. The method is applied in a historical building case study.

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Vibration Analysis for Monitoring of Ancient Tie-Rods

Cited by 13 publications

References 24 publications

Dynamic Assessment of Axial Load in Tie-Rods by Means of Acoustic Measurements

Dynamic Assessment of Axial Load in Tie-Rods by Means of Acoustic Measurements

Analysis of Seismic Action on the Tie Rod System in Historic Buildings Using Finite Element Model Updating

Determination of Axial Force in Tie Rods of Historical Buildings Using the Model-Updating Technique

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