The inner product vector as an output-only cross-correlation-based feature to structural damage assessment

Morgantini, Marcello; Betti, Raimondo

doi:10.21595/jve.2020.21373

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Among the non-destructive techniques, vibration-based methods have gained prominence due to their sensitivity to changes in stiffness and dynamic characteristics of the structure [14,[21][22][23]. Vibration-based methods involve exciting the structure with a known input signal and analysing the response to extract information about its stiffness, damping, and natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

Kurtenoks,

Kurajevs,

Buka-Vaivade

et al. 2023

Buildings

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With the growing popularity of timber structures, the requirement for reliable and non-destructive methods to assess the quality and condition of structural joints becomes increasingly essential. A novel coaxial correlations method is investigated to assess the degradation of panel-to-panel moment joints in timber structures. The method involves analysing the response data obtained from accelerometers placed on both sides of the joint and comparing the readings to evaluate the joint’s condition. A specific joint solution to simulate the degradation of the moment joint in laboratory conditions is selected based on its simplicity and the ease with which its degradation can be simulated. The joint consists of angle brackets joined with timber screws and bolts to plywood panels. Gradually unscrewing the timber screws reduces the joint’s stiffness to simulate wear and tear over time. The experimental setup includes static loading and finite element modelling (FEM) to determine the rotational stiffness of the investigated joint at each degradation level. A dynamic experiment using vibration loading with sweep signal in the frequency range of 10 Hz to 2000 Hz is conducted to assess the quality of the joint. The conducted research provides valuable insights into the behaviour of timber panel-to-panel connections. The findings highlight the relationship between joint stiffness, vertical displacements, and the proposed dimensionless parameter, volume root mean square value (RMSvol), which offers a more comprehensive assessment of the joint’s condition in three spatial directions. As a result of the research, it has been established that, in the case of linear-type connections, unlike point-type joints, there is a possibility of signal scattering, so it is recommended that power comparisons and evaluations of the response signals from both accelerometers at the initial stage of applying the coaxial correlations method are performed.

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Section: Introductionmentioning

confidence: 99%

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

Kurtenoks,

Kurajevs,

Buka-Vaivade

et al. 2023

Buildings

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“…This lowers the cost of construction but leads to an increase in the value of installation errors and expert control. There are many studies connected to searching the criteria for assessing buildings technical condition [4][5][6][7][8][9]. The main conclusion is that expert tests are necessary and relevant.…”

Section: Introductionmentioning

confidence: 99%

“…Determining dynamic criteria for assessing structural health is a critical and difficult task since many factors are affecting the system dynamics in various conditions [9]. Recently, a large number of works have appeared on structure dynamics separately and the entire building as a whole.…”

Section: Introductionmentioning

confidence: 99%

Bending shape curvature as dynamic criterion for the structural health control

Nesterenko¹,

Nesterenko²

2021

J. vibroeng.

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The paper describes a constructive system parameter -Bending shape curvature, as a dynamic criterion for assessing the technical state of structures. Previous studies of various dynamic criteria for structural health control have revealed a lack of accuracy. Analysis of a constructive system dynamic work based on internal response only is limited by a variety of external force factors, the determination of which is difficult. A constructive system can be deformed due to a change in cross-section stiffness at one of its elements because of a defect or damage and that affects displacements at its control points. It makes it difficult to determine bending stiffness only by constructive system displacements. As a result, the development of structure test methods with a control impact force is relevant. The article presents the methods of calculating bending shape curvature over controlled displacements. It is suggested to use an artificial impact on a structural system for getting the elements response to the bending moment. The advantage of bending shape curvature calculating for assessing the stiffness of a structure system is explained. It is shown the results of defect size influence on bending shape curvature during static tests and stiffness assessment results of the metal frame during dynamic tests. The necessity of taking into account the stiffness of structures joints has been revealed, as well as a high dependence of method's relative error on the value of dynamic shaker force and the distance between registration sensors.

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“…Mohammad used the cross-correlation damage index to determine the damage locations in the length of continuous deck bridges, and a comparison of the obtained analytical results with the experimental results showed that the proposed methods can determine the damage locations with appropriate accuracy for different damage scenarios [10]. Morgantini and Betti presented a structural damage assessment method that relies on a cross-correlation-based damage-sensitive feature, which is extracted from the dynamic response measured at different locations within a structure [11]. Li and Huang proposed an approach to identify structural states from eigenvectors constructed using cross-correlation functions.…”

Section: Introductionmentioning

confidence: 99%

Damage Identification of Ancient Timber Structure Based on Autocorrelation Function

Hou

Wang

et al. 2021

Advances in Civil Engineering

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A damage location method for the autocorrelation peak value change rate based on the vibration response of a random vibration structure is established. To calculate the autocorrelation function of the vibration response of each measurement point, we transformed the maximum values into an autocorrelation peak vector. Under a good condition, the autocorrelation peak vector has a fixed shape; hence, it can be used as a basis for structural damage identification. The two adjacent measurement points with the largest change corresponding to the two nodes of the damage unit and the damage location are determined to calculate the change rate of the autocorrelation peak values between damaged and intact structures. When the degree of damage is 5%, the autocorrelation peak value change rate of the acceleration response on the two nodes of the damage unit is significantly greater than that of the other points, which can accurately determine the damage location, indicating that the damage location index constructed has good damage sensitivity. The damage location index can determine a single damage, as well as a double damage. The antinoise capability of the damage location index gradually improves with an increase in the degree of damage. At 45% degree of damage and signal-to-noise ratio (SNR) of 0 dB, the damage location index can still accurately determine the damage location, which has good antinoise interference capability. The Xi’an Bell Tower is used as a case study, and the feasibility of this method is verified, which provides a new method for the study of damage location of ancient timber structures.

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The inner product vector as an output-only cross-correlation-based feature to structural damage assessment

Cited by 3 publications

References 19 publications

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

Bending shape curvature as dynamic criterion for the structural health control

Damage Identification of Ancient Timber Structure Based on Autocorrelation Function

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