Identification of damage-induced frequency decay on a large-scale model bridge

Tarozzi, Mirco; Pignagnoli, Giacomo; Benedetti, Andrea

doi:10.1016/j.engstruct.2020.111039

Cited by 10 publications

(7 citation statements)

References 29 publications

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“…The modal frequency results obtained from the measurement were approximately 19.8%–20.8% lower than that gained from the numerical analysis as summarized in Table 2. This percent reduction in natural frequencies indicates the degradation of structural stiffness due to existing structural deterioration 9–16,31 . This result is reasonable as several degradation and defects in precast RC walls and cast in‐situ walls were observed in 6th and 26th floors.…”

Section: Resultssupporting

confidence: 69%

“…Thus, the modal strain patterns of each wall could be affected significantly because of the change in the NA depth induced by the local cracks. To investigate the influence of defects on walls' behavior, the neutral axis location (c) in each wall was computed (see Figure 4a) using Equation (16).…”

Section: Neutral Axis Locationmentioning

confidence: 99%

“…To assess the structural performances of high‐rise buildings, modal analysis is generally applied to assist engineers in examining structural dynamic properties, which, in turn, helps engineers update their structural models corresponding to the detected damage 6–8 . By measuring the structural responses under ambient vibrations, modal parameters, including modal frequencies, mode shapes, and modal damping ratios, can be identified and interpreted as indices for the current dynamic state of an observed structure; changes in the modal parameters can indicate potential structural damage that occurred during distinct service periods 9–16 . Since this modal analysis under ambient vibration is a nondestructive method, it cannot create any negative effect on the measured buildings.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8] By measuring the structural responses under ambient vibrations, modal parameters, including modal frequencies, mode shapes, and modal damping ratios, can be identified and interpreted as indices for the current dynamic state of an observed structure; changes in the modal parameters can indicate potential structural damage that occurred during distinct service periods. [9][10][11][12][13][14][15][16] Since this modal analysis under ambient vibration is a nondestructive method, it cannot create any negative effect on the measured buildings. It can also be performed for operational conditions, making it suitable for assessment of existing structures.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamic characteristic measurement of precast and cast in‐situ walls in abandoned high‐rise building using ambient and forced vibration methods

Hang,

Karunkritkul,

Prayoonwet

et al. 2023

Structural Concrete

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This study evaluates the dynamic characteristics of an abandoned reinforced concrete building with structural deterioration and defects in its precast and cast in‐situ walls. Using ambient vibration and forced excitation, the dynamic characteristics (i.e., modal frequency, modal damping, and strain patterns) were extracted to evaluate existing performances. Then, the numerical modal analysis was conducted with the dynamic properties at the initial service stage since the joint degradation was not accounted. In general, modal frequency obtained from field measurement was approximately 19.8%–20.8% smaller than that obtained from the numerical analysis, indicating the degraded stiffness due to existing cracks at joint connections. In addition, the measured strain patterns and neutral axis location were eventually compared with the analytical results, proving the potential indicators for identifying local imperfections of the targeted high‐rise buildings.

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Section: Resultssupporting

confidence: 69%

Section: Neutral Axis Locationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic characteristic measurement of precast and cast in‐situ walls in abandoned high‐rise building using ambient and forced vibration methods

Hang,

Karunkritkul,

Prayoonwet

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…The scale replica preserves the materials and their properties; changes con- cern only the dimensions. More information about the model bridge manufacturing process and material properties can be found in [31].…”

Section: Resultsmentioning

confidence: 99%