Damage Quantification of Flexurally Loaded RC Slab Using Frequency Response Data

Koh, Sung-Woo; Maalej, Mohamed; Quek, Ser Tong

doi:10.1177/147592170400300401

Cited by 23 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5. Similarly to the previously reported findings [11,15], the frequency reduction is proportionally larger for the starting load increments. Only near and after the yielding level is reached, the rate of reduction is slowed down.…”

Section: Modal Analysis Resultssupporting

confidence: 72%

“…It was observed from the experimental modal analysis of the incrementally damaged RC beams and slabs [8,[11][12][13] that their frequency of the 1st vibration mode can be reduced up to 30% This paper has been published under the following reference: Pešić, N., Živanović, S., Dennis, J. when the yielding of the tensile reinforcement occurs [14,15]. Such magnitude of frequency reduction, being a consequence of structural damage, gave rise to the concept of damage identification by means of modal testing [16,17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures

Pešić

Živanović

Dennis

et al. 2015

Engineering Structures

View full text Add to dashboard Cite

full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription.For more information, please contact the WRAP Team at: publications@warwick.ac.uk This paper has been published under the following reference: Pešić, N., Živanović, S., Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures. Engineering Structures, Vol. 103, pp. 15-27, doi:10.1016/j.engstruct.2015 ABSTRACTThis work investigates influence of damage in reinforced concrete (RC) structures on their dynamic properties through modal testing and non-linear finite element (FE) analysis. Five RC beams were designed with the fundamental flexural mode frequencies in the range of 6.5-18.0Hz for the uncracked state. Mechanical properties of concrete, such as static and dynamic elastic moduli were determined from standard tests and ultra-sonic pulse velocity readings.The beams were incrementally loaded until the span/250 deflection limit was reached and their natural frequencies were measured from the free decay vibrations. The progressive damage reduced fundamental frequencies of tested beams by up to 25%. The non-linear FE analysis was carried out for RC beams and one two-span slab and the calculated reduced frequencies of the 1st and 2nd vibration modes were in excellent agreement with measurements. This led to the conclusion that, given that the non-linear analysis can capture degradation of dynamic stiffness due to cracking, the future dynamic performance and damage identification on the RC structure can be reliably determined from the same FE model. The results reveal potential of the combined modal testing and FE analysis to improve inspection and assessment of the inservice RC structures.Keywords: Concrete; Modal testing; FE analysis; Structural dynamics; Damage assessment This paper has been published under the following reference: Pešić, N., Živanović, S., Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures.

show abstract

Section: Modal Analysis Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures

Pešić

Živanović

Dennis

et al. 2015

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…Razak et al [ 27 ] studied the modal parameters of RC beams under the influence of steel corrosion and concluded that damping is an unreliable corrosion damage parameter of RC beams, while the natural frequency can effectively reflect the structural capacity changes caused by the steel corrosion in the test beams. Koh et al [ 28 ] and Capozucca et al [ 29 ] illustrated that the damage of the RC structure caused by steel corrosion will inevitably lead to the change of performance such as modal frequency, stiffness, damping ratio, and so on. However, these researches did not analyze the sensitivity of natural frequency response to the steel corrosion, and it is unknown whether the occurrence of steel corrosion can be identified even if no cracks can be observed on the surface of the structure.…”

Section: Introductionmentioning

confidence: 99%

Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Zhang

Cheng

Tan

et al. 2020

Sensors

View full text Add to dashboard Cite

This paper presented a laboratory investigation for analyzing the natural frequency response of reinforced concrete (RC) beams affected by steel corrosion. The electrochemical acceleration technique induced the corroded RC beams until the predetermined value of the steel corrosion ratio was achieved. Then, the natural frequency responses of the corroded beams were tested utilizing piezoelectric acceleration sensors. The damage states of the corroded beams were assessed through the measurement of crack parameters and the equivalent elastic modulus of the beams, which aims to clarify the fundamental characteristics of the dynamic response for the corroded RC beam with the increased steel corrosion ratio. The results revealed that steel corrosion reduces the bending stiffness of the RC beams and, thus, reduces the modal frequency. The variation of natural frequency can identify the corrosion damage even if no surface cracking of the RC beam, and the second-order frequency should be more indicative of the damage scenario. The degradations of stiffness and the natural frequency were estimated in this study by the free vibration equation of a simply supported beam, and a prediction method for the RC beam’s residual service life was established. This study supports the use of variations in natural frequency as one diagnostic indicator to evaluate the health of RC bridge structures.

show abstract

“…10 The wafi of the IMFs for EEG signal without spike wave, and spike I, II, and III sample waves Fig. 11 The wami of the IMFs for EEG signal without spike wave, and spike I, II, and III sample waves Spike I, II, and III waves of theγbands in the interval of 0-0.096 s were higher than that of the energy of RF to its referred total energy for the EEG signal without spike waves of theγband in the interval of 0-0.096 s. The frequency with the most power was determined using the weighted average frequency of the iIMF waf i , and the weighted average magnitude of the iIMF wam i [31][32][33] (http://www.vis.caltech.edu/%7Erodri/Wave_clus/Wave_ clus_home.htm). The weighted average frequency of the ith IMF is defined as follows:…”

Section: Discussionmentioning

confidence: 99%

Analysis of spike waves in epilepsy using Hilbert-Huang transform

Zhu

Lin

Chang³

et al. 2014

J Med Syst

View full text Add to dashboard Cite

In this paper, we used the Hilbert-Huang transform (HHT) analysis method to examine the time-frequency characteristics of spike waves for detecting epilepsy symptoms. We obtained a sample of spike waves and nonspike waves for HHT decomposition by using numerous intrinsic mode functions (IMFs) of the Hilbert transform (HT) to determine the instantaneous, marginal, and Hilbert energy spectra. The Pearson correlation coefficients of the IMFs, and energy-IMF distributions for the electroencephalogram (EEG) signal without spike waves, Spike I, Spike II and Spike III sample waves were determined. The analysis results showed that the ratios of the referred wave and Spike III wave to the referred total energy for IMF1, IMF2, and the residual function exceeded 10%. Furthermore, the energy ratios for IMF1, IMF2, IMF3 and the residual function of Spike I, Spike II to their total energy exceeded 10%. The Pearson correlation coefficients of the IMF3 of the EEG signal without spike waves and Spike I wave, EEG signal without spike waves and Spike II wave, EEG signal without spike waves and Spike III wave, Spike I and II waves, Spike I and III waves, and Spike II and III waves were 0.002, 0.06, 0.01, 0.17, 0.03, and 0.3, respectively. The energy ratios of IMF3 in the δ band to its referred total energy for the EEG signal without spike waves, and of the Spike I, II, and III waves were 4.72, 6.75, 5.41, and 5.55%, respectively. The weighted average frequency of the IMF1, IMF2, and IMF3 of the EEG signal without spike waves was lower than that of the IMF1, IMF2, and IMF3 of the spike waves, respectively. The weighted average magnitude of the IMF3, IMF4, and IMF5 of the EEG signal without spike waves was lower than that of the IMF1, IMF2, and IMF3 of spike waves, respectively.

show abstract

Damage Quantification of Flexurally Loaded RC Slab Using Frequency Response Data

Cited by 23 publications

References 10 publications

Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures

Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures

Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Analysis of spike waves in epilepsy using Hilbert-Huang transform

Contact Info

Product

Resources

About