Damage identification in reinforced concrete structures by dynamic stiffness determination

Maeck, Johan; Wahab, Magd Abdel; Peeters, Bart; Roeck, Guido De; Visscher, Joëlle De; Wilde, W. P. De; Ndambi, Jean-Marie; Vantomme, John

doi:10.1016/s0141-0296(99)00074-7

Cited by 107 publications

(67 citation statements)

References 8 publications

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“…(3), a continuous function for reduced flexural stiffness was proposed for damage identification on cracked RC beams with known frequencies [10]. Three damage parameters, denoted as α,β and n represent reduced stiffness of the cross-section, the length and the shape of the beam damaged zone and are iteratively determined by equating the measured frequencies with those calculated from the 2D segmental model of the beam.…”

Section: Introductionmentioning

confidence: 99%

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

Pešić

Živanović

Dennis

et al. 2015

Engineering Structures

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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.

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Section: Introductionmentioning

confidence: 99%

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

Pešić

Živanović

Dennis

et al. 2015

Engineering Structures

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“…The mass distribution is assumed to be known. A lumped mass matrix is used in equation (2). As the measurement mesh is rather dense, this is acceptable.…”

Section: Direct Stiffness Calculationmentioning

confidence: 99%

“…The method is explained and then applied to experimental data. For a more in-depth explanation of the method, refer to Maeck and De Roeck [1], Maeck et al [2].…”

Section: Introductionmentioning

confidence: 99%

Damage Assessment Using Vibration Analysis on the Z24-Bridge

Maeck¹,

Roeck²

2003

Mechanical Systems and Signal Processing

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“…Currently, damage identification based on the variation of modal parameters, such as resonant frequencies [23][24][25], mode shapes [26,27], mode shape curvatures [28,29], and modal strain energy [30][31][32], have been widely adopted. Most reticulated shell structure damage detection methods are also based on a variation of the modal parameters [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Experimental Damage Identification of a Model Reticulated Shell

Hao

et al. 2017

Applied Sciences

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Abstract:The damage identification of a reticulated shell is a challenging task, facing various difficulties, such as the large number of degrees of freedom (DOFs), the phenomenon of modal localization and transition, and low modeling accuracy. Based on structural vibration responses, the damage identification of a reticulated shell was studied. At first, the auto-regressive (AR) time series model was established based on the acceleration responses of the reticulated shell. According to the changes in the coefficients of the AR model between the damaged conditions and the undamaged condition, the damage of the reticulated shell can be detected. In addition, the damage sensitive factors were determined based on the coefficients of the AR model. With the damage sensitive factors as the inputs and the damage positions as the outputs, back-propagation neural networks (BPNNs) were then established and were trained using the Levenberg-Marquardt algorithm (L-M algorithm). The locations of the damages can be predicted by the back-propagation neural networks. At last, according to the experimental scheme of single-point excitation and multi-point responses, the impact experiments on a K6 shell model with a scale of 1/10 were conducted. The experimental results verified the efficiency of the proposed damage identification method based on the AR time series model and back-propagation neural networks. The proposed damage identification method can ensure the safety of the practical engineering to some extent.

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Damage identification in reinforced concrete structures by dynamic stiffness determination

Cited by 107 publications

References 8 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

Damage Assessment Using Vibration Analysis on the Z24-Bridge

Experimental Damage Identification of a Model Reticulated Shell

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