Experimental study of the nonlinear effects generated in a concrete structure with damaged integrity

Kořenská, Marta; Manychová, Monika; Pazdera, Lubos

doi:10.1134/s1061830913090040

Cited by 8 publications

(10 citation statements)

References 5 publications

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“…It is based on the propagation of stress waves, which are generated by a mechanical impulse; the scheme is shown in Figure 7. A short-duration mechanical impact, produced by tapping a hammer against the surface of concrete, produces low-frequency stress waves (from 1 to 60 kHz) that propagate into the structure and are reflected by flaws and/or external surfaces [14,19]. Reflected waves are recorded on the surface by a sensor in the form of a voltage signal.…”

Section: Impact-echo Methodsmentioning

confidence: 99%

“…The results were verified by repeated measurement (three times). Various impulse intensity and response frequency spectra were also analyzed from the viewpoint of nonlinear effects [18,19].…”

Section: Data Acquisitionmentioning

confidence: 99%

“…In the case of the impact-echo method, the method is suitable for the detection, localization, and evaluation of discontinuities inside concrete [14][15][16], including evaluation of nonlinear effects [17][18][19]. Its advantage is that it allows measuring even in cases where it is not possible to evaluate the condition of the reinforcement directly in the monitored area (directly above it).…”

Section: Introductionmentioning

confidence: 99%

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Diagnostics of Reinforcement Conditions in Concrete Structures by GPR, Impact-Echo Method and Metal Magnetic Memory Method

et al. 2021

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It is important to use adequately reliable non-destructive methods that would be capable of determining the reinforcement conditions in concrete structures. Three different methods: ground penetrating radar, impact-echo method, and metal magnetic memory method were used for testing laboratory-prepared reinforced concrete beams (with a reinforcing bar of the same diameter along its whole length, reinforcing bar locally impaired, and reinforcing bar interrupted). The ground-penetrating radar proved the correlation of signal parameters with the reinforcing bar condition. An impairment/interruption reinforcing bar appeared in the record from measurements in the transversal and longitudinal direction by changes of the observed depth of the reinforcing bar from the concrete surface and direct wave attenuation. The impact-echo method proved that the shifts of the dominant frequencies from the response signal correspond with the impairment/interruption of the reinforcing bar. Results of diagnostics by the metal magnetic memory method were presented by a magnetogram of the magnetic field strength and field gradient on the measured distance. The changes in the magnetic field strength proved different stress concentration zones due to the reinforcing bar condition. The used non-destructive methods showed that they are capable of indicating the different reinforcement conditions in reinforced concrete beams. This paper indicates in which cases and for what reason it is appropriate to use these three methods and in what way they differ from each other.

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Section: Impact-echo Methodsmentioning

confidence: 99%

Section: Data Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diagnostics of Reinforcement Conditions in Concrete Structures by GPR, Impact-Echo Method and Metal Magnetic Memory Method

et al. 2021

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“…1 Photo of the intentionally weakened armatures Impact-echo method was used for specimen structure testing. This method was already described in detail, inclusive of the measuring apparatus previously [1] and will be only briefly described here. A short-duration mechanical impact, produced by tapping a hammer against the surface of concrete or masonry, produces low-frequency stress waves (from 1 to 60 kHz) that propagate into the structure and are reflected by flaws and/or external surfaces [2,3].…”

Section: Tested Object and Experimental Arrangementmentioning

confidence: 99%

An Initial Investigation on the Potential Applicability of Non-Destructive Methods to Assessing Joint Condition in Prefabricated Structures

Manychová

Fuciman

Pazdera

2016

SSP

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Prefabricated structures have brought quite a new quality into the design of building construction method, which in turn required deeper theoretical knowledge, replacing empirical approaches by theory, replacing idealized and often simplified models of structure behaviour by accurate material physical models and load models. High rigidity of prefabricated concrete structures and the resulting stress states, which are mainly due to the volume change effects (temperature, humidity), effects of the foundation base shape variations etc., are among the most frequent causes of failures, particularly of joints of building elements featuring insufficient yield and bearing capacity. Investigation of all prefabricated building types shows progressing joint armature corrosion, considerable impairment of welds, which should secure the positional reliability of façade slabs.The paper presents some results of our experimental study of the application potential of the impact-echo method to the non-destructive assessment of the present joint condition in prefabricated structures.

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“…Regarding the topic complexity, the research and development of these methods and the corresponding evaluation techniques, is still in its infancy. On the other hand, most published papers as well as our experience show these methods to be highly promising for both the defectoscopy and the material testing purposes in the near future [4,5].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of the Damage in Stone Blocks by Means of Non-Destructive Methods

Kořenská

Manychová

Pazdera

et al. 2013

KEM

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This paper deals with the damage assessment in stone blocks dismantled from a historic bridge construction. Nonlinear ultrasonic spectroscopy and impact echo methods were used for evaluating the stone block integrity structure. Harmonic analysis of the sample response on well defined ultrasonic excitation was used in the case of nonlinear ultrasonic method application. The amplitude dependent spectral changes of the probing signals were measured in the damaged blocks. Measurement results showed that the analysis of amplitude dependent spectral changes is a promising method for the damage assessment in structures. The Impact-Echo method is a technique for detecting defects in material structure such as stone blocks. It is based on monitoring the propagation of elastic waves from a short-duration mechanical impact. The aim of this paper is to provide an overview of the technique and to discuss the important parameters involved in this type of testing. The impact echo method is used to generate low-frequency stress waves from 500 Hz to 50 kHz that propagate into the structure and are reflected by defects and external surfaces.

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Experimental study of the nonlinear effects generated in a concrete structure with damaged integrity

Cited by 8 publications

References 5 publications

Diagnostics of Reinforcement Conditions in Concrete Structures by GPR, Impact-Echo Method and Metal Magnetic Memory Method

Diagnostics of Reinforcement Conditions in Concrete Structures by GPR, Impact-Echo Method and Metal Magnetic Memory Method

An Initial Investigation on the Potential Applicability of Non-Destructive Methods to Assessing Joint Condition in Prefabricated Structures

Monitoring of the Damage in Stone Blocks by Means of Non-Destructive Methods

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