Fundamental Frequency Testing of Reinforced Concrete Beams

Newtson, Craig M.; Johnson, G.; Enomoto, Brian T.

doi:10.1061/(asce)0887-3828(2006)20:2(196)

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…Other research papers dealing in part with the problem considered here describe the determination of the Young's modulus of concrete on the basis of the longitudinal vibration frequency by means of an analytical procedure [13], and investigations of the dynamic gain in the Young's modulus over time [14]. A substantial number of analyses are devoted to the study of the dynamic flexural stiffness of reinforced concrete beams [10,[15][16][17][18][19], including RC beams strengthened with CFRP materials [20]. Dynamic test methods can also be used to identify defects in reinforced concrete beams [21].…”

Section: State Of the Art -Selected Testsmentioning

confidence: 99%

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Determining the Young’s modulus of concrete by measuring the eigenfrequencies of concrete and reinforced concrete beams

Musiał

Grosel

2016

Construction and Building Materials

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Section: State Of the Art -Selected Testsmentioning

confidence: 99%

“…Newtson et al [10]. Prior to tests on beam elements, the dynamic and static Young's moduli had been determined for concrete cylinders in accordance with the ASTM standards [7,8].…”

Section: State Of the Art -Selected Testsmentioning

confidence: 99%

Determining the Young’s modulus of concrete by measuring the eigenfrequencies of concrete and reinforced concrete beams

Musiał

Grosel

2016

Construction and Building Materials

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“…Knowing the force or the eigenfrequency one can determine the flexural stiffness of a beam on the basis of the measured deflection. According to the convention adopted in the literature [ 9 , 15 , 16 , 17 , 18 , 19 , 20 ], the considered quantities are called: static stiffness and dynamic stiffness, respectively. In order to calculate them one can use the basic relations from strength of materials and structural dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…It should be emphasized that currently there is no research on the static and dynamic predispositions (in this case, deflections and eigenfrequencies) of structures strengthened with carbon fiber reinforced polymer (CFRP) strips. Currently, dynamic measurements are used mainly to identify damage to strengthened beams [ 19 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

2021

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This paper presents experimental investigations of reinforced concrete (RC) beams flexurally strengthened with carbon fiber reinforced polymer (CFRP) strips. Seven 3300 mm × 250 mm × 150 mm beams of the same design, with the tension reinforcement ratio of 1.01%, were tested. The beams differed in the way they were strengthened: one of the beams was the reference, two beams were passively strengthened as precracked (series B-I), two beams were passively strengthened as unprecracked (series B-II) and two beams were actively strengthened as unprecracked (series B-III). Moreover, the strengthening parameters differed between the particular series. The parameters were: CFRP strip cross-sectional areas (series B-I, B-II) or prestressing forces (series B-III). The beams were statically loaded, up to the assumed force value, in the three-point bending test and deflections at midspan were registered. After unloading the beams were suspended on flexible ropes (the free-free beam system) and their eigenfrequencies were measured using operational modal analysis (OMA). The static measurements (deflections) and the dynamic measurements (eigenfrequencies) were conducted for the adopted loading steps until failure. Static stiffnesses and dynamic stiffnesses were calculated on the basis of respectively the deflections and the eigenfrequencies. The qualitative and quantitative differences between the parameters are described.

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“…Modal analysis (MA) has been proved to be an effective non-destructive technique to measure vibration properties of engineering structures [3]. Even though MA is strictly a linear technique in principle, it is capable of detecting critical defects by monitoring the changes in the vibration properties [3][4][5], since structural damage of the material results in degradation of stiffness and can cause drops in the dominant natural frequencies.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the failure states of a metal matrix syntactic foam by modal analysis

et al. 2019

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This paper presents a new non-destructive method applying modal analysis to determine the failure state of theAlSi12 matrix syntactic foam containing ceramic hollow spheres. The results proved that the decrease in natural frequencies of the first two modes and the calculated effective Young's modulus indicate the damage state of the syntactic foam's structure during compression. Both the natural frequencies and the elastic modulus start to change after the onset of fracture of hollow spheres, which is ~60MPa, according to our 2 previous work. A 5% decrease in these parameters are suggested as a practical limit of the deterioration of a load-bearing structure, which collides with the maximum in the acoustic emission activity.

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Fundamental Frequency Testing of Reinforced Concrete Beams

Cited by 8 publications

References 4 publications

Determining the Young’s modulus of concrete by measuring the eigenfrequencies of concrete and reinforced concrete beams

Determining the Young’s modulus of concrete by measuring the eigenfrequencies of concrete and reinforced concrete beams

Static and Dynamic Stiffness of Reinforced Concrete Beams Strengthened with Externally Bonded CFRP Strips

Monitoring the failure states of a metal matrix syntactic foam by modal analysis

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