Dynamically loaded concrete structures – monitoring‐based assessment of the real degree of fatigue deterioration

Urban, Susanne; Strauß, Alfred; Schutz, Robert W.; Bergmeister, Konrad; Dehlinger, Christian

doi:10.1002/suco.201300095

Cited by 11 publications

(14 citation statements)

References 8 publications

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“…The measurement results confirm that the ultrasonic velocity tends to decrease with the number of load cycles applied. In contrast to the results presented in [11], the percentage decrease in dynamic stiffness and secant modulus are of the same magnitude. However, specimens were not loaded to failure.…”

Section: Literature Review 21 Crack Propagation and Stiffness Degradcontrasting

confidence: 99%

“…The shape of the curve is similar to that of the curve of the secant modulus. This similarity has also been reported in [2], [11] and [13]. The initial ultrasonic velocity of the longitudinal wave was about c p ≈ 4100 m/s.…”

Section: Development Of the Secant Modulussupporting

confidence: 89%

“…This assumption is not valid for fatigue-loaded concrete specimens, which show a disproportional increase in Poisson's ratio and crack propagation in the third phase of the damage process. In [11] the dynamic stiffness was determined by assuming a constant Poisson's ratio and density irrespective of the number of load cycles to failure. The dynamic stiffness decreased to 13 % of its initial value.…”

Section: Literature Review 21 Crack Propagation and Stiffness Degradmentioning

confidence: 99%

“…The discrepancies might be due to the different measurement techniques (indirect transmission measurement in direction of loading versus direct transmission measurement orthogonal to direction of loading). On the other hand, only the results of the ultrasonic measurements are documented in [11]. In [2] the specimens were not loaded to failure; hence, a comparison of the ultrasonic velocity and stiffness degradation during the third phase of the damage process is not possible.…”

Section: Experimental Investigations 31 Objectivementioning

confidence: 99%

“…In [11] ultrasonic velocity measurements were performed on fatigue loaded concrete specimens of strength class C80/95. Indirect transmission measurements were carried out in the direction of loading.…”

Section: Ultrasonic Investigations Of Fatigue Loaded Concrete Specimensmentioning

confidence: 99%

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Development of stiffness and ultrasonic pulse velocity of fatigue loaded concrete

Haar

Marx

2016

Structural Concrete

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Damage processes in dynamically loaded concrete structures depend on the number and amplitude of applied load cycles. Damage evolution is linked to a reduction in concrete stiffness, and it is thought that this reduction causes stress redistributions at the component level, which have a favorable impact on the service life of the structure. Until now, the stiffness reduction and stress redistribution have never been successfully measured in laboratory tests or in situ. It is only known that the real service life is greater than the calculated one and that indicators of stiffness reduction, such as the component deflection, increase with the number of applied load cycles.Ultrasonic measurement techniques are considered to be well suited for detecting degradation processes caused by dynamic loading. By using ultrasonic pulse velocity measurements, it is expected that the stiffness reduction of dynamically loaded concrete structures can be recorded reliably. Against this background, fatigue tests on small-scale concrete specimens were performed. The aim of the tests was to understand the correlation Accepted Article www.ernst-und-sohn.de Page 2Structural Concrete between the observed stiffness degradation of the specimens and the results of ultrasonic pulse velocity measurements and to estimate the potential of ultrasonic pulse velocity measurements for continuous structural health monitoring.

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Section: Literature Review 21 Crack Propagation and Stiffness Degradcontrasting

confidence: 99%

Section: Development Of the Secant Modulussupporting

confidence: 89%

Section: Literature Review 21 Crack Propagation and Stiffness Degradmentioning

confidence: 99%

Section: Experimental Investigations 31 Objectivementioning

confidence: 99%

Section: Ultrasonic Investigations Of Fatigue Loaded Concrete Specimensmentioning

confidence: 99%

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Development of stiffness and ultrasonic pulse velocity of fatigue loaded concrete

Haar

Marx

2016

Structural Concrete

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Evaluation of the mechanical parameters of a reinforced concrete dam based on multi‐source data

Huang

Xie

et al. 2022

Structural Concrete

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In this research, we studied a roller‐compacted concrete (RCC) arch dam which was reinforced during the construction period to investigate the properties of mechanical parameters of the dam concrete after long‐term operation. Firstly, multiple methods involving core drilling, computerized tomography (CT), spectral analysis of the surface wave (SASW) of elastic waves, and an on‐site inspection were adopted to detect the quality of the dam concrete, which was followed by a forward‐analysis of the measured displacement of the arch dam and the water pressure component of the measured displacement was separated through regression analysis of statistical model of radial horizontal displacement. Subsequently, an optimization inversion of the elastic modulus of the dam body and dam foundation was conducted using a hybrid optimization method. The results showed that the compressive strength of the concrete in the body of the reinforced arch dam was over 30 MPa and the inversion results for the elastic modulus of the dam body were in the range of 30.1 ~ 33.3 GPa. According to the research results of multi‐source inspected and monitoring data during the operation period, the results suggest that the performance of the concrete of the dam body is in accordance with design requirements and the reinforced arch dam is properly operated.

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Application of Dynamic Elastic Modulus Targeted Testing Methods for Old Concrete Aqueducts

Xiao

et al. 2023

Strength Mater

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Dynamically loaded concrete structures – monitoring‐based assessment of the real degree of fatigue deterioration

Cited by 11 publications

References 8 publications

Development of stiffness and ultrasonic pulse velocity of fatigue loaded concrete

Development of stiffness and ultrasonic pulse velocity of fatigue loaded concrete

Evaluation of the mechanical parameters of a reinforced concrete dam based on multi‐source data

Application of Dynamic Elastic Modulus Targeted Testing Methods for Old Concrete Aqueducts

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