Monitoring of prestressing forces in prestressed concrete structures—An overview

Abdel-Jaber, Hiba; Glišić, Branko

doi:10.1002/stc.2374

Cited by 67 publications

(39 citation statements)

References 81 publications

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“…The classification of some methods is questionable because the line between destructive, semi-destructive, and non-destructive approaches is narrow. In general, methods with no or only minimal impact on the structural integrity are considered non-destructive [ 15 , 16 , 17 , 18 ]. Two main stress releasing methods are available.…”

Section: Introductionmentioning

confidence: 99%

Indirect Determination of Residual Prestressing Force in Post-Tensioned Concrete Beam

et al. 2021

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A diagnostic survey on the precast prestressed bridge Nižná confirmed significant deterioration due to environmental distress. Evidently, decisive failures of the structure have a similar character as in the previous precast prestressed bridge in Podbiel in the northern part of Slovakia. These failures result from the unsuitable concept of the first generation of precast prestressed concrete beams, which was used in the former Czechoslovakia in the second half of the 20th century. Subsequently, experimental verification using the proof-load test was also executed. This bridge was built in 1956, so at the time of testing, it was 60 years old. The paper presents the indirect determination of prestressing level in one precast post-tensioned concrete beam using the saw-cut method. Experimental measurement was executed during the bridge demolition. Subsequently, a 2D numerical model in ATENA 2D Software, with the assumption of nonlinear material behavior for verification of experimental results, was performed. Finally, the residual prestressing force was evaluated and compared with the expected state of prestressing according to Eurocodes after 60 years of service.

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Section: Introductionmentioning

confidence: 99%

Indirect Determination of Residual Prestressing Force in Post-Tensioned Concrete Beam

et al. 2021

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“…14,15 Extensive SHM techniques have been applied to identify the presence, location, and severity of structural damage. [16][17][18][19] These techniques have been proposed by using various damage sensing features and diverse sensors. The existing damage indicators can be categorized as static [20][21][22] and dynamic.…”

Section: Introductionmentioning

confidence: 99%

“…These should be sensitive to the local damage and insensitive to the ambient noise 14,15 . Extensive SHM techniques have been applied to identify the presence, location, and severity of structural damage 16–19 . These techniques have been proposed by using various damage sensing features and diverse sensors.…”

Section: Introductionmentioning

confidence: 99%

Long‐term performance monitoring and assessment of concrete beam bridges using neutral axis indicator

Xia

Lei

Wang³

et al. 2020

Struct Control Health Monit

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Long-term performance of existing bridge structures provides stakeholders with information that facilitates decision making for reasonable and optimal maintenance and management. The neutral axis (NA) is a potentially reliable and robust indicator to evaluate bridge performance since it depends on the loss of elastic modulus or effective sectional area. In this study, the NA indicator is defined and derived, and it is combined with the statistical characteristics of the NA distribution, to assess long-term structural performance. A systematic long-term performance assessment framework based on NA is also proposed. The NA is estimated from strain measurements and related practical signal processing methods. To validate the proposed framework, strain signals acquired from a preinstalled structural health monitoring system on an existing concrete beam bridge were analyzed. For the long-term performance assessment, an NA database was established. The statistical characteristics of the NA sample in the daily evaluation cycle were obtained to evaluate the performance. The results show that different cross sections have their own estimated NA; and during the monitoring period, the NA indicators fluctuate within a reasonable range. With the increase of monitoring data, these results can be continually updated. It can be concluded that the proposed NA indicator, along with the related framework, can be employed effectively in the condition assessment of concrete box girder bridges for long-term health monitoring.

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“…The growing interest in SHM for infrastructure operators and the recent technological progress have encouraged the research community to study and develop innovative sensors and monitoring methods. An incomplete list includes the Ground Penetration Radar (GPR), or Georadar [ 6 , 7 ], the Reflectometric Impulse Measurement Technology (RIMT) [ 8 , 9 , 10 ], the Time Domain Reflectometry (TDR) [ 11 , 12 ], the Strand-Cutting test [ 13 , 14 , 15 ], the Core Drilling Method (CDM) [ 16 , 17 ], and the Acoustic Emissions technique (AE) [ 18 ]. All these techniques have been studied in laboratory experiments and in-service structure monitoring; however, the absence of standardized procedures and the unavoidable need of experts to interpret results make these technologies unready for an extensive application on civil infrastructure yet.…”

Section: Introductionmentioning

confidence: 99%

Structural Health Monitoring Based on Acoustic Emissions: Validation on a Prestressed Concrete Bridge Tested to Failure

Tonelli

Luchetta

Rossi

et al. 2020

Sensors

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The increasing number of bridges approaching their design life has prompted researchers and operators to develop innovative structural health monitoring (SHM) techniques. An acoustic emissions (AE) method is a passive SHM approach based on the detection of elastic waves in structural components generated by damages, such as the initiation and propagation of cracks in concrete and the failure of steel wires. In this paper, we discuss the effectiveness of AE techniques by analyzing records acquired during a load test on a full-size prestressed concrete bridge span. The bridge is a 1968 structure currently decommissioned but perfectly representative, by type, age, and deterioration state of similar bridges in operation on the Italian highway network. It underwent a sequence of loading and unloading cycles with a progressively increasing load up to failure. We analyzed the AE signals recorded during the load test and examined how far their features (number of hits, amplitude, signal strength, and peak frequency) allow us to detect, quantify, and classify damages. We conclude that AE can be successfully used in permanent monitoring to provide information on the cracking state and the maximum load withstood. They can also be used as a non-destructive technique to recognize whether a structural member is cracked. Finally, we noticed that AE allow classifying different types of damage, although further experiments are needed to establish and validate a robust classification procedure.

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Monitoring of prestressing forces in prestressed concrete structures—An overview

Cited by 67 publications

References 81 publications

Indirect Determination of Residual Prestressing Force in Post-Tensioned Concrete Beam

Indirect Determination of Residual Prestressing Force in Post-Tensioned Concrete Beam

Long‐term performance monitoring and assessment of concrete beam bridges using neutral axis indicator

Structural Health Monitoring Based on Acoustic Emissions: Validation on a Prestressed Concrete Bridge Tested to Failure

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