Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Abdel-Jaber, Hiba; Glišić, Branko

doi:10.1177/1475921717751870

Cited by 58 publications

(29 citation statements)

References 23 publications

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“…Regarding relaxation, after the prestress force is applied, the prestressing of the PS steel relaxes and then plateaus over time. These various types of PS losses have a direct and indirect impact on the structures [ 10 , 11 , 12 , 13 ]. In fact, PSC structures such as bridges, nuclear power plants, and roads show rapid deterioration with aging, leading to the possibility of property damage and casualties.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

Kim

Park

et al. 2021

Materials

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A prestressed concrete (PSC) structure is subject to prestress losses in the long and short terms, and the structure ages over time. The structure is susceptible to corrosion from exposure to environmental factors such as moisture, chloride, and carbonation, thus causing prestress loss. Therefore, strengthening the structure is needed to address this problem. Here, the near surface mounted (NSM) method and the external prestressing (EP) method were selected because they are capable of applying additional prestressing. Further, we used fiber-reinforced plastics or polymers, or carbon fiber-reinforced plastics or polymers because of their high tensile strength and noncorrosive properties. For EP tests, prestressed strands were used. Accordingly, this study performs four-point flexural tests and evaluations for 12 types of specimens fabricated with different PSC methods. All specimens fabricated with the NSM (prestressing, no prestressing) and EP methods achieved stiffness that was 50–60% higher than that of the control PSC specimen. It was observed that the EP method in conjunction with prestressing yielded the best strengthening effect. It is expected that the results of this study will be applied to real structures for strengthening them and improving their performances.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

Kim

Park

et al. 2021

Materials

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“…After the construction, the prestress force is gradually decreased over time due to multiple reasons such as creep and shrinkage of concrete and relaxation/corrosion of prestressed strands. Long‐term measurement shows that the loss of the prestress force of a post‐tensioned concrete structure could reach up to 7.7% during 7 years after being constructed . When the prestress force drops under an assured threshold, tensile stress increase in concrete would result in cracks or excessive deformations.…”

Section: Introductionmentioning

confidence: 99%

Damage‐sensitive impedance sensor placement on multi‐strand anchorage based on local stress variation analysis

Dang

Huynh

Pham

et al. 2020

Struct Control Health Monit

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Summary An important issue in impedance‐based damage monitoring is to deploy sensors in proper positions in which damage‐sensitive impedance responses can be captured effectively. In this study, a full‐scale multi‐strand anchorage is analyzed to determine optimal locations of piezoelectric sensors for impedance‐based monitoring of locally damaged strands. First, stress variations of the multi‐strand anchorage are experimentally measured to estimate the anchorage behavior under the effect of locally damaged strands. Strain signals are examined for axial, circumferential, and radial stress components under the variation of prestress forces. Second, a finite element analysis is made on the multi‐strand anchorage to back up the experimental findings. Third, a damage‐sensitive structural model is interpreted for the local strand breakage. Finally, impedance responses sensitive to local strand breakage are experimentally examined for a few scenarios simulated in the anchorage system. PZT (lead zirconate titanate) sensors deployed on the anchor head and the bearing plate are evaluated to comparatively determine ideal regions of interest for impedance monitoring. The results show that the greater stress variation yields the greater variations in impedance responses and the near‐top and near‐anchor heads are ideal regions of interest for damage‐sensitive impedance monitoring.

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“…Most of the SHM systems are installed on bridges that are either irregular or have large spans 3,4 . However, short‐ and medium‐span bridges dominate globally, in both quantity and the degree of damage 5,6 . In the United States, about 60% of highway bridges are beam bridges, of which 70% are classified as dangerous bridges 7 .…”

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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Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Cited by 58 publications

References 23 publications

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

Experimental Evaluation of PSC Structures from FRP with a Prestressing Strengthening Method

Damage‐sensitive impedance sensor placement on multi‐strand anchorage based on local stress variation analysis

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

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