Deflection-based multilevel structural condition assessment of long-span prestressed concrete girder bridges using a connected pipe system

Zhou, Junyong; Sun, Zhuo; Wei, Bin; Zhang, Liwen; Zhang, Pan

doi:10.1016/j.measurement.2020.108352

Cited by 35 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A twodeflection level threshold approach was developed to determine static and dynamic deflections. More recently, Zhou et al (2021) presented an improved LLS to monitor bridge deflections by considering the individual contribution of traffic-induced vibration, temperature variations, and long-term deformation. The proposed LLS was implemented on a PSCB located in the Guangdong province in China.…”

Section: Deflection Monitoring Of Pscbsmentioning

confidence: 99%

“…The bridge having two main spans of 160 m, was opened to traffic in 1996, but during an inspection in 2014, structural problems such as concrete cracking, water seepage, and crystallization in several segment junctions were detected. Zhou et al (2021) concluded that long-term deflections exceeded design specifications. Niu & Tang (2019), using deflection monitoring data from a PSCB, successfully demonstrated that traffic-induced vibration, temperature variations, and long-term deformation could be separated based on the corresponding distinctively features in the frequency domain.…”

Section: Deflection Monitoring Of Pscbsmentioning

confidence: 99%

“…Based solely on average deflection values is not possible to assure potential risk in the future for the Pujamanes bridge. Therefore, the bridge deflection-based multilevel long-term deflection assessment developed by Zhou et al (2021) is adopted to study the current deflection situation of the Pujamanes bridge. This assessment framework considers that a combination of not well-understood factors causes long-term deflection, and large deviations in model predictions are related to a complicated mechanism.…”

Section: Long-term Deflection Analysismentioning

confidence: 99%

See 2 more Smart Citations

Long-term deformation assessment of a long-span concrete bridge built by the cantilever erection method

Rincon

Viviescas

Osorio

et al. 2022

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

The balanced cast-in-place cantilever erection method has become a popular construction bridge technique. The main advantages include an industrialized erection technique that prevents the use of intermediate supports and rapid construction. However, the long-term response of this bridge typology is not well understood as long-term deflections due to time-dependent phenomena (such as creep and shrinkage) are significantly simplified in bridge design codes. Existing prediction models commonly used in design tend to underestimate long-term deflections, and as a result, field measurements conducted in newly constructed bridges still report excessive long-term deflections. This paper shows the long-term deflection analysis of a long-span concrete bridge located in Colombia and opened to traffic in 2014. This study is conducted using field data collected within a one-year time interval and modelling results. Further comparisons using field data collected from bridges with similar structural configurations, but opened to traffic in the 90s and 2000s, show that the bridge's current situation is categorized as a major concern.

show abstract

Section: Deflection Monitoring Of Pscbsmentioning

confidence: 99%

Section: Deflection Monitoring Of Pscbsmentioning

confidence: 99%

Section: Long-term Deflection Analysismentioning

confidence: 99%

See 1 more Smart Citation

Long-term deformation assessment of a long-span concrete bridge built by the cantilever erection method

Rincon

Viviescas

Osorio

et al. 2022

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

show abstract

“…For example, the Association of State Highway and Transportation Officials (AASHTO) standard suggested that the threshold for the traffic-induced deflection should be L /800, where L is the span length in meter. 8 The Korean railway bridge guidelines set the allowable maximum deflections to L /1900 of a bridge girder with span length of 40 m for high-speed train. 9 Similarly, An et al (2017) developed the constant warning threshold for the transverse dynamic displacement changes against temperature.…”

Section: Introductionmentioning

confidence: 99%

Sensor data-based probabilistic monitoring of time-history deflections of railway bridges induced by high-speed trains

Lee

Jeong

Sim

et al. 2022

Structural Health Monitoring

View full text Add to dashboard Cite

Structural condition monitoring of railway bridges has been emphasized for guaranteeing the passenger comfort and safety. Various attempts have been made to monitor structural conditions, but many of them have focused on monitoring dynamic characteristics in frequency domain representation which requires additional data transformation. Occurrence of abnormal structural responses, however, can be intuitively detected by directly monitoring the time-history responses, and it may give information including the time to occur the abnormal responses and the magnitude of the dynamic amplification. Therefore, this study suggests a new Bayesian method for directly monitoring the time-history deflections induced by high-speed trains. To train the monitoring model, the data preprocessing of speed estimation and data synchronization are conducted first for the given training data of the raw time-history deflection; the Bayesian inference is then introduced for the derivation of the probability-based dynamic thresholds for each train type. After constructing the model, the detection of the abnormal deflection data is proceeded. The speed estimation and data synchronization are conducted again for the test data, and the anomaly score and ratio are estimated based on the probabilistic monitoring model. A warning is generated if the anomaly ratio is at an unacceptable level; otherwise, the deflection is considered as a normal condition. A high-speed railway bridge in operation is chosen for the verification of the proposed method, in which a probabilistic monitoring model is constructed from displacement time-histories during train passage. It is shown that the model can specify an anomaly of a train-track-bridge system.

show abstract

“…Concrete has become the most widely used material in the world [12][13][14][53][54][55][56][57][58][59][60][61][62][63][64][65]. Since concrete is always alkaline, the service life of concrete structures would be shortened when exposed to acidic conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Composition of Fine Aggregate on the Frictional Behavior of Concrete–Soil Interface under Sulfuric Acid Environment

Xiao

Murong

et al. 2021

Fractal Fract

View full text Add to dashboard Cite

Through direct shear tests, this paper aimed to research the effect of fine marble aggregate on the shear strength and fractal dimension of the interface between soil and concrete corroded by sulfuric acid. More realistic concrete rough surfaces than the artificially roughened surfaces were formed by immersing four concrete plates in plastic buckets filled with sulfuric acid for different periods of time. The sand was adopted to imitate the soil. 3D laser scanner was employed to obtain the digital shapes of concrete plates subjected to sulfuric acid, and the rough surfaces were evaluated by fractal dimension. Large direct shear experiments were performed to obtain the curves of the interface shear stress and shear displacement between sand and corroded concrete plate. The method of data fitting was adopted to calculate the parameters of shear strength (i.e., friction angle and the cohesive) and the parameters of the Clough–Duncan hyperbolic model. The results indicated that as the corrosion days increased, the surface of the concrete plate became rougher, the surface fractal dimensions of the concrete corroded by sulfuric acid became bigger, and the interface friction angle became greater. The friction angle of the interface and the fractal dimensions of the surface of the concrete plate containing crushed gravel and marble sand were smaller than that of the concrete plate containing crushed gravel and river sand.

show abstract

Deflection-based multilevel structural condition assessment of long-span prestressed concrete girder bridges using a connected pipe system

Cited by 35 publications

References 33 publications

Long-term deformation assessment of a long-span concrete bridge built by the cantilever erection method

Long-term deformation assessment of a long-span concrete bridge built by the cantilever erection method

Sensor data-based probabilistic monitoring of time-history deflections of railway bridges induced by high-speed trains

Effect of Chemical Composition of Fine Aggregate on the Frictional Behavior of Concrete–Soil Interface under Sulfuric Acid Environment

Contact Info

Product

Resources

About