Japan's experience on long-span bridges monitoring

Fujino, Yozo; Siringoringo, Dionysius M.; Abé, Masato

doi:10.12989/smm.2016.3.3.233

Cited by 18 publications

(13 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Structural assessment of existing stay cables is essential to ensure that their conditions are within the acceptable limits for safety and serviceability. Tension estimation of in‐service stay cables is among the primary concerns of structural health monitoring of cable‐stayed bridge 1 . Currently, the available techniques for cable monitoring can be broadly classified into three categories: (1) static and direct method that directly measures the tension using pre‐installed load cells, fiber‐optics, 2 or by the lift‐off hydraulic jacks; (2) the magnetic method based on the magnetic permeability measurement; and (3) the dynamic method using vibration measurement 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Tension estimation of in-service stay cables is among the primary concerns of structural health monitoring of cable-stayed bridge. 1 Currently, the available techniques for cable monitoring can be broadly classified into three categories: (1) static and direct method that directly measures the tension using pre-installed load cells, fiber-optics, 2 or by the lift-off hydraulic jacks; (2) the magnetic method based on the magnetic permeability measurement; and (3) the dynamic method using vibration measurement. 3 In the first category, the pre-installed calibrated load cell is used to monitor the tension.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

Wangchuk

Siringoringo

Fujino

2022

Structural Contr & Hlth

Self Cite

View full text Add to dashboard Cite

Summary This paper describes a study on modal analysis and tension estimation of stay cables by vision‐based measurement under ambient condition. Microvibration of stay cable is captured by video camera, and the amplitude is amplified using phase‐based video motion magnification method. From the sequences of cable images, spatial displacements of the cable are extracted via discretized centroid searching method. Modal parameters of the cable, namely, natural frequency, damping ratio, and mode shape, are identified by dynamic mode decomposition method from cable displacement responses. Furthermore, tension of the stay cable is estimated based on the identified natural frequencies by minimizing an error function of an approximate relationship between frequency and tension iteratively. The technique is verified in the laboratory‐scale experiments and implemented to full‐scale measurement of medium size and long‐span cable‐stayed bridges. To compare the accuracy and efficacy of the vision‐based method, noncontact vibration measurement using laser Doppler vibrometer was also conducted. The results demonstrate that the proposed vision‐based vibration measurement techniques can estimate modal parameters and tension of the stay cables accurately in a noncontact and distant measurement under ambient condition. The proposed method offers an alternative of effective and accurate vibration measurement of stay cables using only motion of the cables recorded by video camera.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

Wangchuk

Siringoringo

Fujino

2022

Structural Contr & Hlth

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years, a great deal of research has focused on the structural health monitoring (SHM) technique [1][2][3][4]. To ensure structural safety during its service life, the SHM system (SHMS) has been designed and implemented on many important bridges in the United States [5][6][7], Europe [8][9][10][11][12], Canada [13,14], Korea [15][16][17], and Japan [18][19][20]. In China, the SHMS has been implemented on a large number of long-span bridges [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Overview of integrated health monitoring system installed on cable-stayed bridge and preliminary analysis of results

2021

JCE

View full text Add to dashboard Cite

The Junshan Yangtze River Bridge, built in Wuhan, China in 2001, is a steel box girder cable-stayed bridge with a main span of 460m. Due to decades of service, the bridge suffered gradual degradation and some damage. Structural health monitoring has attracted worldwide attention due to its capacity of monitoring structural damage, assisting maintenance and management, and ensuring safe operation of bridges. To monitor the performance status of bridges and generate a timely safety alarm, an integrated health monitoring system has been designed and implemented on bridges. This paper provides a thorough account of the monitoring system used at the Junshan Yangtze River Bridge. It mainly focuses on the selection of monitoring variables and arrangement of sensor points, the data collection and transmission system, the data storage and management strategy, and the user interface system. All kinds of monitoring data collected under daily operation, such as vehicle load, deflection, displacement, and cable tension, are analysed. Monitoring data for an extreme condition, which involves two heavy trucks of 178 tons moving across the bridge, are also analysed. The results indicate that the monitoring system works well and that some local welded joints may experience fatigue damage.

show abstract

“…The major roles of sleepers are (i) to transfer wheel loads from the superstructure to the substructure and (ii) to secure the gauge between rails for safe passages of trains. In reality, wheel/rail interactions over common defects in either a wheel or a rail can cause severe impact loading conditions (Remennikov and Kaewunruen, 2005;Kaewunruen, 2014;Remennikov and Kaewunruen, 2015;Kaewunruen and Remennikov, 2008a,b,c;Remenikov and Kaewunruen, 2008;Remennikov et al, 2011;Fujino and Siringoringo, 2016;Kaewunruen et al, 2016a;Yahiaoui et al, 2017). The impact loads can significantly undermine structural integrity and durability of railway sleepers over the time.…”

Section: Introductionmentioning

confidence: 99%

Parametric Studies Into Creep and Shrinkage Characteristics in Railway Prestressed Concrete Sleepers

Kaewunruen

Robery

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

It is well known that prestressed concrete is highly suitable for railway sleepers because of its many advantages in performance, maintenance, sustainability, and construction. Prestressed concrete design can improve structural performance since the prestress enables fully compressed cross sections. Higher tensile resistance of prestressed concrete can then take place. However, longer-term performance and durability of concrete sleepers largely depends on creep and shrinkage behaviors. On this ground, the effects of time-dependent phenomena on prestressed concrete sleeper are investigated in this study. In the past decades, a number of material models have been established to estimate creep and shrinkage behavior, but those were mostly based on a generic reinforced concrete design concept. The common uses of prestressed concrete have led to practical concerns by practitioners whether those existing predictive models could be realistically applied to prestressed concrete applications. Due to a relatively higher initial elastic shortening in prestressed concrete, the creep and shrinkage effects should be critically reevaluated among flexural members. This study embarks on comparative studies into the effects of creep and shrinkage on prestressed concrete railway sleepers. A thorough comparison between prediction models underpinned by European Standard Eurocode 2, American Standard ACI, and Australian Standard AS3600-2009 enables new insights into the time-dependent performance of railway concrete sleepers installed in various locations or in different continents. This implies that the durability of railway concrete sleepers can be undermined differently when exposed to different conditions even in the same rail network. The insights stemmed from this study will help track engineers to better design and maintain railway infrastructure, improving asset management efficacy.

show abstract

Japan's experience on long-span bridges monitoring

Cited by 18 publications

References 22 publications

Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

Modal analysis and tension estimation of stay cables using noncontact vision‐based motion magnification method

Overview of integrated health monitoring system installed on cable-stayed bridge and preliminary analysis of results

Parametric Studies Into Creep and Shrinkage Characteristics in Railway Prestressed Concrete Sleepers

Contact Info

Product

Resources

About