Development of rapid, reliable and economical methods for inspection and monitoring of highway bridges

Fasl, Jeremiah; Helwig, Todd A.; Wood, Sharon L.; Samaras, Vasileios; Yousef, Ali; Frank, Karl H.; Potter, David; Lindenberg, Richard

doi:10.1201/b10430-55

Cited by 6 publications

(4 citation statements)

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“…This has also been observed in other studies. 24,29,30 The upper tail of the histogram (see Figure 11(b)) is associated with the passage of heavily loaded Class 5 and 6 vehicles.…”

Section: Determination Of Stress Ranges and Performance Indicatormentioning

confidence: 99%

Regression models for structural health monitoring of welded bridge joints based on temperature, traffic and strain measurements

Farreras-Alcover

Chryssanthopoulos

Andersen

2015

Structural Health Monitoring

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A modelling platform based on regression analysis is developed as a novel approach to structural health monitoring of welded joints of orthotropic bridge steel decks. Monitoring outcomes from the Great Belt Bridge (Denmark) are used to develop regression models following a weighted least squares approach to characterize the normal correlation pattern between environmental conditions (daily-averaged pavement temperatures), operational loads (daily-aggregated heavy traffic counts) and a strain-based performance indicator. The developed models can be used within a structural health monitoring–based asset management framework for performance assessment (i.e. diagnosis of structural performance changes) and performance prediction (i.e. prognosis of structural performance leading to service life estimates). The main novelty of the work presented consists of the development of an algorithm based on statistical control charts related to the prediction bands of the regression models. The algorithm enables the interpretation of new monitoring data and the identification of potentially abnormal behaviours via outlier detection, as part of an envisaged ‘real-time’ performance assessment application. The proposed approach to outlier detection through structural health monitoring is finally illustrated considering actual monitoring outcomes from the bridge. This highlights the applicability of the developed modelling platform and contributes to bridging the gap between monitoring data and monitoring-based information that can lead to more effective asset management decisions

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“…This has also been observed in other studies. 24,29,30 The upper tail of the histogram (see Figure 11(b)) is associated with the passage of heavily loaded Class 5 and 6 vehicles.…”

Section: Determination Of Stress Ranges and Performance Indicatormentioning

confidence: 99%

Regression models for structural health monitoring of welded bridge joints based on temperature, traffic and strain measurements

Farreras-Alcover

Chryssanthopoulos

Andersen

2015

Structural Health Monitoring

View full text Add to dashboard Cite

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“…The research team collected strain data for 71 days at an effective scan rate of 50 Hz. Strain histories were analyzed in 30-min segments to minimize the errors associated with temperature drift (Fasl et al, 2010). A minimum cycle amplitude of 2 microstrain (0.06 ksi) was used when processing the data to avoid counting cycles attributed to electromechanical noise within the data acquisition system.…”

Section: Measured Response Of Bridgementioning

confidence: 99%

Evaluating Accumulation of Fatigue Damage in Steel Bridges Using Measured Strain Data

Fasl,

Helwig,

Wood

et al. 2015

Eng J

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As traffic volumes increase, bridges age, and maintenance budgets are cut, transportation officials often need quantitative data to distinguish between bridges that can be kept safely in service and those that need to be replaced or retrofitted. Strain gages can be utilized to evaluate fatigue damage in steel bridges using the techniques that are discussed in this paper. To evaluate fatigue damage, the cycles induced by vehicular traffic must be quantified using a cycle-counting algorithm, such as a rainflow algorithm. The amount of fatigue damage induced during the monitoring period can then be calculated using the traditional method, the effective stress range, or using a new approach based on the index stress range. One distinct advantage of the proposed method is that the relative amount of fatigue damage accumulated at different locations along the bridge can be easily compared. The advantages and limitations of both methods are demonstrated using measured data from a fracture-critical steel bridge.

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“…As such, a series of wireless tests was conducted to evaluate communication issues of the current generation of wireless systems inside steel bridges. The results from communication tests inside steel box girders are presented in Fasl et al (11).…”

Section: Field Studiesmentioning

confidence: 99%

“…Initial communication tests with Wi-Fi and WSN devices, as presented in Fasl et al, showed promising results (11). To further understand the radio frequency (RF) environment in a steel box girder, a spectrum analyzer was used at the 120-ft (36.6-m) twin box girder bridge in the Ferguson Structural Engineering Laboratory (FSEL) at UT's J. J. Pickle Research Campus.…”

Section: Ferguson Structural Engineering Laboratory Bridge (Austin)mentioning

confidence: 99%

Evaluation of Wireless Devices for Monitoring Fracture-Critical Steel Bridges

Fasl

Helwig

Wood

et al. 2010

Transportation Research Record: Journal of the Transportation R

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Highway bridges are vital links in the U.S. transportation network, providing the public with routes for daily commutes and businesses with the infrastructure needed to supply goods and services. Identifying possible safety problems in the approximately 600,000 bridges across the country generally is accomplished through labor-intensive visual inspections. The National Bridge Inspection Program requires that bridges be inspected at least once every 2 years. Pending legislation spurred by the collapse of the I-35W steel truss bridge in Minneapolis, Minnesota, would increase the inspections for fracture-critical bridges to once a year and likely strain department of transportation resources that are already stretched to the limit. This paper outlines ongoing research sponsored by the National Institute of Standards and Technology that seeks to improve inspection practices by providing the technology and methodology for real-time monitoring of steel bridges. The first generation of two wireless systems (one based on IEEE 802.11 and another on IEEE 802.15.4) from National Instruments has been evaluated in field conditions. This paper presents results of a study to characterize wireless communication in steel box girders and I-girders. In addition, enhancements to be made in the second generation are discussed.

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Development of rapid, reliable and economical methods for inspection and monitoring of highway bridges

Cited by 6 publications

References 0 publications

Regression models for structural health monitoring of welded bridge joints based on temperature, traffic and strain measurements

Regression models for structural health monitoring of welded bridge joints based on temperature, traffic and strain measurements

Evaluating Accumulation of Fatigue Damage in Steel Bridges Using Measured Strain Data

Evaluation of Wireless Devices for Monitoring Fracture-Critical Steel Bridges

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