Impact of Heavy Freight Railcar on the Remaining Fatigue Life of                    Centenarian Railway Bridges

Lou, Peng; Nassif, Hani; Su, Dan

doi:10.1061/(asce)be.1943-5592.0001128

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…These sensors are easy to install with no dependence on a fixed reference point other than their own (stable) location. Access to a test structure is sometimes still either necessary or recommended for the installation of assistant tools such as reflective tapes for LDVs (Lou et al 2017), reflective prisms for RTS (Brownjohn et al 2015) and artificial targets for vision-based systems (Xu et al 2016). Vision-based systems and radar interferometry both support multi-point simultaneous sensing, approaching true deformation monitoring, while distributions of test points in microwave interferometry systems are dependent on range resolution and less flexible.…”

Section: Review Of Displacement Sensing Techniquesmentioning

confidence: 99%

Accurate Deformation Monitoring on Bridge Structures Using a Cost-Effective Sensing System Combined with a Camera and Accelerometers: Case Study

Brownjohn

Huseynov

2019

J. Bridge Eng.

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Information on deformation is critical for bridge condition evaluation but accurate characterisation, usually via discrete displacement measurements, remains a challenging task. Vision-based systems are promising tools, possessing advantages of easy installation, low cost and adequate resolution in time and frequency domains. However, vision-based monitoring faces several field challenges and might fail to achieve the required level of working performance in some real-world test conditions e.g. involving low-contrast patterns and mounting instability of optical sensors. To make the best use of the potential of vision-based systems, a mixed sensing system consisting of a consumer-grade camera and an accelerometer is proposed in this study for accurate displacement measurement. The system considers automatic compensation of camera shake and involves autonomous data fusion process for noise reduction. The proposed system is demonstrated through a field monitoring test on a short-span railway bridge and is validated to offer higher accuracy and wider frequency range than using a camera alone. Displacement data by the mixed system are demonstrated to be viable for estimating bridge influence line, indicating the potential for bridge condition assessment.

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Section: Review Of Displacement Sensing Techniquesmentioning

confidence: 99%

Accurate Deformation Monitoring on Bridge Structures Using a Cost-Effective Sensing System Combined with a Camera and Accelerometers: Case Study

Brownjohn

Huseynov

2019

J. Bridge Eng.

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“…In this context, bridges play an important role due to its responsible for crossing obstacles and connecting places (Gonzalez et al, 2019). Researchers around the world have been conducting studies about the phenomenon of fatigue in road bridges and viaducts (Pimentel, Bruhwiler e Figueiras, 2008;Baroni, 2010;Pircher et al 2011;Albuquerque, Pfeil, 2012;Zhang, Xin, Cui, 2012;Osumeje et al 2016;Junges, 2017;Deng, Yan, 2018;Braz et al 2018, LU et al, 2017Liu ,Zhou, 2018;Lou;Nassif;Su, 2017;Alencar et al, 2018;, Hassen, 2020, Pillai, Talukdar, 2020. Those studies are justified by the relevance of these structures in the flow of people, products and goods; the high age of the bridges and viaducts; and the heterogeneity of freight vehicles that commute in railways.…”

Section: Introductionmentioning

confidence: 99%

Fatigue design in reinforced concrete bridges according to Brazilian code

Mascarenhas

Christofóro

Filho

et al. 2021

Int J Innov Educ Res

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There has been an increase in the flow of freight vehicles commuting on Brazilian highways. Then, special attention to the structural performance of bridges regarding the fatigue in beams is needed. Brazil has neither normative metrology to study real data flow of vehicles, nor specific fatigue load train models and coefficients to the analysis and design of road bridges. The same load train that is used for general dimensioning, TB 450, is used for the fatigue verification. Hence, this work aims to verify if the current TB 450 is representative of the freight heavy vehicles with 2 to 9 axles concerning the effects of fatigue in the longitudinal reinforcement of beams of theoretical reinforced concrete bridges with two, three, and five beams. This verification is performed analyzing the stress variations found in the longitudinal reinforcement of vehicles with 2 to 9 axles and the TB 450. Based on the results, the longitudinal steel reinforcement was more susceptible to fatigue's effects. Freight vehicles with 5, 6, 8 and 9 axles presented the most significant stress, therefore, they tend to cause more deleterious effects. Hence, the adoption of a Brazilian normative fatigue specific load train and coefficients is necessary to analyze pre-existing road bridges and design new ones most accurately.

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“…Although many existing bridges are structurally adequate to carry the truck platoons, fatigue of steel bridges is another critical concern related to the cyclical applications of the truck platoons. Lou et al developed a probabilistic approach for fatigue evaluation of steel railway bridges with new resistance model ( 5 ).…”

mentioning

confidence: 99%

Truck Platooning to Minimize Load-Induced Fatigue in Steel Girder Bridges

Braguim

Lou

Nassif

2020

Transportation Research Record: Journal of the Transportation R

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Truck platooning has been demonstrated to possess several advantages in relation to energy savings. To implement this technology in the future, a better understanding of the effects of truck platooning on bridges is needed in relation to safety, serviceability, and remaining service life. This research aims at investigating the effects of truck platooning on the fatigue of steel girder bridges. Different types of platoons are simulated in line girder analysis for simple spans and two-equal continuous spans bridges. Then the rainflow counting method is applied to obtain the stress ranges and cycles. Miner’s rule is used to quantify the fatigue damage. The fatigue damage of different platoons is normalized by American Association of State Highway Transportation Officials Load and Resistance Factor Design Fatigue Load for comparison. The effects of the number of trucks and gap distances of truck platoons are further investigated. In some cases, truck platooning helps decrease the fatigue damage since, although truck platooning brings higher load effects, it also decreases the number of cycles. For platoons with different truck wheelbases, there are specific span to wheelbase ratios, beyond which fatigue damage decreases as gap distance increases. In addition, depending on the platoon configurations, there are ranges of span lengths where it is more beneficial to travel as truck platoons rather than traveling individually in relation to fatigue damage.

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Impact of Heavy Freight Railcar on the Remaining Fatigue Life of Centenarian Railway Bridges

Cited by 6 publications

References 24 publications

Accurate Deformation Monitoring on Bridge Structures Using a Cost-Effective Sensing System Combined with a Camera and Accelerometers: Case Study

Accurate Deformation Monitoring on Bridge Structures Using a Cost-Effective Sensing System Combined with a Camera and Accelerometers: Case Study

Fatigue design in reinforced concrete bridges according to Brazilian code

Truck Platooning to Minimize Load-Induced Fatigue in Steel Girder Bridges

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