Suspender Replacement Method for Long‐Span Concrete‐Filled Steel Tubular Arch Bridges and Cable Force Measurement Based on Frequency Method

Deng, Yulin; Deng, Luming

doi:10.1155/2021/7308816

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…e layout of the bridge lanes is shown in Figure 3, and the management and maintenance unit in this area has established a dynamic weighing system to record the number of vehicles in the driving lane, vehicle speed, vehicle mass, axle load, axle number, wheelbase, and other parameters. ese basic data can provide an important basis for the fatigue assessment of the bridge and can be used to estimate the service life of the bridge suspenders [22].…”

Section: Vehicle Statistics Of the Dynamic Load-mentioning

confidence: 99%

Vehicle Load Spectrum and Fatigue Vehicle Model of a Long‐Span Concrete‐Filled Steel Tube (CFST) Arch Bridge Based on Measured Data of Weight‐In‐Motion System

Deng

2022

Advances in Civil Engineering

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Highway traffic load, speed, and volume have been increasing continuously over the years. Because of its special structural form, the fatigue problem of a long-span concrete-filled steel tube arch bridge becomes more and more serious. To research the vehicle load spectrum and fatigue vehicle model of a long-span concrete-filled steel tubular arch bridge, the traffic data of the arch bridge were collected using the weight-in-motion system. The vehicle type and vehicle load in the actual traffic flow have strong stochastic characteristics, which cannot be directly applied. Therefore, according to the measured data, 10 representative models are proposed to facilitate the classification and screening of vehicle data. The wheelbase, mass, axle load, and overload data of the representative vehicle types were analysed, and the axle load distribution characteristics of vehicles in different lanes were studied. It is found that the vehicle load is not uniformly distributed in different lanes but concentrated in one lane. Moreover, a vehicle load spectrum for the fatigue assessment of the long-span concrete-filled steel tubular arch bridge is proposed. Based on the fatigue damage equivalence principle, a fatigue vehicle model and a simplified fatigue vehicle model of bridge heavy-duty vehicles are proposed. Compared with the model in the AASHTO specification, it is found that the weight of the local fatigue vehicle load model is 15.1 t heavier than the vehicle model given in the specification. This study could be further referenced in bridge-fatigue life prediction, management and maintenance, etc.

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Section: Vehicle Statistics Of the Dynamic Load-mentioning

confidence: 99%

Vehicle Load Spectrum and Fatigue Vehicle Model of a Long‐Span Concrete‐Filled Steel Tube (CFST) Arch Bridge Based on Measured Data of Weight‐In‐Motion System

Deng

2022

Advances in Civil Engineering

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“…In the management of the complete service life cycle of steel tube concrete arch bridges, the performance of suspenders and the steel wires inside them is a crucial consideration. Previous field surveys have indicated that under the influence of complex stresses, there is a probability of damage to the outer layer sheath of the suspenders, leading to the infiltration of water molecules and causing electrochemical corrosion inside the suspenders [1]. During the service life of a bridge, highly humid areas may develop within the suspender, leading to corrosion of the steel wires.…”

Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Variation Study on Corrosion of High-Strength Steel Wires in the Suspender of CFST Arch Bridge

Deng,

Deng

2024

Coatings

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The corrosion and degradation behavior of high-strength steel wires during service directly affect the safety and usability of suspenders in steel pipe concrete arch bridges. In this study, three different types of specimens were fabricated using steel wires extracted from the suspenders of an 11-year-old in-service arch bridge and subjected to accelerated corrosion tests with acetic acid. Considering the differential diffusion processes of corrosion factors caused by varying degrees of damage to the suspender sheath, the spatial corrosion variability of steel wires at different positions within the suspender cross-section was investigated. Experimental results indicated a two-stage characteristic in the corrosion process of individual galvanized steel wire samples. In the first corrosion stage, the microstructure on the corroded steel wire surface evolved from a dense crystalline structure to a porous one. In the second corrosion stage, corrosion products accumulate on the steel wire substrate, subsequently further aggregating into sheet-like structures. The maximum pitting factor of individual steel wire samples from a specific area could be described by a Type I extreme value distribution. In the time-dependent model that was established, the location parameter and scale parameter exhibited an exponential decrease during the first corrosion stage and a linear decrease during the second corrosion stage. In the absence of sheath protection, the coefficient of variation in corrosion among adjacent steel wires in the suspender followed a normal distribution. The spatial corrosion variability of the wires inside the suspender is significantly influenced by the shape of the suspender sheath damage. As the corrosion time increased, the overall discrepancy in corrosion levels among different layers of wires diminished.

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“…Although the suspender replacement is technically feasible, the repair is expensive [2,3]. The bridge that provided the sample for this experiment also faced the problem of replacing the suspender [4]. Effective corrosion control measures can only delay the corrosion of the suspender [5].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Fatigue Test and Performance Evaluation of High-Strength Steel Wires Based on the Suspender of a 11-Year-Old Concrete-Filled Steel Tube Arch Bridge

Deng

2022

Coatings

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In this study, based on an actual project, the steel wire in the suspender of a concrete-filled steel tube arch bridge was selected from appropriate samples to perform acetic acid-accelerated salt spray tests, and steel wire samples with different corrosion degrees were obtained. A laser microscope was used to measure the roughness of the samples, and three corrosion samples were randomly selected from each group for grinding. Fatigue tests were performed on steel wire samples with different degrees of corrosion and polished steel wire samples, and the fatigue fracture was observed and analyzed. The results showed that few cracks on the steel wire surface could be eliminated by grinding, and the fatigue life of the specimens could be increased. Finally, the stress-life-mass loss rate (S-N-η) probability model based on the Weibull distribution was obtained using the measured fatigue data, which can be further referenced in the planning of the inspection of suspender service status, steel wire corrosion protection, and fatigue life prediction, etc.

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Suspender Replacement Method for Long‐Span Concrete‐Filled Steel Tubular Arch Bridges and Cable Force Measurement Based on Frequency Method

Cited by 6 publications

References 18 publications

Vehicle Load Spectrum and Fatigue Vehicle Model of a Long‐Span Concrete‐Filled Steel Tube (CFST) Arch Bridge Based on Measured Data of Weight‐In‐Motion System

Vehicle Load Spectrum and Fatigue Vehicle Model of a Long‐Span Concrete‐Filled Steel Tube (CFST) Arch Bridge Based on Measured Data of Weight‐In‐Motion System

Temporal and Spatial Variation Study on Corrosion of High-Strength Steel Wires in the Suspender of CFST Arch Bridge

Corrosion Fatigue Test and Performance Evaluation of High-Strength Steel Wires Based on the Suspender of a 11-Year-Old Concrete-Filled Steel Tube Arch Bridge

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