Strengthening Prestressed Concrete Box Girder Bridge by Upgrading Structural System

Song, Yifan; Hu, Wenliang; Yuan, Yangguang; Ren, Shipu

doi:10.1061/(asce)cf.1943-5509.0001377

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…The defects in the design and construction of existing bridges in China and the damage, aging, or disasters in the long-term use process are gradually exposed, and many problems such as cracking of concrete structures, reduced service performance, insufficient bearing capacity, and poor seismic performance have seriously affected the service life and structural safety of existing road network structures [ 3 ], and with the emergence of overweight equipment transportation, due to the limitation of the design load level of some bridges, especially those built in the early days, the load level cannot meet the needs of overweight equipment transportation. Due to the lack of necessary monitoring and corresponding maintenance, a large number of bridge damage accidents have occurred around the world, causing huge losses to the national economy, life, and property [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Yan

2022

International Journal of Analytical Chemistry

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In order to solve the problem of vehicle-bridge coupling vibration of a continuous semisteel bridge, the main bridge type of long-span prestressed concrete girder bridge, the author proposes a bridge safety test system based on the dynamic and static load test. The system combines the change of stress and deflection with the vibration amplitude of the bridge body, and using the modeling assistant in large-scale finite element software MIDAS/CIVIL, a three-dimensional finite element real bridge model is established, including input of section data, the input of boundary conditions, and the input of loads. The result obtained is as follows: the structural verification coefficient of the control strain of the main girder under each working condition is not greater than 1.0, indicating that the flexural rigidity of the structure meets the design requirements. In addition, under each working condition, the ratio of the residual strain after unloading to the measured total strain is less than 20%. Under each working condition, the deflection calibration coefficient of each control section is less than 1.0, and the ratio of residual deflection to total deflection of each measuring point is at most 3.9%; each residual deflection is small. The damping ratios are all less than 5% of the empirical damping ratio of concrete members, indicating that the bridge structure is in good condition. The result obtained by the author is compared with the standard allowable value and the theoretical calculation value, so as to provide a basis for the study of the bearing capacity of similar bridges and to verify the standardization and rationality of the existing bridge structural design.

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Section: Introductionmentioning

confidence: 99%

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Yan

2022

International Journal of Analytical Chemistry

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Behavior of confined concrete columns with HSSSWR meshes reinforced ECC jacket under uniaxial compression

Wei

Wang

et al. 2022

Construction and Building Materials

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Decision Analysis of a Reinforcement Scheme for In-Service Prestressed Concrete Box Girder Bridges Based on AHP and Evaluation of the Reinforcement Effect

Liu

Zhang

et al. 2022

Buildings

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Prestressed concrete girder bridges are widely used worldwide due to their mature construction technology, economical cost, and low maintenance. After a certain number of years of service, prestressed concrete girders inevitably suffer from deterioration of their material properties, cracking, and reduced load-carrying capacity due to the natural environment and long-term vehicle loading. When the performance of a bridge declines to the point that it cannot meet the requirements of normal use, reinforcement and maintenance are required. In this study, a 5 × 45 m prestressed concrete continuous box girder bridge that has been in service for 25 years is taken as an example, and the causes of crack development and deterioration of the technical condition of the bridge are analyzed. Based on an analysis of the causes, reinforcement schemes for overall replacement of the girder and adding bridge piers are proposed. According to a comparison of the advantages and disadvantages, a decision analysis of the reinforcement scheme is carried out via the analytic hierarchy process (AHP). The vector weights of the two schemes were found to be 0.4288 and 0.5712, respectively, indicating that adding bridge piers is more advantageous than overall replacement of the girder. Thus, a scheme of adding five piers was adopted to reinforce the bridge. A load test was then performed after the reinforcement, and both the test deflection and strain calibration coefficients were found to be less than 1, indicating that the force state of the added piers and bearings was better than the theoretical calculations. The present study shows that the reinforcement scheme of adding piers can achieve the design goal. The working status of the box girder was significantly improved, the crack development of box girder was suppressed, and the service life of the bridge was prolonged.

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Strengthening Prestressed Concrete Box Girder Bridge by Upgrading Structural System

Cited by 4 publications

References 15 publications

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Load Test Analysis of a Long-Span Prestressed Nano-Concrete Highway Bridge

Behavior of confined concrete columns with HSSSWR meshes reinforced ECC jacket under uniaxial compression

Decision Analysis of a Reinforcement Scheme for In-Service Prestressed Concrete Box Girder Bridges Based on AHP and Evaluation of the Reinforcement Effect

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