Distributed stiffness assessment of bridges based on macro-strain envelope curve under moving trainloads

Wu, Bitao; OuYang, Yao; Chen, Hua-peng; Zhou, Zhenwei; Guo, Zhongzhao; Ren, Liang

doi:10.1016/j.istruc.2024.106142

Cited by 2 publications

References 31 publications

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Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

Jia,

Xie,

Zhou

et al. 2024

Preprint

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To investigate the dynamic characteristics of simply-supported beam bridges in high-speed railways under long-term deterioration, the deterioration law of concrete strength, considering the combined effects of carbonation and freeze-thaw cycles, is analyzed based on time-varying concrete strength theory. The accuracy of the finite element model is validated by measuring and comparing the vibration signals of a two-lane simply-supported beam bridge on the Beijing-Shenyang high-speed railway. Subsequently, the frequency variability of mid-span box girder vibration signals and vibration energy is analyzed using local maximum synchrosqueezing transform, and the multifractal characteristics of the box girder vibration signals are further examined. The results indicate that vertical acceleration of the box girder and the top of the pier increased by 31.2% and 67.6%, respectively, as deterioration intensified. Additionally, the vibration frequency of the box girder decreased from 28 Hz to 25 Hz, suggesting a marked decline in structural stiffness. Simultaneously, the energy of the self-oscillating frequency near 8 Hz dispersed progressively over time. The width (Δα) of the multifractal spectrum increases gradually, reflecting more pronounced multifractal characteristics, while the waveform of the box girder vibration signals shifts from small to large wave peaks. These findings provide valuable insights for performance evaluation, safety monitoring, and maintenance of simply-supported beam bridges.

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Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

Jia,

Xie,

Zhou

et al. 2024

Preprint

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Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

Bondar,

Aldekeyeva,

Ospanova

2024

Vib. proced.

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The paper presents the results of computational analysis of the stress-strain state of reinforced concrete spans of the railway (single-track railway line) overpass over the highway, under specified loads using spatial finite element models. The static load consists of a cohesion of three TEM-18 diesel locomotives and two loaded gondola cars (up to 25 tons per axle). The purpose of this study was to ensure reliable and safe operation of artificial structures on the railroads, as there is a constant increase in transit freight trains from China through the territory of Kazakhstan to near and far abroad, and often the load on the axle reaches 25 tons, and sometimes larger values – up to 27 tons per axle. The results of the study are recommended to be used for inspections and tests of typical girder bridge spans, as well as in the case of monitoring their technical condition with increasing operational loads.

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Distributed stiffness assessment of bridges based on macro-strain envelope curve under moving trainloads

Cited by 2 publications

References 31 publications

Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

Structural Dynamic Response of Simply Supported Beam Bridge of High-Speed Railway Based on Time-Dependency Deterioration of Concrete

Stress-strain states of reinforced concrete spans of a railroad overpass using a spatial finite element model

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