Determination of dynamic amplification factors for small- and medium-span highway bridges considering the effect of automated truck platooning loads

Ling, Tianyang; Deng, Lu; He, Wei; Cao, Ran; Zhong, Wenjie

doi:10.1016/j.ymssp.2023.110812

Cited by 1 publication

(2 citation statements)

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“…To summarize, the dominant vibration modes of the deflection and bending moment for the mid-span section of a continuous girder bridge are of the first three orders. Currently, many national code provisions utilize the fundamental frequency to calculate DAFs [44][45][46]. However, when determining the deflection DAF or bending moment DAF…”

Section: Cut-off Modes For the Deflection And Bending Momentmentioning

confidence: 99%

“…However, when determining the deflection DAF or bending moment DAF for continuous girder bridges, it is crucial to consider the impact of modal contributions To summarize, the dominant vibration modes of the deflection and bending moment for the mid-span section of a continuous girder bridge are of the first three orders. Currently, many national code provisions utilize the fundamental frequency to calculate DAFs [44][45][46]. However, when determining the deflection DAF or bending moment DAF for continuous girder bridges, it is crucial to consider the impact of modal contributions from the second and third orders, in addition to the fundamental frequency.…”

Section: Cut-off Modes For the Deflection And Bending Momentmentioning

confidence: 99%

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Comparison of Dynamic Amplification Factor of Deflection and Bending Moment of Highway Continuous Box-Girder Bridges by Mode Superposition

Wang,

Zhou,

Zhao

et al. 2024

Materials

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There are differences between the dynamic deflection and bending moment (strain) in the same section of continuous girder bridges. However, the selection of the response for calculating dynamic amplification factors (DAFs), which are essential for bridge health monitoring and safety assessment, remains controversial. Modes may play a role in the relationship between the deflection DAF and the bending moment DAF in both numerical analysis and field tests. To investigate the distinctions between the DAFs of the deflection and bending moment in a continuous girder bridge, functional expressions of the DAFs were derived, taking into account multi-factor coupling under concentrated forces. The interaction effects of the mode and road surface condition (RSC), vehicle speed, bridge span length, and span number on the deflection DAF, the bending moment DAF, and the ratio of the deflection DAF to the bending moment DAF (RDM) of precast continuous box-girder bridges were analyzed using vehicle-bridge interaction. To ensure the accuracy of the DAF in numerical computations and experimental tests, two types of accuracy indexes and the corresponding cut-off modes were provided. Validation was conducted by performing dynamic load tests on two field bridges. The results indicate that different modes have a significant effect on the RDM of the mid-span section of a bridge. When considering multiple factors, the deflection DAF and bending moment DAF of the mid-span section increased rapidly with the considered modes and then stabilized. Statistically, the RDM of all nine bridges ranged from 1.00 to 1.12, indicating that the deflection DAF was greater than the bending moment DAF. The suggested cut-off modes can be utilized for efficient and accurate calculation of the DAF and response signal fidelity.

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Section: Cut-off Modes For the Deflection And Bending Momentmentioning

confidence: 99%

Section: Cut-off Modes For the Deflection And Bending Momentmentioning

confidence: 99%