Experimental investigation on vortex-induced vibration of a long-span rail-cum-road bridge with twin separated parallel decks

Liu, Lulu; Zou, Yunfeng; He, Xuhui; Yang, Jiafeng; Wang, Zhen; Guo, Dianyi

doi:10.1016/j.jweia.2022.105086

Cited by 16 publications

(5 citation statements)

References 48 publications

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“…The dimensionless wind pressure coefficient are defined as (Hu et al, 2019; Liu et al, 2021):where C Pi (t) is the wind pressure coefficient time history of the pressure measuring point i on the surface of the highway and railway girder; P i (t) is the pressure time history measured at point i on the surface of the highway and railway girder; C P, mean is the mean wind pressure coefficient; C P, rms is the fluctuating wind pressure coefficient; P 0 is the static pressure in the wind tunnel, which is measured by the side hole of the pitot tube used to monitor the oncoming flow; and V is the mean wind speed. The distribution of wind pressure coefficient on the surface of the girder represents the overall distribution characteristics of flow on the surface, and it can represent the separation and reattachment of air flow on the surface of the girder (Hu et al, 2019; Liu et al, 2021, 2023).…”

Section: Wind Tunnel Testmentioning

confidence: 99%

“…The bottom surfaces of the two decks that make up the double-width main beam are flush with each other. More detailed description about the long-span railcum-road bridge with twin-separated parallel decks can be seen in related papers (Liu et al, 2022(Liu et al, , 2023. Wind barriers will be installed on both sides of the railway girder instead of the handrail.…”

Section: Engineering Backgroundmentioning

confidence: 99%

“…While, Cl, Cd and Cm are the lift, drag, and lifting moment coefficients of the railway bridge per unit length. Fl, Fd and Fm are the lift, drag and moment of the railway bridge, respectively; ρ is the air density, ρ = 1.225 kg/ m 3 ; and V is the mean wind speed (Liu et al, 2022).…”

Section: Data Processingmentioning

confidence: 99%

“…Relevant parallel bridges, the Jindo bridges in Korea, the Fred Hartman the J.P. Duarte bridges in St. Domingo, the Hongdao bridges in China, that have been built are twin parallel highway bridges. Long-span rail-cum-road bridges with twin-separated parallel decks are becoming increasingly popular bridge types in China due to their higher highway and railway traffic capacity and the economic benefits gained by avoiding the construction of two separate bridges (Liu et al, 2022). However, due to the aerodynamic interference between the railway and highway bridges, the research on wind resistance characteristics is usually more challenging (Argentini et al, 2015; Matsumoto et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Liu,

Yang,

Zou

et al. 2023

Advances in Structural Engineering

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The aerodynamic characteristics of twin-separated parallel decks for long-span rail-cum-road bridges with various wind barriers clamped at railway girder are more complicated because of aerodynamic interference. Experimental investigations on aerodynamic coefficient and wind pressure coefficients of twin girders under different incoming flow directions were conducted using wind tunnel tests. Three different heights ( H) varying from 2 m to 4 m and four different ventilation ratios ( R) varying from 20% to 50% for wind barriers were examined. Results indicated that the aerodynamic coefficients were affected significantly by the incoming wind direction, which must be considered, and the railway wind barrier affected the aerodynamic characteristics of the railway girder when it is located both upstream and downstream, but the laws are not the same. Due to the aerodynamic interference effect of the twin parallel girders, the aerodynamic characteristics of the adjacent highway girders were also affected by the wind barrier along the railway girder, especially when the highway girders were located downstream. While, the highway girders were less affected when located upstream. The influence of wind barrier height and ventilation ratios on the adjacent highway girders was completely different. Most importantly, the parameters optimization of wind barriers clamped at railway girders should be determined after a comprehensive evaluation of the aerodynamic characteristic of both the railway and highway girders.

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Section: Wind Tunnel Testmentioning

confidence: 99%

Section: Engineering Backgroundmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Liu,

Yang,

Zou

et al. 2023

Advances in Structural Engineering

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“…When the airflow passes through a streamlined box girder section with a small wind faring angle, it cannot easily form vortices with low frequency and high energy. Based on the VIV performance of a streamlined box girder, the flow structure and corresponding mechanism have some engineering application value (Duan,2022; Liu 2022).…”

Section: Introductionmentioning

confidence: 99%

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Duan

2023

Advances in Structural Engineering

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To investigate the vortex-induced vibration (VIV) characteristics of a narrow-streamlined railway box girder and optimize its VIV performance, a long-span railway cable-stayed bridge was analyzed. Based on sectional model wind tunnel tests, the influence of the wind attack angle and the damping ratio on the VIV performance of the girder was investigated. The main inducing factors of the VIV of the narrow railway box girder were explored and a series of corresponding optimization schemes was put forward. The results show that there is no VIV when the wind attack angles are −5°, −3° and 0°, and the damping ratio is 0.2%. The non-dimensional maximum amplitudes 1000 y/ D of the girder at wind attack angles of +3° and +5° are 14.4 and 19.4, respectively. The maximum amplitudes decrease with the increase of the damping ratios. The railing base is the influence factor that induces the vertical VIV, because the separation vortices between the railing base and ballast wall, as well as behind the railings, cause the VIV of the railway steel box girder. Compared with that of the girder section with the ballastless track board, the non-dimensional maximum vertical VIV amplitude of the girder without the ballastless track board greatly increases from 19.4 to 63.5, which could effectively suppress the VIV of the main girder. Lastly, in the construction state, vertical VIV occurs for girder sections I and II, which have respective aspect ratios of 4.3 and 4.6, at wind attack angles of +3° and +5°. Girder section III, which has a 6.7 aspect ratio and is more streamlined, does not have a VIV. The greater the aspect ratio of the bridge girder, the better the VIV performance. The relevant results could serve as a guide for wind resistance design of railway streamlined box girders.

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Spatio-temporal distribution of aerodynamic forces and their associated vortex drift patterns around a closed-box girder during torsional vortex-induced vibration

Hu,

Zhao,

Wang

et al. 2024

Engineering Structures

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Experimental investigation on vortex-induced vibration of a long-span rail-cum-road bridge with twin separated parallel decks

Cited by 16 publications

References 48 publications

Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Effects of wind barriers on the aerodynamic characteristics of twin-separated parallel decks for a long-span rail-cum-road bridge

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Spatio-temporal distribution of aerodynamic forces and their associated vortex drift patterns around a closed-box girder during torsional vortex-induced vibration

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