Experimental Investigation on Quasi-Steady and Unsteady Self-Excited Aerodynamic Forces on Cable and Rivulet

Li, Shouying; Chen, Zhengqing; Sun, Weiqi; Li, Shouke

doi:10.1061/(asce)em.1943-7889.0000961

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Due to the obvious challenges associated with full-scale field measurements, many authors have studied RWIVs using wind tunnel tests. There are generally two methods adopted to simulate rain conditions-the guiding water method [91,92] and the spraying water method [85,93,94]. The former creates the water rivulet by installing a guiding tube on one end of the cable, while the latter simulates raining by spraying water from nozzles.…”

Section: Wind Tunnel Studies Of Rain-wind-induced Vibrationmentioning

confidence: 99%

“…The former creates the water rivulet by installing a guiding tube on one end of the cable, while the latter simulates raining by spraying water from nozzles. Li et al [91] investigated the aerodynamic forces involved in RWIVs by conducting wind tunnel tests on a cable model with a diameter of 350 mm and a length of 1.54 m. Experiments were performed in a closed-circuit wind tunnel, in which the cable model was suspended by a forced vibration system. Two types of surface configurations were considered-a smooth surface and a surface with an artificial upper rivulet attached.…”

Section: Wind Tunnel Studies Of Rain-wind-induced Vibrationmentioning

confidence: 99%

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Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

2021

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Engineers, architects, planners and designers must carefully consider the effects of wind in their work. Due to their slender and flexible nature, long-span bridges can often experience vibrations due to the wind, and so the careful analysis of wind effects is paramount. Traditionally, wind tunnel tests have been the preferred method of conducting bridge wind analysis. In recent times, owing to improved computational power, computational fluid dynamics simulations are coming to the fore as viable means of analysing wind effects on bridges. The focus of this paper is on long-span cable-supported bridges. Wind issues in long-span cable-supported bridges can include flutter, vortex-induced vibrations and rain–wind-induced vibrations. This paper presents a state-of-the-art review of research on the use of wind tunnel tests and computational fluid dynamics modelling of these wind issues on long-span bridges.

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Section: Wind Tunnel Studies Of Rain-wind-induced Vibrationmentioning

confidence: 99%

Section: Wind Tunnel Studies Of Rain-wind-induced Vibrationmentioning

confidence: 99%

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

2021

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“…RWIV was first observed on the Meiko Nishi Bridge in Japan in the early 1980s (Hikami and Shiraishi, 1988). Since then on, many investigators have made great efforts to clarify the underlying mechanism of RWIVs of stay cables by means of field observations (Chen et al, 2004; Hikami and Shiraishi, 1988; Matsumoto et al, 2003; Phelan et al, 2006), wind tunnel tests (Bosdogianni and Olivari, 1996; Du et al, 2013; Flamand, 1995; Gu and Du, 2005; Hikami and Shiraishi, 1988; Li et al, 2010, 2016; Yamaguchi, 1990), theoretical analyses (Cao et al, 2003; Cosentino et al, 2003; Gu et al, 2009; Gu and Lu, 2001; Li et al, 2013, 2014; Peil and Nahrath, 2003; Van Der Burgh and Hartono, 2004; Wilde and Witkowski, 2003; Wu et al, 2013; Xu and Wang, 2003; Yamaguchi, 1990), and computational fluid dynamics (CFD) simulations (Li and Gu, 2006; Robertson et al, 2010). The exact features of RWIV could be obtained from field observations, and elaborated parametric studies could be conducted by using wind tunnel tests to evaluate the most sensitive factors for RWIV.…”

Section: Introductionmentioning

confidence: 99%

Coupled responses of stay cables under the combined rain–wind and support excitations by theoretical analyses

Wang

Qingyu

et al. 2020

Advances in Structural Engineering

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Stay cables on several cable-stayed bridges all over the world have been found to experience rain-wind-induced vibrations under the combined action of rain and wind. Meanwhile, the bridge deck might also have obvious oscillation under the wind and/or traffic loads. The coupled responses of a stay cable under the combined rain–wind and support excitations are numerically investigated in this article. The equations of motion of a three-dimensional continuous stay cable are derived by considering the high-order nonlinear components of the dynamic cable tension, together with the equation of motion of the rivulet on the cable surface. The forces induced by rain–wind excitation are determined by the quasi-steady theory, and the support excitation is achieved by the boundary condition. The coupled equations of the cable and the rivulet are numerically solved by using the finite difference method and the fourth-order Runge–Kutta method, respectively. The numerical results show that the high-order nonlinear components of the dynamic cable tension should be taken into account to numerically reproduce the parametric vibration of the stay cable, whereas they hardly have any effects on the rain-wind-induced vibration and the resonance vibration of the stay cable. The responses of stay cable under vertical support oscillation only and the rain–wind excitation only obtained from this study agree well with the literature results. Compared with the results induced by single-source excitation, the cable response amplitude under the combined excitations is smaller than that induced only by support excitation and larger than that induced only by rain–wind excitation. The rivulet is prone to be thrown from the cable surface if the parametric vibration of the stay cable is evoked.

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“…The mechanism of rain-and wind-induced vibration of stay cable needs further investigations before fully understanding it (Gu et al, 2009;Li et al, 2013Li et al, , 2014aLi et al, , 2016aYamaguchi, 1990). At the same time, the effective countermeasures should be proposed to mitigate the vibrations of stay cables and ensure the safety of cable-stayed bridges.…”

Section: Introductionmentioning

confidence: 99%

On the aerodynamic characteristics of stay cables attached with helical wires

Deng

Zhong

et al. 2017

Advances in Structural Engineering

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To investigate the aerodynamic characteristics of stay cables attached with helical wires, a series of wind tunnel tests and computational fluid dynamics simulations were both carried out on the smooth and helical-wire cable models. The diameters of helical wires include 2, 3, and 4 mm, and the distances between adjacent helical wires include 200, 300, and 600 mm. Pressure taps were uniformly arranged on seven cross sections of the cable models. First, wind tunnel tests including 50 test cases were conducted to measure the wind forces and wind pressures on the cables using the forced vibration system in HD-2 wind tunnel. The effects of the helical wires on the mean and fluctuating aerodynamic forces and the correlation coefficients along the cable axis were investigated in detail based on the experimental data. Second, large Eddy simulation module incorporated in software FLUENT Ò was used to simulate the aerodynamic forces on the smooth and helical-wire cables. The parameters of the cable and the helical wire are similar to those used in the wind tunnel tests. The results show that helical wires can attenuate vortex shedding and reduce the wind pressure correlation along the cable axis. Within the Reynolds number range from 0.4 3 10 5 to 1.6 3 10 5 , the mean drag force of the helical-wire cable is lower than the value of the smooth cable, and the correlation coefficient decreases with the increase in wind velocity. The results obtained from wind tunnel tests and computational fluid dynamics simulations agree well with each other. Furthermore, the wind velocity contour around the helical-wire cables obtained from computational fluid dynamics simulations visually indicates that the approaching flow is forced to separate at the surface of the helical wire in advance, which makes the vortex shedding disorder along the cable axis.

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Experimental Investigation on Quasi-Steady and Unsteady Self-Excited Aerodynamic Forces on Cable and Rivulet

Cited by 8 publications

References 19 publications

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

Coupled responses of stay cables under the combined rain–wind and support excitations by theoretical analyses

On the aerodynamic characteristics of stay cables attached with helical wires

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