Aerodynamic optimization for flutter performance of steel truss stiffening girder at large angles of attack

Tang, Haojun; Li, Yongle; Wang, Yunfei; Tao, Qiyu

doi:10.1016/j.jweia.2017.06.013

Cited by 39 publications

(25 citation statements)

References 11 publications

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“…Mature construction methods include the deck crane construction method [16], and the cable crane construction method, among others [8,9]. Rail cable shifting (RCS) is a new, recently invented method, and it was firstly used in the successful erection of the girder of the Aizhai Bridge [17][18][19][20][21][22][23]. The erection of the 1000.5-m steel truss girder required only two and a half months [16].…”

Section: Introductionmentioning

confidence: 99%

Form-Finding Analysis of the Rail Cable Shifting System of Long-Span Suspension Bridges

Pan

Yan

2018

Applied Sciences

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The determination of the non-loading condition of the rail cable shifting (RCS) system, which consists of the main cables, hangers, and rail cables, is the premise of girder erection for long-span suspension bridges. An analytical form-finding analysis model of the shifting system is established according to the basic assumptions of flexible cable structures. Herein, the rail cable is discretized into segmental linear cable elements and the main cable is discretized into segmental catenary elements. Moreover, the calculation and analysis equations of each member and their iterative solutions are derived by taking the elastic elongation of the sling into account. In addition, by taking the girder construction of the Aizhai suspension bridge as the engineering background, a global scale model of the RCS system is designed and manufactured. The test system and working conditions are also established. The comparison between the test results and analytical results shows the presented analytical method is correct and effective. The process is simplified in the analytical method, and the computational results and precision satisfy practical engineering requirements. In addition, the proposed method is suitable for application in the computation analysis of similar structures.

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Section: Introductionmentioning

confidence: 99%

Form-Finding Analysis of the Rail Cable Shifting System of Long-Span Suspension Bridges

Pan

Yan

2018

Applied Sciences

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“…1 The research on wind-induced vibrations of bridges is becoming more important with the continuous emergence of bridges with new record-span lengths. [2][3][4][5] For example, flutter determines structural safety under high-speed winds; vortex-induced oscillations greatly influence bridge performance in low-speed winds; and buffeting can influence bridge fatigue even under normal wind conditions. Therefore, wind resistance safety assessment is critical for both the design and operation of largespan bridges.…”

Section: Introductionmentioning

confidence: 99%

Wind characteristics at a long-span sea-crossing bridge site based on monitoring data

Zhou

Sun

Xie

2018

Journal of Low Frequency Noise, Vibration and Active Control

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Six years of wind data are used to investigate the statistical characteristics of general and strong winds acting on the Donghai Bridge, a sea-crossing bridge in China. The general wind at the bridge site shows a relatively stable annual repeatability, and the discrepancies are found between the measured wind field parameters and those suggested by the design code. For strong winds, both the 10-min mean wind speed and the turbulent variance greatly exceed those of general winds, while the turbulence intensity, integral length scale, and gust factor do not exhibit any noticeable quantitative trends. The measured wind spectra of both general and strong winds show a shift toward the high-frequency range compared with Simiu’s spectrum (along-wind direction). The wind measurements at the bridge site are easily interfered with the bridge structure itself, resulting in a greater turbulence along the bridge axis and a higher turbulent kinetic energy in the high-frequency range, which needs to be considered in designing structural health monitoring systems in the future. This study provides field evidence for the wind-resistant design and evaluation of long-span sea-crossing bridges.

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“…Investigations on flutter performances of long-span bridges and effectiveness of various aerodynamic control measures are often focus on the special case of the wind direction normal to a bridge span, that is, the normal wind (Agar, 1989; Ding et al, 2002; Ge and Tanaka, 2000; Jain et al, 1996; Katsuchi et al, 1999; Namini et al, 1992; Scanlan, 1978; Scanlan & Gade, 1977; Tang et al, 2017), because the normal wind is conventionally regarded to be most dangerous to bridges. However, it was already found that this kind of cognition about the dangerous wind direction is not always true.…”

Section: Introductionmentioning

confidence: 99%

“…For instances, it was adopted in the 960 m Yichang Yangtze suspension bridge, the 900 m Xiling Yangtze suspension bridge, the 900 m Siduhe suspension bridge, the 1088 m Balinghe suspension bridge, the 1146 m Aizhai suspension bridge, the 636 m Beipanjiang suspension Bridge, the 762 m Beipanjiang cable-stayed bridge, and the 504 m Tianxingzhou Yangtze cable-stayed bridge for a high-speed railway. However, compared with the long-span bridge with stream-line steel box decks, the long-span bridges with truss-stiffened decks have relatively lower critical flutter wind speeds (Liu et al, 2017; Tang et al, 2017; Wang et al, 2016; Zhu et al, 2013). Therefore, the unfavorable effect of yaw wind on flutter performance of long-span bridges with truss-stiffened decks should be paid more attention to.…”

Section: Introductionmentioning

confidence: 99%

Effects of central stabilizing barriers on flutter performances of a suspension bridge with a truss-stiffened deck under skew winds

Zhu

Tan²,

Guo

et al. 2018

Advances in Structural Engineering

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To improve the flutter performance of a suspension bridge with a 1088-m-span truss-stiffened deck, the aerodynamic measures of upper and lower central stabilizing barriers were investigated at first via wind tunnel tests of sectional model under the normal wind condition. The yaw wind effect on the flutter performance of the bridge with the above aerodynamic measures was then examined via a series of wind tunnel tests of oblique sectional models. The test results show that the effect of the lower central stabilizing barrier on the flutter critical wind speed is remarkably different from that of the upper central stabilizing barrier for both the normal and skew wind cases. The inclination angle +3° is the most unfavorable inclination angle to the flutter performance of the truss-stiffened suspension bridge no matter whether the aerodynamic control measures are adopted or not. Furthermore, for most cases, the lowest flutter critical wind speed occurs when the incident wind deviates from the normal direction of the bridge span by a small yaw angle between 5° and 10°.

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Aerodynamic optimization for flutter performance of steel truss stiffening girder at large angles of attack

Cited by 39 publications

References 11 publications

Form-Finding Analysis of the Rail Cable Shifting System of Long-Span Suspension Bridges

Form-Finding Analysis of the Rail Cable Shifting System of Long-Span Suspension Bridges

Wind characteristics at a long-span sea-crossing bridge site based on monitoring data

Effects of central stabilizing barriers on flutter performances of a suspension bridge with a truss-stiffened deck under skew winds

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