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（1 武漢理工大學(xué)道路橋梁與結(jié)構(gòu)工程湖北省重點(diǎn)實(shí)驗(yàn)室，  武漢 430070； 2 廣東省廣州市增城城鄉(xiāng)規(guī)劃局， 廣州 510000)

［摘要］斜拉索偏心覆冰后，氣動(dòng)外形不再穩(wěn)定，在風(fēng)荷載作用下，可能誘發(fā)馳振。主要對(duì)三維扇形覆冰斜拉索以及串列雙索尾流馳振進(jìn)行研究。首先應(yīng)用FLUENT中的SST k\|ω模型對(duì)三維扇形覆冰斜拉索及串列雙索的繞流場(chǎng)進(jìn)行數(shù)值模擬，得到全向角下的阻力系數(shù)、升力系數(shù)及馳振力系數(shù)，然后依此判定覆冰斜拉索是否發(fā)生馳振，并得到某大跨斜拉橋部分斜拉索的馳振臨界風(fēng)速。數(shù)值分析結(jié)果表明，經(jīng)過(guò)三維模擬計(jì)算的扇形覆冰直索及斜索的馳振力系數(shù)均大于零，表明在模擬的工況下，扇形覆冰單索在風(fēng)荷載作用下不會(huì)發(fā)生馳振；而串列雙索會(huì)在40°左右存在馳振力系數(shù)小于零的區(qū)域，會(huì)發(fā)生尾流馳振，但馳振臨界風(fēng)速很小。

［關(guān)鍵詞］扇形覆冰； 單索雙索； 氣動(dòng)力參數(shù)； 尾流馳振； 臨界風(fēng)速

中圖分類(lèi)號(hào)：U448-27文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)09-0120-07

Analysis of wind-induced vibration   and wake  galloping  for  3D fan-shaped single cable and  tandem double cables with iced accretion

Tan Dongmei1， Luo Suzhen1， Qu Weilian1， Wang Kaili2， Mao Shanming1

(1 Hubei Key Lab of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070，China；2 Urban and Rural Planning Bureau of Zengcheng，Guangzhou City, Guangdong Province, Guangzhou 510000，China)

Abstract:After eccentric iced accretion, the aerodynamic shape of the stay cable is no longer stable, which may induce galloping vibration under wind load. Wake galloping analyses of 3D fan-shaped single stay cable with iced accretion and  tandem double cables with iced accretion were conducted. Firstly, the SST k-ω model in FLUENT was used to simulate the flow field around the 3D fan-shaped single stay cable with iced accretion and  tandem double cables with iced accretion, to obtain the drag coefficient, lift coefficient and galloping force coefficient under the omnidirectional angle. Then, it was determined whether the fan-shaped stay cable with iced accretion occured galloping, and the critical wind speed of the partial cable stay of a large-span cable-stayed bridge was obtained. The results of numerical analysis show that the galloping force coefficient of the fan-shaped stay cable and straight cable with iced accretion calculated by 3D simulation are greater than zero. This indicates that under the simulated working condition, the fan-shaped single cable with iced accretion would not gallop under the wind load. However, the tandem double cables would have a region where the galloping force coefficient is less than zero at around 40°, and wake galloping would occur, but the critical wind speed of the galloping is small.

Keywords:fan-shaped iced accretion; single cable and double cables; aerodynamic parameter; wake galloping; critical wind speed

*國(guó)家自然科學(xué)基金資助項(xiàng)目（51408452），湖北省重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金資助項(xiàng)目（DQJJ201509）。

作者簡(jiǎn)介：譚冬梅，博士，副教授，Email:smiledongmei@163.com。