基于CFD的大跨度悬索桥主塔抗风性能分析  

Analysis on Wind-resistant Performance of Main Tower for Large-span Suspension Bridge Based on CFD

作　　者：安伟胜[1] AN Wei-sheng(Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050011,China)

机构地区：[1]河北省交通规划设计院,石家庄市050011

出　　处：《北方交通》2018年第7期30-33,共4页Northern Communications

摘　　要：大跨度悬索桥在跨越大江、大河、深沟、峡谷时越来越受到青睐,而随着桥梁跨度增大、索塔的增高,大跨度悬索桥越发轻柔,对风致振动也越加敏感。在施工过程中,较高、较柔索塔在独塔状态下的抗风性能相对较差,应予以高度重视。对某主跨828m的铁路悬索桥主塔,运用流体动力学(CFD)方法模拟分析了主塔断面在风作用下的涡振性能。结果表明,索塔断面背风侧有明显的漩涡脱落,较钝的索塔断面易受风致涡振影响;独塔状态下索塔的涡振风速为15~18m/s,风速相对较低,发生概率较高;建议采用较为圆滑的断面并在独塔施工中做好横向连接,同时尽量避免在多风季节施工。The large-span suspension bridge is more and more popular when crossing the river,deep groove,and canyon. With the increase of bridge span and height increase of cable bent tower,the large-span suspension bridge is more pliable and more sensitive to the wind-induced vibration. During the construction,the wind-resistant performance of higher and more pliable cable bent tower is very poor,which should be paid high attention to. As for the main tower of railroad suspension bridge with a main span of 828 m,the analysis on the vortex vibration performance of main tower section under the effect of the wind is made by utilizing the method of computational fluid dynamics（ CFD）. The results show that,the leeward side of the section of the cable bent tower has obvious vortex shedding,and the dull section is easily influenced by the wind-induced vortex vibration; the wind speed of vortex vibration of the cable bent tower under the state of single tower is 15 m/s ~ 18 m/s,the wind speed is relatively low,and the probability of occurrence is higher; it is suggested to adopt a pliable section and provide cross connection during the construction of single tower,and meanwhile avoid the construction in windy season as possible.

关 键 词：大跨度悬索桥 主塔 CFD 抗风性能 风致振动 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]