| 苏通长江公路大桥设计风速的计算与分析 |
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| 引用本文： | 刘聪,黄世成,朱安祥,江志红.苏通长江公路大桥设计风速的计算与分析[J].应用气象学报,2006,17(1):44-51. |
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| 作者姓名： | 刘聪 黄世成 朱安祥 江志红 |
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| 作者单位： | 1.南京信息工程大学大气科学系, 南京 210044 |
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| 基金项目： | 香港特别政府资助局基金(CUHK/4180/01E,CUHK/1/00C)，交通部“苏通长江公路大桥”建设项目共同资助。 |
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| 摘 要： | 苏通长江大桥是世界第一跨度斜拉桥, 设计风速对其设计、建设、运营安全至关重要。为了合理选用大桥的设计风速, 在大桥桥位长江江面、江岸、南通气象站、常熟气象站建立风速同步观测站, 在桥位南岸建立80 m高的风梯度观测塔, 2000年3月1日至2003年2月28日开展地面及梯度风同步观测, 获取大桥设计风速计算所需的基础资料。在分析桥位风况与当地气象站异同及桥位风速随高度变化规律的基础上, 将气象站长年风速数据客观外延至桥位, 采用极值频率分布拟合方法, 分析计算得到大桥建设所需的设计基本风速和基准风速。分析表明:江面风速明显大于气象站, 也大于江岸风速, 计算值大于理论推算值。结果为大桥抗风设计提供了依据。
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| 关 键 词： | 公路大桥 同步观测 设计风速 计算 |
| 收稿时间： | 2005-06-14 |
| 修稿时间： | 2005-07-28 |
Analysis and Computation on Design Wind Velocity of Sutong Changjiang Highway Bridge |
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| Liu Cong,Huang Shicheng,Zhu Anxiang,Jiang Zhihong.Analysis and Computation on Design Wind Velocity of Sutong Changjiang Highway Bridge[J].Quarterly Journal of Applied Meteorology,2006,17(1):44-51. |
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| Authors: | Liu Cong Huang Shicheng Zhu Anxiang Jiang Zhihong |
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| Affiliation: | 1.Department of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 2100442.Jiangsu Provincial Institute of Meteorological Science, Nanjing 2100083.Constructed Headquarters of Sutong Bridge, Nantong 226009 |
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| Abstract: | utong Changjiang Highway Bridge is the longest cables stayed bridge in the world at present.The correct design wind velocity is highly important to design,construction and operation of the bridge.In order to obtain the reasonable design wind velocity of the bridge,four wind observations are established both on the bank and on the bridge reach of the Changjiang River and both in Nantong and Changshu meteorological observation stations.Further more,a wind observation tower of 80 m in height is also set up on the bank at the same place to measure gradient wind,that is the wind on 10 m,30 m,50 m,70 m,80 m in height respectively.Wind simultaneous observations in four stations above mentioned and on wind observation tower are then in process from 1st March 2000 to 28th February 2003 to collect the basic data which are necessary for calculating the design wind velocity of the bridge.On the basis of contrasting the corresponding wind data from the four wind observing stations,long series history wind data from nearby meteorological observation station are extended into the bridge reach on the river.By using the gradient data,the variation law of wind velocity with height is studied.As a result,the fitting method of frequency distribution of extreme value is used here to calculate and estimate the reasonable basic designing and engineering wind velocity,which are requisite to the bridge construction.Finally,five conclusions are found as follows.(1) Because of the influences caused by the different geographic environments,the wind velocity of the bridge reach is obviously stronger than that of the nearby meteorological stations,especially the velocities of easterly and northwesterly wind.Generally speaking,the wind velocity of the bridge reach on Changjiang River is about twice as strong as that of the nearby meteorological stations on continent.(2) The wind velocity of the bridge reach on the river surface is also evidently stronger than that on the bank of the river,so that in practical application the wind velocity on the bank can not be substituted for that on the river surface.(3) There is a fine linear correlation relationship between the velocities of the bridge reach and of the nearby meteorological observation stations.When calculating the velocities of the bridge reach,results obtained by using the data of two nearby stations,i.e.,Nantong and Changshu observatories,are better than those gained by using the data of one nearby station only.After that,according to insurance probability the confidence interval of design wind velocity is determined.(4) Variation of the wind velocities of the bridge reach with height is in keeping with the exponential law.Here the exponent value is equal to 0.118 which is less than recommended by standards.(5) The wind velocity samples of equal and more than 6 m/s are chosen to compute the basic design wind velocity of Sutong Changjiang Highway Bridge.Though the result of 38.9 m/s is slightly stronger than that simply calculated in the light of standards,the bridge can resist the wind disaster which has return period of 100 years.Therefore,the reliable scientific basis of resistance against wind disaster is provided to making designs for Sutong Changjiang Highway Bridge by the research results of this paper.What is more,the new method of calculating the wind velocity on the river surface developed in the paper may be popularized to other water surface. |
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| Keywords: | highway bridge simultaneous observation engineering wind velocity computation |
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