基于模型试验的悬索桥主缆空气流动阻力计算  

Calculation of Air Flowing Resistance in Main Cable of Suspension Bridge Based on Model Tests

作　　者：陈策[1,2] 吉林[2] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]江苏省长江公路大桥建设指挥部,江苏泰州225321

出　　处：《桥梁建设》2010年第6期40-43,共4页Bridge Construction

基　　金：2008年度交通行业联合科技攻关项目(2008-353-332-170);"十一五"国家科技支撑计划(2009BAG15B02)

摘　　要：为研究干燥空气在悬索桥主缆中流动所产生阻力的计算方法,选取2根长度为6 m、直径分别为泰州长江公路大桥主缆1/2和1/4的主缆模型进行空气流动阻力试验。利用Origin软件将各种流速下空气流经主缆模型的压强拟合成直线,所得直线的斜率即为空气的单位沿程阻力。基于试验数据计算各种流速下空气在模型进气口、索夹、出气口处的局部阻力。采用回归法建立各种阻力的半经验公式,并通过已建成的润扬长江公路大桥现场试验验证其正确性。现场试验表明,所提出的半经验公式应用于实际工程中的可信度较高。To study the calculation method for the resistance produced by dry air flowing in main cable of suspension bridge, two main cable models, each having a length of 6 m and a diameter respectively of 1/2 and 1/4 of that of the main cable of Taizhou Changjiang River Highway Bridge, are selected and the tests for the air flowing resistance in the main cable are made. The Origin software is used to fit the pressure of the air flowing through the cable models under different flowing rates into straight lines and the slope ratio of an obtained straight line is the unit frictional resistance. On the basis of the testing data, the local resistance of the air flowing under different flowing rates in the air inlets, cable clamps and air outlets of the models is calculated. The regression method is then used to establish the semi-empirical formulae for the different resistance and the correctness of the formulae is verified by the field tests of the completed Runyang Changjiang River Highway Bridge. The results of the field tests show that the confidence of applying the proposed semi-empirical formulae to the practical bridge projects is great.

关 键 词：悬索桥 主缆 除湿系统 模型试验 空气流动阻力 参数 半经验公式 

分 类 号：U445.73[建筑科学—桥梁与隧道工程]