鄂东长江公路大桥设计风速推算研究
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摘要
利用黄石气象站年最大风速资料,在均一性检验基础上,利用极值Ⅰ型分布曲线,推算出气象站处基本风速,结合桥位处一年完整的对比观测,通过比值法把基本风速推算到设计风速。结果表明:(1)黄石气象站年最大风速在1990年前后突然减小,可能与周边建筑物增加以及全球气候变暖共同作用有关;(2)黄石气象站不同重现期(100、50、30、10 a)10 m高处10 m in平均年最大风速(基本风速)分别为25.1、23.3、22.0、19.1m/s;(3)确认气象站到桥位的风速放大系数为1.2;(4)桥位区不同重现期(100、50、30、10 a)10m高处10 m in平均年最大风速(设计风速)分别为30.1、28.0、26.4、22.9 m/s。
Using the annual maximum 10 min averaged wind speed observation of Huangshi weather stations from 1956 to 2000,it is found that the series of yearly maximum wind speed has an abrupt change around 1990.Taking project safety and national standards into account,choosing the yearly maximum wind speed of Huangshi weather stations from 1956 to 1989 and using the function of extreme value type I to calculate the yearly maximum 10 min averaged wind speed at the height of 10 m above surface at the station for different return periods(100,50,30,10 a),the results are 25.1 m/s,23.3 m/s,22.0 m/s and 19.1 m/s respectively.The enlarging coefficient of wind speed from the station to the bridge area is 1.2,which is calculated by using ratio method.And then the yearly maximum 10 min averaged wind speed at the bridge area at the height of 10 m above surface for different return periods(100,50,30,10 a) are further calculated as 30.1 m/s,28.0 m/s,26.4 m/s and 22.9 m/s respectively.
Using the annual maximum 10 min averaged wind speed observation of Huangshi weather stations from 1956 to 2000,it is found that the series of yearly maximum wind speed has an abrupt change around 1990.Taking project safety and national standards into account,choosing the yearly maximum wind speed of Huangshi weather stations from 1956 to 1989 and using the function of extreme value type I to calculate the yearly maximum 10 min averaged wind speed at the height of 10 m above surface at the station for different return periods(100,50,30,10 a),the results are 25.1 m/s,23.3 m/s,22.0 m/s and 19.1 m/s respectively.The enlarging coefficient of wind speed from the station to the bridge area is 1.2,which is calculated by using ratio method.And then the yearly maximum 10 min averaged wind speed at the bridge area at the height of 10 m above surface for different return periods(100,50,30,10 a) are further calculated as 30.1 m/s,28.0 m/s,26.4 m/s and 22.9 m/s respectively.
引文
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[2]《公路桥梁抗风设计指南》编写组.公路桥梁抗风设计指南.北京:人民交通出版社,1996.
[3]中国建筑科学研究院,等.中华人民共和国国家标准:建筑结构荷载规范(GBJ50009——2002).北京:中国建筑工业出版社,2002.
[4]马开玉,丁裕国,屠其璞,等.气候统计原理与方法.北京:气象出版社,1993.
[5]张忠义,刘聪,居为明.南京长江第二大桥桥位风速观测及设计风速的计算.气象科学,2000,20(2):200-205.
[6]周晓兰,高庆九,邓自旺,等.江苏气温长期变化趋势及年代际变化空间差异分析.南京气象学院学报,2006,29(2):196-202.
[7]田红,江双五,鲁俊.江淮流域年降水量和温度的均一性检验.气象科学,2008,28(2):228-231
[8]鞠晓慧,屠其璞,李庆祥.我国太阳总辐射月总量资料的均一性检验及订正.南京气象学院学报,2006,29(3):336-341.
[9]王艳姣,周晓兰,倪绍祥,等.近40 a来青海湖地区的气候变化分析.南京气象学院学报,2003,26(2):228-235.
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