台风特征参数及风雨联合概率模型研究

发布时间：2018-08-21 07:46

【摘要】：随着建筑结构的细长化和轻柔化,风荷载成为了大跨度高耸、柔性结构的重要动荷载之一,而动力风荷载的确定是很复杂和困难的。在确定风荷载对结构的影响前,首先必须了解当前结构所处风场的基本特性,为了准确研究桥梁风载特性,根据建造在台风登陆区域的琼州海峡大桥南岸桥址观测站的实时观测,获取了2012年-2014年登陆琼州海峡10余次台风的风速时程。对基本的风参数进行了详细分析,并用数理统计的方法建立了相关的概率模型,为今后桥梁的设计运营提供参考。研究内容和成果包括:(1)对风工程的现场实测研究的发展历史及其取得的成果做了简要回顾,介绍了风致振动控制的机理和研究现状,并对风雨联合概率模型的研究必要性及研究方法做了简要介绍。(2)台风特性观测,介绍了本文为台风特性观测所用的仪器和对实际台风过程的观测情况。(3)详细介绍了强台风“威马逊”登陆过程的风参数变化,然后分别分析了不同风参数随时间变化的相关性和不同地貌条件下风参数之间的相关性研究。(4)将10次台风观测数据进行统计分析,建立了各个风参数的概率分布模型并给出了其数学表达式,对不同风参数之间进行了相关性分析,得到了一些定性的结论。(5)以琼州海峡大桥桥址处风速、雨量实测数据为基础,研究了基于Copula函数的理论方法构建的风速和对应雨量的风雨联合概率分布模型,并对联合重现期和同现重现期进行了预测为将来的工程设计提供参考。
[Abstract]:With the tenderness and softness of the building structure, the wind load becomes one of the important dynamic loads of the large span towering and flexible structures, and the determination of the dynamic wind load is very complicated and difficult. Before determining the influence of wind load on the structure, it is necessary to understand the basic characteristics of the wind field in the current structure, in order to study the wind load characteristics of the bridge accurately. Based on the real time observation of the south bank of Qiongzhou Strait Bridge built in the typhoon landing area, the wind speed time history of more than 10 typhoons landing in the Qiongzhou Strait from 2012 to 2014 was obtained. The basic wind parameters are analyzed in detail, and the related probability model is established by mathematical statistics, which provides a reference for the design and operation of bridges in the future. The research contents and achievements are as follows: (1) A brief review of the development history and achievements of the field measurement of wind engineering is made, and the mechanism and research status of wind-induced vibration control are introduced. The necessity and method of research on the combined probability model of wind and rain are briefly introduced. (2) observation of typhoon characteristics, This paper introduces the instruments used for the observation of typhoon characteristics and the observation of the actual typhoon process. (3) the variation of wind parameters in the landing process of strong typhoon "Wilmson" is introduced in detail. Then, the correlation of different wind parameters with time and the correlation between wind parameters under different geomorphological conditions are analyzed respectively. (4) the observed data of 10 typhoons are statistically analyzed. The probability distribution model of each wind parameter is established and its mathematical expression is given. The correlation analysis between different wind parameters is carried out, and some qualitative conclusions are obtained. (5) based on the measured data of wind speed and rainfall at the bridge site of Qiongzhou Strait Bridge, The combined probability distribution model of wind speed and rain corresponding to rainfall is studied based on the theory and method of Copula function, and the prediction of joint recurrence period and co-occurrence recurrence period is provided as a reference for future engineering design.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442

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