紊流风速场的数值模拟及桥梁风振响应分析
发布时间：2019-04-11 19:02
【摘要】：摘要： 建于大风区的铁路桥梁受到风荷载的作用会受到很大的激振,对其进行研究是保证结构安全及桥上车辆运行安全的重要前提。本文以兰新第二双线铁路为工程背景,对风区桥梁的紊流风速场进行了数值模拟,并计算了桥梁的风振响应。全文的主要内容及成果如下： (1)对国内外桥梁的风振破坏进行了回顾,阐明了桥梁风致振动原理,介绍了研究强风作用下桥梁动力响应的重要性。并以兰新线为工程背景,重点介绍了兰新线所受风灾情况。 (2)基于随机过程分析理论,介绍了两种紊流风速场的数值模拟方法：线性滤波法和谐波合成法。 (3)基于兰新第二双线铁路风区跨度32m简支箱梁和16m简支槽型梁的设计,对其进行有限元建模,分析了结构的自振特性。 (4)采用谐波合成法对桥址处的紊流风速场进行数值模拟,根据风洞试验得到的三分力系数结果,生成桥梁各节点的静风力和抖振风力。 (5)多工况计算分析了风荷载作用下桥梁的动力响应,得到了一些有意义的结论。
[Abstract]:Abstract: the railway bridge built in the windy area will be greatly excited by wind load, so the research on it is an important prerequisite to ensure the safety of the structure and the running safety of the vehicle on the bridge. In this paper, the turbulent wind velocity field of the bridge in the wind region is numerically simulated and the wind-induced vibration response of the bridge is calculated based on the engineering background of the second double-track railway in Lanxin. The main contents and achievements of this paper are as follows: (1) the wind-induced vibration of bridges at home and abroad is reviewed, the principle of wind-induced vibration of bridges is expounded, and the importance of studying the dynamic response of bridges under strong wind is introduced. Taking Lanxin Line as the engineering background, the wind disaster situation of Lanxin Line is introduced emphatically. (2) based on the theory of stochastic process analysis, two numerical simulation methods of turbulent wind velocity field are introduced: linear filtering method and harmonic synthesis method. (3) based on the design of 32m simply supported box girder and 16m simply supported slot beam in the wind zone of Lanxin second double-track railway, the finite element modeling is carried out and the natural vibration characteristics of the structure are analyzed. (4) numerical simulation of turbulent wind velocity field at bridge site is carried out by harmonic synthesis method. According to the results of wind tunnel test, static and chattering wind forces of each node of bridge are generated. (5) the dynamic response of the bridge under wind load is calculated and analyzed under multi-conditions, and some meaningful conclusions are obtained.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2456668
[Abstract]:Abstract: the railway bridge built in the windy area will be greatly excited by wind load, so the research on it is an important prerequisite to ensure the safety of the structure and the running safety of the vehicle on the bridge. In this paper, the turbulent wind velocity field of the bridge in the wind region is numerically simulated and the wind-induced vibration response of the bridge is calculated based on the engineering background of the second double-track railway in Lanxin. The main contents and achievements of this paper are as follows: (1) the wind-induced vibration of bridges at home and abroad is reviewed, the principle of wind-induced vibration of bridges is expounded, and the importance of studying the dynamic response of bridges under strong wind is introduced. Taking Lanxin Line as the engineering background, the wind disaster situation of Lanxin Line is introduced emphatically. (2) based on the theory of stochastic process analysis, two numerical simulation methods of turbulent wind velocity field are introduced: linear filtering method and harmonic synthesis method. (3) based on the design of 32m simply supported box girder and 16m simply supported slot beam in the wind zone of Lanxin second double-track railway, the finite element modeling is carried out and the natural vibration characteristics of the structure are analyzed. (4) numerical simulation of turbulent wind velocity field at bridge site is carried out by harmonic synthesis method. According to the results of wind tunnel test, static and chattering wind forces of each node of bridge are generated. (5) the dynamic response of the bridge under wind load is calculated and analyzed under multi-conditions, and some meaningful conclusions are obtained.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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