洞庭湖大桥拉索风雨激振参数特性分析

发布时间：2018-04-17 01:30

本文选题：斜拉索 + 现场观测　；参考：《湖南科技大学》2015年硕士论文

【摘要】：斜拉桥拉索具有柔度大、质量轻、阻尼小、固有频率低等特点,在风、风雨组合、交通荷载等环境激励下,拉索很容易产生多种形式的大幅振动,对拉索造成不利的影响,其中以拉索风雨激振危害最为严重。拉索的风雨激振问题极为复杂,其机理仍存在许多问题。近几十年来,拉索的风雨激振问题一直是研究的难点与热点。为了研究拉索风雨激振的参数特性,本文以湖南省岳阳洞庭湖大桥斜拉索风雨激振现场观测试验采集的数据为依据,通过对有效数据的统计处理,得到了一些对认识拉索振动机理及拉索振动控制具有意义的结果。本文主要研究内容如下:(1)简述了斜拉桥拉索振动的问题以及危害性,概述了常见的拉索风致振动形式,总结了拉索风雨激振的研究现状。(2)概述了洞庭湖大桥拉索风雨激振现象监测研究的背景和内容,介绍了拉索风雨激振观测系统和数据样本预处理方法,得到了调整后的拉索风雨激振参数时程记录图。(3)对庞大的数据样本进行了统计处理,研究了洞庭湖大桥拉索风雨激振时主要参数风速、风向及雨量与拉索振动加速度之间参数的关系,以及参数的响应特征。(4)针对洞庭湖大桥拉索风雨激振中在不同时间间隔下拉索的平均净负阻尼比的问题,采用模态分解拟合出的各模态加速度分量幅值,并采用统计理论获得了相应的平均净负阻尼比概率分布模型。(5)采用Copula函数理论,针对洞庭湖大桥风雨激振中风速、风向和雨量的Copula二维/三维联合分布模型进行了研究,得到了三变量四维切片的三维联合不超越概率图和超越概率图。
[Abstract]:The cable of cable-stayed bridge has the characteristics of large flexibility, light weight, small damping, low natural frequency and so on. Under the environment excitation of wind, wind and rain combination, traffic load and so on, the cable can easily produce a variety of large vibration, which will have a negative effect on the cable.Among them, the wind and rain vibration of cable is the most serious.The problem of wind-induced vibration of cables is very complicated, and there are still many problems in its mechanism.In recent decades, the problem of wind-induced vibration of cables has been a difficult and hot point.In order to study the parameter characteristics of wind and rain induced vibration of cables, based on the data collected from the field observation test of wind and rain induced vibration of stayed cables of Dongting Lake Bridge in Yueyang, Hunan Province, the effective data are statistically processed.Some significant results are obtained for the understanding of cable vibration mechanism and cable vibration control.The main contents of this paper are as follows: (1) the problems and harmfulness of cable vibration of cable-stayed bridge are briefly described, and the common wind-induced vibration forms of cable are summarized.This paper summarizes the research status of wind and rain induced vibration of cables. (2) it summarizes the background and content of monitoring and studying the phenomenon of wind and rain vibration of cables in Dongting Lake Bridge, and introduces the observation system of wind and rain vibration of cables and the pretreatment method of data samples.The adjusted time-history chart of wind and rain induced vibration parameters of cables is obtained. (3) the large data samples are statistically processed, and the wind speed of main parameters in the wind and rain induced vibration of cables of Dongting Lake Bridge is studied.The relationship between wind direction, rainfall and the vibration acceleration of cables, and the response characteristics of the parameters. 4) aiming at the problem of the average net negative damping ratio of the cables in the wind and rain induced vibration of the cables of Dongting Lake Bridge at different time intervals.The amplitudes of each modal acceleration component are fitted by modal decomposition, and the corresponding probability distribution model of average net negative damping ratio is obtained by using statistical theory. The Copula function theory is used to study the wind speed in wind-induced vibration of Dongting Lake Bridge.The Copula 2D / 3D joint distribution model of wind direction and rainfall is studied, and the three dimensional untranscendence probability map and the transcendental probability diagram of three variable four dimensional slice are obtained.
【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】：U441.3

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