本文選題：斜拉索 + 現(xiàn)場觀測�。� 參考：《湖南科技大學》2015年碩士論文

【摘要】：斜拉橋拉索具有柔度大、質(zhì)量輕、阻尼小、固有頻率低等特點,在風、風雨組合、交通荷載等環(huán)境激勵下,拉索很容易產(chǎn)生多種形式的大幅振動,對拉索造成不利的影響,其中以拉索風雨激振危害最為嚴重。拉索的風雨激振問題極為復雜,其機理仍存在許多問題。近幾十年來,拉索的風雨激振問題一直是研究的難點與熱點。為了研究拉索風雨激振的參數(shù)特性,本文以湖南省岳陽洞庭湖大橋斜拉索風雨激振現(xiàn)場觀測試驗采集的數(shù)據(jù)為依據(jù),通過對有效數(shù)據(jù)的統(tǒng)計處理,得到了一些對認識拉索振動機理及拉索振動控制具有意義的結(jié)果。本文主要研究內(nèi)容如下:(1)簡述了斜拉橋拉索振動的問題以及危害性,概述了常見的拉索風致振動形式,總結(jié)了拉索風雨激振的研究現(xiàn)狀。(2)概述了洞庭湖大橋拉索風雨激振現(xiàn)象監(jiān)測研究的背景和內(nèi)容,介紹了拉索風雨激振觀測系統(tǒng)和數(shù)據(jù)樣本預處理方法,得到了調(diào)整后的拉索風雨激振參數(shù)時程記錄圖。(3)對龐大的數(shù)據(jù)樣本進行了統(tǒng)計處理,研究了洞庭湖大橋拉索風雨激振時主要參數(shù)風速、風向及雨量與拉索振動加速度之間參數(shù)的關(guān)系,以及參數(shù)的響應(yīng)特征。(4)針對洞庭湖大橋拉索風雨激振中在不同時間間隔下拉索的平均凈負阻尼比的問題,采用模態(tài)分解擬合出的各模態(tài)加速度分量幅值,并采用統(tǒng)計理論獲得了相應(yīng)的平均凈負阻尼比概率分布模型。(5)采用Copula函數(shù)理論,針對洞庭湖大橋風雨激振中風速、風向和雨量的Copula二維/三維聯(lián)合分布模型進行了研究,得到了三變量四維切片的三維聯(lián)合不超越概率圖和超越概率圖。
[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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3

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