【摘要】：隨著我國(guó)交通基礎(chǔ)設(shè)施的進(jìn)一步發(fā)展,跨海灣、跨山區(qū)峽谷大跨橋梁將逐漸成為今后若干時(shí)期內(nèi)大跨橋梁建設(shè)的重點(diǎn)。復(fù)雜山區(qū)地形大跨橋梁抗風(fēng)設(shè)計(jì)具有風(fēng)特性復(fù)雜、山區(qū)風(fēng)對(duì)大跨橋梁作用效應(yīng)復(fù)雜等特點(diǎn),目前是橋梁風(fēng)工程領(lǐng)域的研究的重點(diǎn)問題之一。本文以在建的湖南郴州赤石特大橋?yàn)楣こ桃劳?針對(duì)復(fù)雜山區(qū)地形風(fēng)場(chǎng)特性以及高墩多塔斜拉橋的風(fēng)振響應(yīng)進(jìn)行實(shí)測(cè)研究。得到了復(fù)雜山區(qū)地形主要風(fēng)特性參數(shù),包括平均風(fēng)速、風(fēng)向和風(fēng)攻角,湍流度、陣風(fēng)因子、湍流積分尺度和脈動(dòng)風(fēng)功率譜等;同時(shí)對(duì)大風(fēng)時(shí)段結(jié)構(gòu)風(fēng)振響應(yīng)情況進(jìn)行研究,得到了結(jié)構(gòu)加速度響應(yīng)均方根與平均風(fēng)速的關(guān)系,以及結(jié)構(gòu)自振頻率和阻尼比,并與結(jié)構(gòu)有限元結(jié)果進(jìn)行了比較。本文主要工作如下:(1)簡(jiǎn)要介紹了國(guó)內(nèi)外風(fēng)場(chǎng)實(shí)測(cè)和風(fēng)振響應(yīng)實(shí)測(cè)的研究現(xiàn)狀,并提出了本文的研究?jī)?nèi)容。(2)擬定了赤石大橋橋位風(fēng)特性實(shí)測(cè)與結(jié)構(gòu)風(fēng)振響應(yīng)實(shí)測(cè)方案,并對(duì)實(shí)測(cè)系統(tǒng)進(jìn)行了詳細(xì)的介紹,最后給出了現(xiàn)場(chǎng)安裝情況。(3)基于MATLAB軟件編寫數(shù)據(jù)處理程序,分析了赤石大橋橋位處風(fēng)場(chǎng)特性�；陂L(zhǎng)期實(shí)測(cè)數(shù)據(jù),首先得到了塔頂和橋面高度處的平均風(fēng)速、風(fēng)向和風(fēng)攻角,分析了風(fēng)向和風(fēng)攻角的分布規(guī)律。然后統(tǒng)計(jì)得到了大風(fēng)時(shí)段的脈動(dòng)風(fēng)特性,包括湍流度、陣風(fēng)因子、湍流積分尺度和脈動(dòng)風(fēng)功率譜等風(fēng)特性參數(shù)。給出了湍流度與陣風(fēng)因子的關(guān)系以及實(shí)測(cè)脈動(dòng)風(fēng)功率譜。(4)基于加速度響應(yīng)實(shí)測(cè)數(shù)據(jù)分析了結(jié)構(gòu)的風(fēng)振響應(yīng)。首先是針對(duì)原始數(shù)據(jù)進(jìn)行預(yù)處理,包括剔除野值、去趨勢(shì)和濾波等。然后以10min為時(shí)距求出加速度響應(yīng)均方根值,分析其與平均風(fēng)速的關(guān)系。最后利用隨機(jī)減量法和模態(tài)時(shí)域識(shí)別法分析結(jié)構(gòu)動(dòng)力特性,包括自振頻率和阻尼比,并與結(jié)構(gòu)有限元分析結(jié)果進(jìn)行了比較。
[Abstract]:With the further development of the transportation infrastructure in our country, the long-span bridge across the gulf and mountain canyon will gradually become the focal point of the construction of the long-span bridge in the future. The wind-resistant design of long-span bridges in complex mountainous areas is characterized by complex wind characteristics and complex effects of wind on long-span bridges. At present, it is one of the key issues in the field of bridge wind engineering. Based on the Chenzhou Chishi Bridge under construction in Hunan Province, the wind field characteristics of the complex mountainous terrain and the wind-induced vibration response of the multi-tower cable-stayed bridge with high piers are studied in this paper. The main wind characteristic parameters of complex mountain terrain are obtained, including mean wind speed, wind direction and wind attack angle, turbulence degree, gust factor, turbulence integral scale and pulsating wind power spectrum, etc. At the same time, the wind-induced response of structure is studied. The relationship between the root mean square of the structural acceleration response and the average wind speed, the natural vibration frequency and damping ratio of the structure are obtained, and the results are compared with the finite element results of the structure. The main work of this paper is as follows: (1) the research status of wind field and wind vibration response at home and abroad is briefly introduced, and the research contents of this paper are put forward. Finally, the field installation is given. (3) based on MATLAB software, the data processing program is compiled to analyze the wind field characteristics at the bridge location of the Chishi Bridge. Based on the measured data for a long time, the average wind speed, wind direction and wind attack angle at the top of the tower and the height of the bridge deck are obtained, and the distribution of wind direction and attack angle is analyzed. Then, the characteristics of pulsating wind in gale period, including turbulence degree, gust factor, turbulence integral scale and pulsating wind power spectrum, are obtained statistically. The relation between turbulence degree and gust factor and the measured pulsating wind power spectrum are given. (4) based on the measured data of acceleration response, the wind-induced vibration response of the structure is analyzed. The first step is to preprocess the raw data, including eliminating outliers, de-trend and filtering, etc. Then, the root mean square value of acceleration response is obtained by 10min distance, and the relationship between the RMS value and the average wind speed is analyzed. Finally, the dynamic characteristics of the structure, including the natural frequency and damping ratio, are analyzed by using the stochastic decrement method and the modal time domain identification method, and the results are compared with the results of the finite element analysis of the structure.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3;U448.27

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 胡俊;歐進(jìn)萍;;某大跨懸索橋風(fēng)振響應(yīng)現(xiàn)場(chǎng)實(shí)測(cè)與理論對(duì)比分析[J];振動(dòng)與沖擊;2013年11期

2 周廣東;丁幼亮;李愛群;鄧揚(yáng);;基于潤(rùn)揚(yáng)大橋南塔頂長(zhǎng)期監(jiān)測(cè)數(shù)據(jù)風(fēng)場(chǎng)特性分析[J];工程力學(xué);2012年07期

3 ;Long-term field measurement and analysis of the natural wind characteristics at the site of Xi-hou-men Bridge[J];Journal of Zhejiang University-Science A(Applied Physics & Engineering);2012年03期

4 盧元磊;何佳洲;安瑾;苗高潔;;幾種野值剔除準(zhǔn)則在目標(biāo)預(yù)測(cè)中的應(yīng)用研究[J];指揮控制與仿真;2011年04期

5 徐洪濤;何勇;廖海黎;馬存明;鮮榮;;山區(qū)峽谷大跨度橋梁橋址風(fēng)場(chǎng)試驗(yàn)[J];公路交通科技;2011年07期

6 賴素建;靳曉雄;彭為;何劍峰;;信號(hào)預(yù)處理中錯(cuò)點(diǎn)剔除方法的研究[J];佳木斯大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年03期

7 王浩;李愛群;謝靜;焦�？�;;臺(tái)風(fēng)作用下超大跨度斜拉橋抖振響應(yīng)現(xiàn)場(chǎng)實(shí)測(cè)研究[J];土木工程學(xué)報(bào);2010年07期

8 龐加斌;宋錦忠;林志興;;四渡河峽谷大橋橋位風(fēng)的湍流特性實(shí)測(cè)分析[J];中國(guó)公路學(xué)報(bào);2010年03期

9 李永樂;唐康;蔡憲棠;廖海黎;;深切峽谷區(qū)大跨度橋梁的復(fù)合風(fēng)速標(biāo)準(zhǔn)[J];西南交通大學(xué)學(xué)報(bào);2010年02期

10 周志勇;肖亮;丁泉順;姜保宋;;大范圍區(qū)域復(fù)雜地形風(fēng)場(chǎng)數(shù)值模擬研究[J];力學(xué)季刊;2010年01期

相關(guān)碩士學(xué)位論文 前2條

1 李海龍;環(huán)境激勵(lì)下結(jié)構(gòu)模態(tài)參數(shù)識(shí)別方法研究[D];重慶大學(xué);2012年

2 張高良;山區(qū)強(qiáng)風(fēng)特性觀測(cè)及風(fēng)洞試驗(yàn)?zāi)M研究[D];長(zhǎng)安大學(xué);2011年

，

本文編號(hào)：2267434